vic
533 Commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
jianzhou
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78360542aa |
Merge android-4.9.180 (719bdd9) into msm-4.9
* refs/heads/tmp-719bdd9: Linux 4.9.180 drm: Wake up next in drm_read() chain if we are forced to putback the event ASoC: davinci-mcasp: Fix clang warning without CONFIG_PM spi: Fix zero length xfer bug spi: rspi: Fix sequencer reset during initialization spi : spi-topcliff-pch: Fix to handle empty DMA buffers scsi: lpfc: Fix SLI3 commands being issued on SLI4 devices media: saa7146: avoid high stack usage with clang scsi: lpfc: Fix FDMI manufacturer attribute value media: go7007: avoid clang frame overflow warning with KASAN media: m88ds3103: serialize reset messages in m88ds3103_set_frontend dmaengine: tegra210-adma: use devm_clk_*() helpers scsi: qla4xxx: avoid freeing unallocated dma memory usb: core: Add PM runtime calls to usb_hcd_platform_shutdown rcuperf: Fix cleanup path for invalid perf_type strings rcutorture: Fix cleanup path for invalid torture_type strings x86/mce: Fix machine_check_poll() tests for error types tty: ipwireless: fix missing checks for ioremap virtio_console: initialize vtermno value for ports media: wl128x: prevent two potential buffer overflows spi: tegra114: reset controller on probe cxgb3/l2t: Fix undefined behaviour ASoC: fsl_utils: fix a leaked reference by adding missing of_node_put ASoC: eukrea-tlv320: fix a leaked reference by adding missing of_node_put HID: core: move Usage Page concatenation to Main item chardev: add additional check for minor range overlap x86/ia32: Fix ia32_restore_sigcontext() AC leak x86/uaccess, signal: Fix AC=1 bloat arm64: cpu_ops: fix a leaked reference by adding missing of_node_put scsi: ufs: Avoid configuring regulator with undefined voltage range scsi: ufs: Fix regulator load and icc-level configuration brcmfmac: fix Oops when bringing up interface during USB disconnect brcmfmac: fix race during disconnect when USB completion is in progress brcmfmac: convert dev_init_lock mutex to completion b43: shut up clang -Wuninitialized variable warning brcmfmac: fix missing checks for kmemdup mwifiex: Fix mem leak in mwifiex_tm_cmd rtlwifi: fix a potential NULL pointer dereference iio: common: ssp_sensors: Initialize calculated_time in ssp_common_process_data iio: hmc5843: fix potential NULL pointer dereferences iio: ad_sigma_delta: Properly handle SPI bus locking vs CS assertion x86/build: Keep local relocations with ld.lld cpufreq: pmac32: fix possible object reference leak cpufreq/pasemi: fix possible object reference leak cpufreq: ppc_cbe: fix possible object reference leak s390: cio: fix cio_irb declaration extcon: arizona: Disable mic detect if running when driver is removed PM / core: Propagate dev->power.wakeup_path when no callbacks mmc: sdhci-of-esdhc: add erratum eSDHC-A001 and A-008358 support mmc: sdhci-of-esdhc: add erratum eSDHC5 support mmc_spi: add a status check for spi_sync_locked mmc: core: make pwrseq_emmc (partially) support sleepy GPIO controllers scsi: libsas: Do discovery on empty PHY to update PHY info hwmon: (f71805f) Use request_muxed_region for Super-IO accesses hwmon: (pc87427) Use request_muxed_region for Super-IO accesses hwmon: (smsc47b397) Use request_muxed_region for Super-IO accesses hwmon: (smsc47m1) Use request_muxed_region for Super-IO accesses hwmon: (vt1211) Use request_muxed_region for Super-IO accesses RDMA/cxgb4: Fix null pointer dereference on alloc_skb failure arm64: vdso: Fix clock_getres() for CLOCK_REALTIME i40e: don't allow changes to HW VLAN stripping on active port VLANs x86/irq/64: Limit IST stack overflow check to #DB stack USB: core: Don't unbind interfaces following device reset failure sched/core: Handle overflow in cpu_shares_write_u64 sched/core: Check quota and period overflow at usec to nsec conversion powerpc/numa: improve control of topology updates media: pvrusb2: Prevent a buffer overflow media: au0828: Fix NULL pointer dereference in au0828_analog_stream_enable() audit: fix a memory leak bug media: ov2659: make S_FMT succeed even if requested format doesn't match media: au0828: stop video streaming only when last user stops media: ov6650: Move v4l2_clk_get() to ov6650_video_probe() helper media: coda: clear error return value before picture run dmaengine: at_xdmac: remove BUG_ON macro in tasklet pinctrl: pistachio: fix leaked of_node references HID: logitech-hidpp: use RAP instead of FAP to get the protocol version mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions x86/mm: Remove in_nmi() warning from 64-bit implementation of vmalloc_fault() smpboot: Place the __percpu annotation correctly x86/build: Move _etext to actual end of .text bcache: avoid clang -Wunintialized warning bcache: add failure check to run_cache_set() for journal replay bcache: fix failure in journal relplay bcache: return error immediately in bch_journal_replay() crypto: sun4i-ss - Fix invalid calculation of hash end net: cw1200: fix a NULL pointer dereference mwifiex: prevent an array overflow ASoC: fsl_sai: Update is_slave_mode with correct value mac80211/cfg80211: update bss channel on channel switch dmaengine: pl330: _stop: clear interrupt status w1: fix the resume command API rtc: 88pm860x: prevent use-after-free on device remove iwlwifi: pcie: don't crash on invalid RX interrupt scsi: qla2xxx: Fix a qla24xx_enable_msix() error path sched/cpufreq: Fix kobject memleak arm64: Fix compiler warning from pte_unmap() with -Wunused-but-set-variable ARM: vdso: Remove dependency with the arch_timer driver internals brcm80211: potential NULL dereference in brcmf_cfg80211_vndr_cmds_dcmd_handler() spi: pxa2xx: fix SCR (divisor) calculation ASoC: imx: fix fiq dependencies powerpc/boot: Fix missing check of lseek() return value ASoC: hdmi-codec: unlock the device on startup errors net: ena: gcc 8: fix compilation warning dmaengine: tegra210-dma: free dma controller in remove() mmc: core: Verify SD bus width cxgb4: Fix error path in cxgb4_init_module gfs2: Fix lru_count going negative Revert "btrfs: Honour FITRIM range constraints during free space trim" tools include: Adopt linux/bits.h perf tools: No need to include bitops.h in util.h at76c50x-usb: Don't register led_trigger if usb_register_driver failed ssb: Fix possible NULL pointer dereference in ssb_host_pcmcia_exit media: vivid: use vfree() instead of kfree() for dev->bitmap_cap media: cpia2: Fix use-after-free in cpia2_exit fbdev: fix WARNING in __alloc_pages_nodemask bug hugetlb: use same fault hash key for shared and private mappings fbdev: fix divide error in fb_var_to_videomode btrfs: sysfs: don't leak memory when failing add fsid Btrfs: fix race between ranged fsync and writeback of adjacent ranges Btrfs: do not abort transaction at btrfs_update_root() after failure to COW path gfs2: Fix sign extension bug in gfs2_update_stats arm64: Save and restore OSDLR_EL1 across suspend/resume libnvdimm/namespace: Fix label tracking error kvm: svm/avic: fix off-by-one in checking host APIC ID crypto: vmx - CTR: always increment IV as quadword Revert "scsi: sd: Keep disk read-only when re-reading partition" bio: fix improper use of smp_mb__before_atomic() KVM: x86: fix return value for reserved EFER ext4: do not delete unlinked inode from orphan list on failed truncate f2fs: link f2fs quota ops for sysfile Change-Id: Ief4e371f7f2377222f54fea237408c8bd5dda548 Signed-off-by: jianzhou <jianzhou@codeaurora.org> |
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Paul E. McKenney
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090eb578b9 |
rcuperf: Fix cleanup path for invalid perf_type strings
[ Upstream commit ad092c027713a68a34168942a5ef422e42e039f4 ] If the specified rcuperf.perf_type is not in the rcu_perf_init() function's perf_ops[] array, rcuperf prints some console messages and then invokes rcu_perf_cleanup() to set state so that a future torture test can run. However, rcu_perf_cleanup() also attempts to end the test that didn't actually start, and in doing so relies on the value of cur_ops, a value that is not particularly relevant in this case. This can result in confusing output or even follow-on failures due to attempts to use facilities that have not been properly initialized. This commit therefore sets the value of cur_ops to NULL in this case and inserts a check near the beginning of rcu_perf_cleanup(), thus avoiding relying on an irrelevant cur_ops value. Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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Paul E. McKenney
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0b447e75c2 |
rcutorture: Fix cleanup path for invalid torture_type strings
[ Upstream commit b813afae7ab6a5e91b4e16cc567331d9c2ae1f04 ] If the specified rcutorture.torture_type is not in the rcu_torture_init() function's torture_ops[] array, rcutorture prints some console messages and then invokes rcu_torture_cleanup() to set state so that a future torture test can run. However, rcu_torture_cleanup() also attempts to end the test that didn't actually start, and in doing so relies on the value of cur_ops, a value that is not particularly relevant in this case. This can result in confusing output or even follow-on failures due to attempts to use facilities that have not been properly initialized. This commit therefore sets the value of cur_ops to NULL in this case and inserts a check near the beginning of rcu_torture_cleanup(), thus avoiding relying on an irrelevant cur_ops value. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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jianzhou
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b82a5df2dc |
Merge android-4.9.165 (72b54df) into msm-4.9
* refs/heads/tmp-72b54df: Linux 4.9.165 KVM: X86: Fix residual mmio emulation request to userspace KVM: nVMX: Ignore limit checks on VMX instructions using flat segments KVM: nVMX: Sign extend displacements of VMX instr's mem operands drm/radeon/evergreen_cs: fix missing break in switch statement media: uvcvideo: Avoid NULL pointer dereference at the end of streaming rcu: Do RCU GP kthread self-wakeup from softirq and interrupt md: Fix failed allocation of md_register_thread perf intel-pt: Fix divide by zero when TSC is not available perf intel-pt: Fix overlap calculation for padding perf auxtrace: Define auxtrace record alignment perf intel-pt: Fix CYC timestamp calculation after OVF bcache: never writeback a discard operation PM / wakeup: Rework wakeup source timer cancellation nfsd: fix wrong check in write_v4_end_grace() nfsd: fix memory corruption caused by readdir NFS: Don't recoalesce on error in nfs_pageio_complete_mirror() NFS: Fix an I/O request leakage in nfs_do_recoalesce NFS: Fix I/O request leakages dm: fix to_sector() for 32bit ARM: s3c24xx: Fix boolean expressions in osiris_dvs_notify powerpc/ptrace: Simplify vr_get/set() to avoid GCC warning powerpc: Fix 32-bit KVM-PR lockup and host crash with MacOS guest powerpc/83xx: Also save/restore SPRG4-7 during suspend powerpc/powernv: Make opal log only readable by root powerpc/wii: properly disable use of BATs when requested. powerpc/32: Clear on-stack exception marker upon exception return jbd2: fix compile warning when using JBUFFER_TRACE jbd2: clear dirty flag when revoking a buffer from an older transaction serial: 8250_pci: Have ACCES cards that use the four port Pericom PI7C9X7954 chip use the pci_pericom_setup() serial: 8250_pci: Fix number of ports for ACCES serial cards 8250: FIX Fourth port offset of Pericom PI7C9X7954 boards serial: 8250_of: assume reg-shift of 2 for mrvl,mmp-uart serial: uartps: Fix stuck ISR if RX disabled with non-empty FIFO drm/i915: Relax mmap VMA check i2c: tegra: fix maximum transfer size parport_pc: fix find_superio io compare code, should use equal test. intel_th: Don't reference unassigned outputs device property: Fix the length used in PROPERTY_ENTRY_STRING() kernel/sysctl.c: add missing range check in do_proc_dointvec_minmax_conv mm/vmalloc: fix size check for remap_vmalloc_range_partial() mm: hwpoison: fix thp split handing in soft_offline_in_use_page() nfit: acpi_nfit_ctl(): Check out_obj->type in the right place clk: ingenic: Fix doc of ingenic_cgu_div_info clk: ingenic: Fix round_rate misbehaving with non-integer dividers clk: clk-twl6040: Fix imprecise external abort for pdmclk ext2: Fix underflow in ext2_max_size() ext4: fix crash during online resizing cpufreq: pxa2xx: remove incorrect __init annotation cpufreq: tegra124: add missing of_node_put() libertas_tf: don't set URB_ZERO_PACKET on IN USB transfer crypto: pcbc - remove bogus memcpy()s with src == dest Btrfs: fix corruption reading shared and compressed extents after hole punching btrfs: ensure that a DUP or RAID1 block group has exactly two stripes m68k: Add -ffreestanding to CFLAGS splice: don't merge into linked buffers fs/devpts: always delete dcache dentry-s in dput() scsi: target/iscsi: Avoid iscsit_release_commands_from_conn() deadlock scsi: sd: Optimal I/O size should be a multiple of physical block size scsi: virtio_scsi: don't send sc payload with tmfs s390/virtio: handle find on invalid queue gracefully clocksource/drivers/exynos_mct: Clear timer interrupt when shutdown clocksource/drivers/exynos_mct: Move one-shot check from tick clear to ISR regulator: s2mpa01: Fix step values for some LDOs regulator: s2mps11: Fix steps for buck7, buck8 and LDO35 spi: pxa2xx: Setup maximum supported DMA transfer length spi: ti-qspi: Fix mmap read when more than one CS in use ACPI / device_sysfs: Avoid OF modalias creation for removed device tracing: Do not free iter->trace in fail path of tracing_open_pipe() tracing: Use strncpy instead of memcpy for string keys in hist triggers CIFS: Fix read after write for files with read caching CIFS: Do not reset lease state to NONE on lease break crypto: arm64/aes-ccm - fix logical bug in AAD MAC handling crypto: hash - set CRYPTO_TFM_NEED_KEY if ->setkey() fails libnvdimm: Fix altmap reservation size calculation libnvdimm/pmem: Honor force_raw for legacy pmem regions libnvdimm/label: Clear 'updating' flag after label-set update stm class: Prevent division by zero tmpfs: fix uninitialized return value in shmem_link net: set static variable an initial value in atl2_probe() nfp: bpf: fix ALU32 high bits clearance bug nfp: bpf: fix code-gen bug on BPF_ALU | BPF_XOR | BPF_K net: thunderx: make CFG_DONE message to run through generic send-ack sequence mac80211_hwsim: propagate genlmsg_reply return code phonet: fix building with clang ARC: uacces: remove lp_start, lp_end from clobber list ARCv2: lib: memcpy: fix doing prefetchw outside of buffer tmpfs: fix link accounting when a tmpfile is linked in net: marvell: mvneta: fix DMA debug warning arm64: Relax GIC version check during early boot ASoC: topology: free created components in tplg load error net: mv643xx_eth: disable clk on error path in mv643xx_eth_shared_probe() qmi_wwan: apply SET_DTR quirk to Sierra WP7607 pinctrl: meson: meson8b: fix the sdxc_a data 1..3 pins net: systemport: Fix reception of BPDUs scsi: libiscsi: Fix race between iscsi_xmit_task and iscsi_complete_task assoc_array: Fix shortcut creation ARM: 8824/1: fix a migrating irq bug when hotplug cpu clk: sunxi: A31: Fix wrong AHB gate number Input: st-keyscan - fix potential zalloc NULL dereference i2c: cadence: Fix the hold bit setting net: hns: Fix object reference leaks in hns_dsaf_roce_reset() mm: page_alloc: fix ref bias in page_frag_alloc() for 1-byte allocs mm/gup: fix gup_pmd_range() for dax floppy: check_events callback should not return a negative number Input: matrix_keypad - use flush_delayed_work() Input: cap11xx - switch to using set_brightness_blocking() ARM: OMAP2+: Variable "reg" in function omap4_dsi_mux_pads() could be uninitialized s390/dasd: fix using offset into zero size array error gpu: ipu-v3: Fix CSI offsets for imx53 gpu: ipu-v3: Fix i.MX51 CSI control registers offset crypto: ahash - fix another early termination in hash walk crypto: caam - fixed handling of sg list stm class: Fix an endless loop in channel allocation iio: adc: exynos-adc: Fix NULL pointer exception on unbind ASoC: fsl_esai: fix register setting issue in RIGHT_J mode 9p/net: fix memory leak in p9_client_create 9p: use inode->i_lock to protect i_size_write() under 32-bit media: videobuf2-v4l2: drop WARN_ON in vb2_warn_zero_bytesused() FROMLIST: psi: introduce psi monitor FROMLIST: refactor header includes to allow kthread.h inclusion in psi_types.h FROMLIST: psi: track changed states FROMLIST: psi: split update_stats into parts FROMLIST: psi: rename psi fields in preparation for psi trigger addition FROMLIST: psi: make psi_enable static FROMLIST: psi: introduce state_mask to represent stalled psi states ANDROID: cuttlefish_defconfig: Enable CONFIG_PSI BACKPORT: kernel: cgroup: add poll file operation BACKPORT: fs: kernfs: add poll file operation UPSTREAM: psi: avoid divide-by-zero crash inside virtual machines UPSTREAM: psi: clarify the Kconfig text for the default-disable option UPSTREAM: psi: fix aggregation idle shut-off UPSTREAM: cgroup add cftype->open/release() callbacks UPSTREAM: kernfs: Check KERNFS_HAS_RELEASE before calling kernfs_release_file() UPSTREAM: kernfs: fix locking around kernfs_ops->release() callback UPSTREAM: kernfs: add kernfs_ops->open/release() callbacks UPSTREAM: psi: fix reference to kernel commandline enable BACKPORT: psi: make disabling/enabling easier for vendor kernels UPSTREAM: kernel/sched/psi.c: simplify cgroup_move_task() BACKPORT: psi: cgroup support UPSTREAM: psi: pressure stall information for CPU, memory, and IO BACKPORT: sched: introduce this_rq_lock_irq() BACKPORT: sched: sched.h: make rq locking and clock functions available in stats.h UPSTREAM: sched: loadavg: make calc_load_n() public UPSTREAM: sched: loadavg: consolidate LOAD_INT, LOAD_FRAC, CALC_LOAD BACKPORT: delayacct: track delays from thrashing cache pages BACKPORT: mm: workingset: tell cache transitions from workingset thrashing BACKPORT: cgroup: misc changes UPSTREAM: sched/headers: Remove <linux/sched.h> from <linux/sched/loadavg.h> UPSTREAM: sched/headers: Move loadavg related definitions from <linux/sched.h> to <linux/sched/loadavg.h> UPSTREAM: sched/headers, delayacct: Move the 'struct task_delay_info' definition from <linux/sched.h> to <linux/delayacct.h> UPSTREAM: sched/headers: Prepare for new header dependencies before moving code to <linux/sched/loadavg.h> BACKPORT: sched/core: Add wrappers for lockdep_(un)pin_lock() UPSTREAM: Avoid page waitqueue race leaving possible page locker waiting UPSTREAM: mm: add PageWaiters indicating tasks are waiting for a page bit UPSTREAM: workqueue: make workqueue available early during boot ANDROID: ion_dummy_driver: Remove SYSTEM_CONTIG heap ANDROID: ion_dummy_driver: Rework ion_dummy_driver to avoid direct indexing into the heaps ANDROID: ion_dummy_driver: Use IS_ERR_OR_NULL() before destroying heaps ANDROID: sched/fair: fix energy compute when a cluster is only a cpu core in multi-cluster system Conflicts: arch/arm/kernel/irq.c drivers/scsi/sd.c include/linux/cgroup.h include/linux/sched.h kernel/sched/Makefile kernel/sched/core.c mm/page_alloc.c Change-Id: I387345d8f6d2145e2456fbead266c897475dfb4c Signed-off-by: jianzhou <jianzhou@codeaurora.org> |
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Zhang, Jun
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3b2bbd1bfb |
rcu: Do RCU GP kthread self-wakeup from softirq and interrupt
commit 1d1f898df6586c5ea9aeaf349f13089c6fa37903 upstream.
The rcu_gp_kthread_wake() function is invoked when it might be necessary
to wake the RCU grace-period kthread. Because self-wakeups are normally
a useless waste of CPU cycles, if rcu_gp_kthread_wake() is invoked from
this kthread, it naturally refuses to do the wakeup.
Unfortunately, natural though it might be, this heuristic fails when
rcu_gp_kthread_wake() is invoked from an interrupt or softirq handler
that interrupted the grace-period kthread just after the final check of
the wait-event condition but just before the schedule() call. In this
case, a wakeup is required, even though the call to rcu_gp_kthread_wake()
is within the RCU grace-period kthread's context. Failing to provide
this wakeup can result in grace periods failing to start, which in turn
results in out-of-memory conditions.
This race window is quite narrow, but it actually did happen during real
testing. It would of course need to be fixed even if it was strictly
theoretical in nature.
This patch does not Cc stable because it does not apply cleanly to
earlier kernel versions.
Fixes:
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Blagovest Kolenichev
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40834dd03f |
Merge android-4.9.105 (859e0a8) into msm-4.9
* refs/heads/tmp-859e0a8:
Linux 4.9.105
Revert "vti4: Don't override MTU passed on link creation via IFLA_MTU"
Revert "vti4: Don't override MTU passed on link creation via IFLA_MTU"
Linux 4.9.104
kdb: make "mdr" command repeat
pinctrl: msm: Use dynamic GPIO numbering
regulator: of: Add a missing 'of_node_put()' in an error handling path of 'of_regulator_match()'
ARM: dts: porter: Fix HDMI output routing
ARM: dts: imx7d: cl-som-imx7: fix pinctrl_enet
regmap: Correct comparison in regmap_cached
netlabel: If PF_INET6, check sk_buff ip header version
selftests/net: fixes psock_fanout eBPF test case
perf report: Fix memory corruption in --branch-history mode --branch-history
perf tests: Use arch__compare_symbol_names to compare symbols
x86/apic: Set up through-local-APIC mode on the boot CPU if 'noapic' specified
drm/rockchip: Respect page offset for PRIME mmap calls
MIPS: Octeon: Fix logging messages with spurious periods after newlines
pinctrl: sh-pfc: r8a7796: Fix MOD_SEL register pin assignment for SSI pins group
rcu: Call touch_nmi_watchdog() while printing stall warnings
audit: return on memory error to avoid null pointer dereference
ARM: dts: bcm283x: Fix probing of bcm2835-i2s
udf: Provide saner default for invalid uid / gid
PCI: Add function 1 DMA alias quirk for Marvell 88SE9220
cpufreq: Reorder cpufreq_online() error code path
net: stmmac: ensure that the MSS desc is the last desc to set the own bit
net: stmmac: ensure that the device has released ownership before reading data
dmaengine: qcom: bam_dma: get num-channels and num-ees from dt
hwrng: stm32 - add reset during probe
enic: enable rq before updating rq descriptors
dmaengine: rcar-dmac: Check the done lists in rcar_dmac_chan_get_residue()
dmaengine: pl330: fix a race condition in case of threaded irqs
ALSA: vmaster: Propagate slave error
x86/devicetree: Fix device IRQ settings in DT
x86/devicetree: Initialize device tree before using it
gfs2: Fix fallocate chunk size
soc: qcom: wcnss_ctrl: Fix increment in NV upload
arm64: dts: qcom: Fix SPI5 config on MSM8996
perf/x86/intel: Fix event update for auto-reload
perf/x86/intel: Fix large period handling on Broadwell CPUs
cdrom: do not call check_disk_change() inside cdrom_open()
perf/x86/intel: Properly save/restore the PMU state in the NMI handler
hwmon: (pmbus/adm1275) Accept negative page register values
hwmon: (pmbus/max8688) Accept negative page register values
drm/panel: simple: Fix the bus format for the Ontat panel
perf/core: Fix perf_output_read_group()
f2fs: fix to check extent cache in f2fs_drop_extent_tree
powerpc: Add missing prototype for arch_irq_work_raise()
ipmi_ssif: Fix kernel panic at msg_done_handler
PCI: Restore config space on runtime resume despite being unbound
MIPS: ath79: Fix AR724X_PLL_REG_PCIE_CONFIG offset
spi: bcm-qspi: fIX some error handling paths
regulator: gpio: Fix some error handling paths in 'gpio_regulator_probe()'
IB/core: Honor port_num while resolving GID for IB link layer
perf stat: Fix core dump when flag T is used
perf top: Fix top.call-graph config option reading
KVM: lapic: stop advertising DIRECTED_EOI when in-kernel IOAPIC is in use
i2c: mv64xxx: Apply errata delay only in standard mode
cxgb4: Fix queue free path of ULD drivers
ACPICA: acpi: acpica: fix acpi operand cache leak in nseval.c
ACPICA: Events: add a return on failure from acpi_hw_register_read
bcache: quit dc->writeback_thread when BCACHE_DEV_DETACHING is set
zorro: Set up z->dev.dma_mask for the DMA API
cpufreq: cppc_cpufreq: Fix cppc_cpufreq_init() failure path
arm: dts: socfpga: fix GIC PPI warning
virtio-net: Fix operstate for virtio when no VIRTIO_NET_F_STATUS
ima: Fallback to the builtin hash algorithm
cxgb4: Setup FW queues before registering netdev
ath10k: Fix kernel panic while using worker (ath10k_sta_rc_update_wk)
net/mlx5: Protect from command bit overflow
selftests: Print the test we're running to /dev/kmsg
tools/thermal: tmon: fix for segfault
powerpc/perf: Fix kernel address leak via sampling registers
powerpc/perf: Prevent kernel address leak to userspace via BHRB buffer
hwmon: (nct6775) Fix writing pwmX_mode
parisc/pci: Switch LBA PCI bus from Hard Fail to Soft Fail mode
m68k: set dma and coherent masks for platform FEC ethernets
powerpc/mpic: Check if cpu_possible() in mpic_physmask()
ACPI: acpi_pad: Fix memory leak in power saving threads
drivers: macintosh: rack-meter: really fix bogus memsets
xen/acpi: off by one in read_acpi_id()
rxrpc: Don't treat call aborts as conn aborts
rxrpc: Fix Tx ring annotation after initial Tx failure
btrfs: fix lockdep splat in btrfs_alloc_subvolume_writers
Btrfs: fix copy_items() return value when logging an inode
btrfs: tests/qgroup: Fix wrong tree backref level
net: bgmac: Fix endian access in bgmac_dma_tx_ring_free()
sparc64: Make atomic_xchg() an inline function rather than a macro.
fscache: Fix hanging wait on page discarded by writeback
KVM: VMX: raise internal error for exception during invalid protected mode state
sched/rt: Fix rq->clock_update_flags < RQCF_ACT_SKIP warning
ocfs2/dlm: don't handle migrate lockres if already in shutdown
btrfs: Fix possible softlock on single core machines
Btrfs: fix NULL pointer dereference in log_dir_items
Btrfs: bail out on error during replay_dir_deletes
mm: fix races between address_space dereference and free in page_evicatable
mm/ksm: fix interaction with THP
dp83640: Ensure against premature access to PHY registers after reset
cpufreq: CPPC: Initialize shared perf capabilities of CPUs
Force log to disk before reading the AGF during a fstrim
sr: get/drop reference to device in revalidate and check_events
swap: divide-by-zero when zero length swap file on ssd
fs/proc/proc_sysctl.c: fix potential page fault while unregistering sysctl table
x86/mm: Do not forbid _PAGE_RW before init for __ro_after_init
x86/pgtable: Don't set huge PUD/PMD on non-leaf entries
nvme: don't send keep-alives to the discovery controller
sh: fix debug trap failure to process signals before return to user
net: mvneta: fix enable of all initialized RXQs
net: Fix untag for vlan packets without ethernet header
mm/kmemleak.c: wait for scan completion before disabling free
builddeb: Fix header package regarding dtc source links
llc: properly handle dev_queue_xmit() return value
perf/x86/intel: Fix linear IP of PEBS real_ip on Haswell and later CPUs
net: qmi_wwan: add BroadMobi BM806U 2020:2033
ARM: 8748/1: mm: Define vdso_start, vdso_end as array
batman-adv: fix packet loss for broadcasted DHCP packets to a server
batman-adv: fix multicast-via-unicast transmission with AP isolation
selftests: ftrace: Add a testcase for probepoint
selftests: ftrace: Add a testcase for string type with kprobe_event
selftests: ftrace: Add probe event argument syntax testcase
mm, thp: do not cause memcg oom for thp
mm/mempolicy.c: avoid use uninitialized preferred_node
RDMA/qedr: Fix rc initialization on CNQ allocation failure
RDMA/qedr: fix QP's ack timeout configuration
RDMA/ucma: Correct option size check using optlen
kbuild: make scripts/adjust_autoksyms.sh robust against timestamp races
brcmfmac: Fix check for ISO3166 code
perf/cgroup: Fix child event counting bug
vti4: Don't override MTU passed on link creation via IFLA_MTU
vti4: Don't count header length twice on tunnel setup
batman-adv: Fix skbuff rcsum on packet reroute
batman-adv: fix header size check in batadv_dbg_arp()
net: Fix vlan untag for bridge and vlan_dev with reorder_hdr off
drm/imx: move arming of the vblank event to atomic_flush
sunvnet: does not support GSO for sctp
ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu
workqueue: use put_device() instead of kfree()
bnxt_en: Check valid VNIC ID in bnxt_hwrm_vnic_set_tpa().
netfilter: ebtables: fix erroneous reject of last rule
dmaengine: mv_xor_v2: Fix clock resource by adding a register clock
arm64: Relax ARM_SMCCC_ARCH_WORKAROUND_1 discovery
xen: xenbus: use put_device() instead of kfree()
IB/core: Fix possible crash to access NULL netdev
net: smsc911x: Fix unload crash when link is up
net: qcom/emac: Use proper free methods during TX
fsl/fman: avoid sleeping in atomic context while adding an address
fbdev: Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper().
IB/mlx5: Fix an error code in __mlx5_ib_modify_qp()
IB/mlx4: Include GID type when deleting GIDs from HW table under RoCE
IB/mlx4: Fix corruption of RoCEv2 IPv4 GIDs
RDMA/qedr: Fix iWARP write and send with immediate
RDMA/qedr: Fix kernel panic when running fio over NFSoRDMA
ia64/err-inject: Use get_user_pages_fast()
e1000e: allocate ring descriptors with dma_zalloc_coherent
e1000e: Fix check_for_link return value with autoneg off
batman-adv: Fix multicast packet loss with a single WANT_ALL_IPV4/6 flag
watchdog: sbsa: use 32-bit read for WCV
watchdog: f71808e_wdt: Fix magic close handling
iwlwifi: mvm: fix TX of CCMP 256
KVM: PPC: Book3S HV: Fix VRMA initialization with 2MB or 1GB memory backing
selftests/powerpc: Skip the subpage_prot tests if the syscall is unavailable
Btrfs: send, fix issuing write op when processing hole in no data mode
drm/sun4i: Fix dclk_set_phase
xen/pirq: fix error path cleanup when binding MSIs
nvmet: fix PSDT field check in command format
net/tcp/illinois: replace broken algorithm reference link
gianfar: Fix Rx byte accounting for ndev stats
powerpc/boot: Fix random libfdt related build errors
ARM: dts: NSP: Fix amount of RAM on BCM958625HR
sit: fix IFLA_MTU ignored on NEWLINK
ip6_tunnel: fix IFLA_MTU ignored on NEWLINK
bcache: fix kcrashes with fio in RAID5 backend dev
dmaengine: rcar-dmac: fix max_chunk_size for R-Car Gen3
virtio-gpu: fix ioctl and expose the fixed status to userspace.
r8152: fix tx packets accounting
qrtr: add MODULE_ALIAS macro to smd
ARM: orion5x: Revert commit
|
||
|
Tejun Heo
|
c458c7c783 |
rcu: Call touch_nmi_watchdog() while printing stall warnings
[ Upstream commit 3caa973b7a260e7a2a69edc94c300ab9c65148c3 ] When RCU stall warning triggers, it can print out a lot of messages while holding spinlocks. If the console device is slow (e.g. an actual or IPMI serial console), it may end up triggering NMI hard lockup watchdog like the following. |
||
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Kyle Yan
|
a88270f5d6 |
Merge remote-tracking branch '4.9/tmp-86f97ab' into msm-4.9
* 4.9/tmp-86f97ab:
Linux 4.9.57
KVM: nVMX: update last_nonleaf_level when initializing nested EPT
x86/alternatives: Fix alt_max_short macro to really be a max()
USB: serial: console: fix use-after-free after failed setup
USB: serial: qcserial: add Dell DW5818, DW5819
USB: serial: option: add support for TP-Link LTE module
USB: serial: cp210x: add support for ELV TFD500
USB: serial: ftdi_sio: add id for Cypress WICED dev board
bio_copy_user_iov(): don't ignore ->iov_offset
more bio_map_user_iov() leak fixes
fix unbalanced page refcounting in bio_map_user_iov
direct-io: Prevent NULL pointer access in submit_page_section
usb: gadget: composite: Fix use-after-free in usb_composite_overwrite_options
usb: gadget: configfs: Fix memory leak of interface directory data
drm/i915/bios: parse DDI ports also for CHV for HDMI DDC pin and DP AUX channel
drm/i915: Read timings from the correct transcoder in intel_crtc_mode_get()
drm/i915/edp: Get the Panel Power Off timestamp after panel is off
ALSA: line6: Fix leftover URB at error-path during probe
ALSA: line6: Fix missing initialization before error path
ALSA: caiaq: Fix stray URB at probe error path
ALSA: seq: Fix copy_from_user() call inside lock
ALSA: seq: Fix use-after-free at creating a port
ALSA: usb-audio: Kill stray URB at exiting
fs/mpage.c: fix mpage_writepage() for pages with buffers
device property: Track owner device of device property
iommu/amd: Finish TLB flush in amd_iommu_unmap()
pinctrl/amd: Fix build dependency on pinmux code
usb: renesas_usbhs: Fix DMAC sequence for receiving zero-length packet
KVM: nVMX: fix guest CR4 loading when emulating L2 to L1 exit
KVM: MMU: always terminate page walks at level 1
crypto: shash - Fix zero-length shash ahash digest crash
HID: usbhid: fix out-of-bounds bug
dmaengine: ti-dma-crossbar: Fix possible race condition with dma_inuse
dmaengine: edma: Align the memcpy acnt array size with the transfer
MIPS: math-emu: Remove pr_err() calls from fpu_emu()
USB: dummy-hcd: Fix deadlock caused by disconnect detection
rcu: Allow for page faults in NMI handlers
nl80211: Define policy for packet pattern attributes
CIFS: Reconnect expired SMB sessions
ext4: in ext4_seek_{hole,data}, return -ENXIO for negative offsets
Change-Id: I64affb40416c282aa1421e22e4320d5b99670af9
Signed-off-by: Kyle Yan <kyan@codeaurora.org>
|
||
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Paul E. McKenney
|
97535791d8 |
rcu: Allow for page faults in NMI handlers
commit 28585a832602747cbfa88ad8934013177a3aae38 upstream.
A number of architecture invoke rcu_irq_enter() on exception entry in
order to allow RCU read-side critical sections in the exception handler
when the exception is from an idle or nohz_full CPU. This works, at
least unless the exception happens in an NMI handler. In that case,
rcu_nmi_enter() would already have exited the extended quiescent state,
which would mean that rcu_irq_enter() would (incorrectly) cause RCU
to think that it is again in an extended quiescent state. This will
in turn result in lockdep splats in response to later RCU read-side
critical sections.
This commit therefore causes rcu_irq_enter() and rcu_irq_exit() to
take no action if there is an rcu_nmi_enter() in effect, thus avoiding
the unscheduled return to RCU quiescent state. This in turn should
make the kernel safe for on-demand RCU voyeurism.
Link: http://lkml.kernel.org/r/20170922211022.GA18084@linux.vnet.ibm.com
Fixes:
|
||
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Kyle Yan
|
3dfb68c8ba |
Merge remote-tracking branch '4.9/tmp-9ae2c67' into 4.9
* 4.9/tmp-9ae2c67:
Linux 4.9.40
alarmtimer: don't rate limit one-shot timers
tracing: Fix kmemleak in instance_rmdir
PM / Domains: defer dev_pm_domain_set() until genpd->attach_dev succeeds if present
reiserfs: Don't clear SGID when inheriting ACLs
spmi: Include OF based modalias in device uevent
of: device: Export of_device_{get_modalias, uvent_modalias} to modules
acpi/nfit: Fix memory corruption/Unregister mce decoder on failure
ovl: fix random return value on mount
hfsplus: Don't clear SGID when inheriting ACLs
mlx5: Avoid that mlx5_ib_sg_to_klms() overflows the klms[] array
drm/mst: Avoid processing partially received up/down message transactions
drm/mst: Avoid dereferencing a NULL mstb in drm_dp_mst_handle_up_req()
drm/mst: Fix error handling during MST sideband message reception
RDMA/core: Initialize port_num in qp_attr
ceph: fix race in concurrent readdir
staging: lustre: ko2iblnd: check copy_from_iter/copy_to_iter return code
staging: sm750fb: avoid conflicting vesafb
staging: comedi: ni_mio_common: fix AO timer off-by-one regression
staging: rtl8188eu: add TL-WN722N v2 support
Revert "perf/core: Drop kernel samples even though :u is specified"
perf annotate: Fix broken arrow at row 0 connecting jmp instruction to its target
iser-target: Avoid isert_conn->cm_id dereference in isert_login_recv_done
target: Fix COMPARE_AND_WRITE caw_sem leak during se_cmd quiesce
udf: Fix deadlock between writeback and udf_setsize()
NFS: only invalidate dentrys that are clearly invalid.
sunrpc: use constant time memory comparison for mac
IB/core: Namespace is mandatory input for address resolution
IB/iser: Fix connection teardown race condition
Input: i8042 - fix crash at boot time
MIPS: Fix a typo: s/preset/present/ in r2-to-r6 emulation error message
MIPS: Send SIGILL for R6 branches in `__compute_return_epc_for_insn'
MIPS: Send SIGILL for linked branches in `__compute_return_epc_for_insn'
MIPS: Rename `sigill_r6' to `sigill_r2r6' in `__compute_return_epc_for_insn'
MIPS: Send SIGILL for BPOSGE32 in `__compute_return_epc_for_insn'
MIPS: math-emu: Prevent wrong ISA mode instruction emulation
MIPS: Fix unaligned PC interpretation in `compute_return_epc'
MIPS: Actually decode JALX in `__compute_return_epc_for_insn'
MIPS: Save static registers before sysmips
MIPS: Fix MIPS I ISA /proc/cpuinfo reporting
x86/ioapic: Pass the correct data to unmask_ioapic_irq()
x86/acpi: Prevent out of bound access caused by broken ACPI tables
Revert "ACPI / EC: Enable event freeze mode..." to fix a regression
ACPI / EC: Drop EC noirq hooks to fix a regression
ubifs: Don't leak kernel memory to the MTD
MIPS: Negate error syscall return in trace
MIPS: Fix mips_atomic_set() with EVA
MIPS: Fix mips_atomic_set() retry condition
ftrace: Fix uninitialized variable in match_records()
nvme-rdma: remove race conditions from IB signalling
vfio: New external user group/file match
vfio: Fix group release deadlock
ovl: drop CAP_SYS_RESOURCE from saved mounter's credentials
drm/ttm: Fix use-after-free in ttm_bo_clean_mm
f2fs: Don't clear SGID when inheriting ACLs
f2fs: sanity check size of nat and sit cache
xfs: Don't clear SGID when inheriting ACLs
ipmi:ssif: Add missing unlock in error branch
ipmi: use rcu lock around call to intf->handlers->sender()
drm/radeon: Fix eDP for single-display iMac10,1 (v2)
drm/radeon/ci: disable mclk switching for high refresh rates (v2)
drm/amd/amdgpu: Return error if initiating read out of range on vram
s390/syscalls: Fix out of bounds arguments access
Raid5 should update rdev->sectors after reshape
ext2: Don't clear SGID when inheriting ACLs
libnvdimm: fix badblock range handling of ARS range
libnvdimm, btt: fix btt_rw_page not returning errors
cx88: Fix regression in initial video standard setting
x86/xen: allow userspace access during hypercalls
md: don't use flush_signals in userspace processes
usb: renesas_usbhs: gadget: disable all eps when the driver stops
usb: renesas_usbhs: fix usbhsc_resume() for !USBHSF_RUNTIME_PWCTRL
USB: cdc-acm: add device-id for quirky printer
usb: storage: return on error to avoid a null pointer dereference
mxl111sf: Fix driver to use heap allocate buffers for USB messages
xhci: Bad Ethernet performance plugged in ASM1042A host
xhci: Fix NULL pointer dereference when cleaning up streams for removed host
xhci: fix 20000ms port resume timeout
ipvs: SNAT packet replies only for NATed connections
PCI/PM: Restore the status of PCI devices across hibernation
PCI: rockchip: Use normal register bank for config accessors
PCI: Work around poweroff & suspend-to-RAM issue on Macbook Pro 11
af_key: Fix sadb_x_ipsecrequest parsing
powerpc/mm/radix: Properly clear process table entry
powerpc/asm: Mark cr0 as clobbered in mftb()
powerpc: Fix emulation of mfocrf in emulate_step()
powerpc: Fix emulation of mcrf in emulate_step()
powerpc/64: Fix atomic64_inc_not_zero() to return an int
powerpc/pseries: Fix passing of pp0 in updatepp() and updateboltedpp()
xen/scsiback: Fix a TMR related use-after-free
iscsi-target: Add login_keys_workaround attribute for non RFC initiators
scsi: Add STARGET_CREATED_REMOVE state to scsi_target_state
scsi: ses: do not add a device to an enclosure if enclosure_add_links() fails.
PM / Domains: Fix unsafe iteration over modified list of domains
PM / Domains: Fix unsafe iteration over modified list of domain providers
PM / Domains: Fix unsafe iteration over modified list of device links
ASoC: compress: Derive substream from stream based on direction
igb: Explicitly select page 0 at initialization
btrfs: Don't clear SGID when inheriting ACLs
wlcore: fix 64K page support
Bluetooth: use constant time memory comparison for secret values
perf intel-pt: Clear FUP flag on error
perf intel-pt: Use FUP always when scanning for an IP
perf intel-pt: Ensure never to set 'last_ip' when packet 'count' is zero
perf intel-pt: Fix last_ip usage
perf intel-pt: Ensure IP is zero when state is INTEL_PT_STATE_NO_IP
perf intel-pt: Fix missing stack clear
perf intel-pt: Improve sample timestamp
perf intel-pt: Move decoder error setting into one condition
NFC: Add sockaddr length checks before accessing sa_family in bind handlers
nfc: Fix the sockaddr length sanitization in llcp_sock_connect
nfc: Ensure presence of required attributes in the activate_target handler
NFC: nfcmrvl: fix firmware-management initialisation
NFC: nfcmrvl: use nfc-device for firmware download
NFC: nfcmrvl: do not use device-managed resources
NFC: nfcmrvl_uart: add missing tty-device sanity check
NFC: fix broken device allocation
ath9k: fix an invalid pointer dereference in ath9k_rng_stop()
ath9k: fix tx99 bus error
ath9k: fix tx99 use after free
thermal: cpu_cooling: Avoid accessing potentially freed structures
thermal: max77620: fix device-node reference imbalance
s5p-jpeg: don't return a random width/height
dm mpath: cleanup -Wbool-operation warning in choose_pgpath()
ir-core: fix gcc-7 warning on bool arithmetic
disable new gcc-7.1.1 warnings for now
Use %zu to print resid (size_t).
ANDROID: keychord: Fix a slab out-of-bounds read.
UPSTREAM: af_key: Fix sadb_x_ipsecrequest parsing
ANDROID: lowmemorykiller: Add tgid to kill message
Revert "ANDROID: proc: smaps: Allow smaps access for CAP_SYS_RESOURCE"
4.9.39
kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS
kvm: vmx: Check value written to IA32_BNDCFGS
kvm: x86: Guest BNDCFGS requires guest MPX support
kvm: vmx: Do not disable intercepts for BNDCFGS
tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results
PM / QoS: return -EINVAL for bogus strings
PM / wakeirq: Convert to SRCU
sched/topology: Fix overlapping sched_group_mask
sched/topology: Optimize build_group_mask()
sched/topology: Fix building of overlapping sched-groups
sched/fair, cpumask: Export for_each_cpu_wrap()
Revert "sched/core: Optimize SCHED_SMT"
crypto: caam - fix signals handling
crypto: caam - properly set IV after {en,de}crypt
crypto: sha1-ssse3 - Disable avx2
crypto: atmel - only treat EBUSY as transient if backlog
crypto: talitos - Extend max key length for SHA384/512-HMAC and AEAD
mm: fix overflow check in expand_upwards()
selftests/capabilities: Fix the test_execve test
mnt: Make propagate_umount less slow for overlapping mount propagation trees
mnt: In propgate_umount handle visiting mounts in any order
mnt: In umount propagation reparent in a separate pass
nvmem: core: fix leaks on registration errors
rcu: Add memory barriers for NOCB leader wakeup
vt: fix unchecked __put_user() in tioclinux ioctls
ARM64: dts: marvell: armada37xx: Fix timer interrupt specifiers
exec: Limit arg stack to at most 75% of _STK_LIM
s390: reduce ELF_ET_DYN_BASE
powerpc: move ELF_ET_DYN_BASE to 4GB / 4MB
arm64: move ELF_ET_DYN_BASE to 4GB / 4MB
arm: move ELF_ET_DYN_BASE to 4MB
binfmt_elf: use ELF_ET_DYN_BASE only for PIE
checkpatch: silence perl 5.26.0 unescaped left brace warnings
fs/dcache.c: fix spin lockup issue on nlru->lock
mm/list_lru.c: fix list_lru_count_node() to be race free
kernel/extable.c: mark core_kernel_text notrace
thp, mm: fix crash due race in MADV_FREE handling
tools/lib/lockdep: Reduce MAX_LOCK_DEPTH to avoid overflowing lock_chain/: Depth
parisc/mm: Ensure IRQs are off in switch_mm()
parisc: DMA API: return error instead of BUG_ON for dma ops on non dma devs
parisc: use compat_sys_keyctl()
parisc: Report SIGSEGV instead of SIGBUS when running out of stack
irqchip/gic-v3: Fix out-of-bound access in gic_set_affinity
cfg80211: Check if NAN service ID is of expected size
cfg80211: Check if PMKID attribute is of expected size
cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES
cfg80211: Define nla_policy for NL80211_ATTR_LOCAL_MESH_POWER_MODE
sfc: don't read beyond unicast address list
brcmfmac: Fix glom_skb leak in brcmf_sdiod_recv_chain
brcmfmac: Fix a memory leak in error handling path in 'brcmf_cfg80211_attach'
brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx()
rds: tcp: use sock_create_lite() to create the accept socket
vrf: fix bug_on triggered by rx when destroying a vrf
net: ipv6: Compare lwstate in detecting duplicate nexthops
net: core: Fix slab-out-of-bounds in netdev_stats_to_stats64
vxlan: fix hlist corruption
ipv6: dad: don't remove dynamic addresses if link is down
net/mlx5e: Fix TX carrier errors report in get stats ndo
liquidio: fix bug in soft reset failure detection
net/mlx5: Cancel delayed recovery work when unloading the driver
net: handle NAPI_GRO_FREE_STOLEN_HEAD case also in napi_frags_finish()
bpf: prevent leaking pointer via xadd on unpriviledged
rocker: move dereference before free
bridge: mdb: fix leak on complete_info ptr on fail path
net: prevent sign extension in dev_get_stats()
tcp: reset sk_rx_dst in tcp_disconnect()
net: dp83640: Avoid NULL pointer dereference.
ipv6: avoid unregistering inet6_dev for loopback
net/phy: micrel: configure intterupts after autoneg workaround
net: sched: Fix one possible panic when no destroy callback
net_sched: fix error recovery at qdisc creation
xen-netfront: Rework the fix for Rx stall during OOM and network stress
ANDROID: android-verity: mark dev as rw for linear target
ANDROID: sdcardfs: Remove unnecessary lock
ANDROID: binder: don't check prio permissions on restore.
Add BINDER_GET_NODE_DEBUG_INFO ioctl
ANDROID: binder: add RT inheritance flag to node.
ANDROID: binder: improve priority inheritance.
ANDROID: binder: add min sched_policy to node.
ANDROID: binder: add support for RT prio inheritance.
ANDROID: binder: push new transactions to waiting threads.
ANDROID: binder: remove proc waitqueue
Conflicts:
drivers/staging/android/lowmemorykiller.c
Change-Id: I2954e47d7e4fc74cf9bb5033fc151537958b78af
Signed-off-by: Kyle Yan <kyan@codeaurora.org>
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Paul E. McKenney
|
ac5e9e801f |
rcu: Add memory barriers for NOCB leader wakeup
commit 6b5fc3a1331810db407c9e0e673dc1837afdc9d0 upstream. Wait/wakeup operations do not guarantee ordering on their own. Instead, either locking or memory barriers are required. This commit therefore adds memory barriers to wake_nocb_leader() and nocb_leader_wait(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Krister Johansen <kjlx@templeofstupid.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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Sebastian Andrzej Siewior
|
7b6c53fae7 |
rcu: update: Make RCU_EXPEDITE_BOOT be the default
RCU_EXPEDITE_BOOT should speed up the boot process by enforcing synchronize_rcu_expedited() instead of synchronize_rcu() during the boot process. There should be no reason why one does not want this and there is no need worry about real time latency at this point. Therefore make it default. Note that users wishing to avoid expediting entirely, for example when bringing up new hardware possibly having flaky IPIs, can use the rcu_normal boot parameter to override boot-time expediting. Change-Id: I758bb7819bb2b18ad7232c3e943b9c1cb85d49e9 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> [ paulmck: Reworded commit log. ] Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> |
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Channagoud Kadabi
|
2eada80751 |
kernel: rcu: Panic on RCU stall
Enable panic on RCU stalls if the RCU_PANIC_ON_STALL is enabled. This helps collecting the cpu context for debugging. Change-Id: Ibc95799df995bf31053152ab9b3894710fcd9f43 Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org> |
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Paul E. McKenney
|
90687fc3c8 |
rcu: Narrow early boot window of illegal synchronous grace periods
commit 52d7e48b86fc108e45a656d8e53e4237993c481d upstream. The current preemptible RCU implementation goes through three phases during bootup. In the first phase, there is only one CPU that is running with preemption disabled, so that a no-op is a synchronous grace period. In the second mid-boot phase, the scheduler is running, but RCU has not yet gotten its kthreads spawned (and, for expedited grace periods, workqueues are not yet running. During this time, any attempt to do a synchronous grace period will hang the system (or complain bitterly, depending). In the third and final phase, RCU is fully operational and everything works normally. This has been OK for some time, but there has recently been some synchronous grace periods showing up during the second mid-boot phase. This code worked "by accident" for awhile, but started failing as soon as expedited RCU grace periods switched over to workqueues in commit |
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Paul E. McKenney
|
bdeaa468e2 |
rcu: Remove cond_resched() from Tiny synchronize_sched()
commit f466ae66fa6a599f9a53b5f9bafea4b8cfffa7fb upstream.
It is now legal to invoke synchronize_sched() at early boot, which causes
Tiny RCU's synchronize_sched() to emit spurious splats. This commit
therefore removes the cond_resched() from Tiny RCU's synchronize_sched().
Fixes:
|
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Linus Torvalds
|
9ffc66941d |
Merge tag 'gcc-plugins-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Pull gcc plugins update from Kees Cook: "This adds a new gcc plugin named "latent_entropy". It is designed to extract as much possible uncertainty from a running system at boot time as possible, hoping to capitalize on any possible variation in CPU operation (due to runtime data differences, hardware differences, SMP ordering, thermal timing variation, cache behavior, etc). At the very least, this plugin is a much more comprehensive example for how to manipulate kernel code using the gcc plugin internals" * tag 'gcc-plugins-v4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: latent_entropy: Mark functions with __latent_entropy gcc-plugins: Add latent_entropy plugin |
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Emese Revfy
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0766f788eb |
latent_entropy: Mark functions with __latent_entropy
The __latent_entropy gcc attribute can be used only on functions and variables. If it is on a function then the plugin will instrument it for gathering control-flow entropy. If the attribute is on a variable then the plugin will initialize it with random contents. The variable must be an integer, an integer array type or a structure with integer fields. These specific functions have been selected because they are init functions (to help gather boot-time entropy), are called at unpredictable times, or they have variable loops, each of which provide some level of latent entropy. Signed-off-by: Emese Revfy <re.emese@gmail.com> [kees: expanded commit message] Signed-off-by: Kees Cook <keescook@chromium.org> |
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Linus Torvalds
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00bcf5cdd6 |
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"The main changes in this cycle were:
- rwsem micro-optimizations (Davidlohr Bueso)
- Improve the implementation and optimize the performance of
percpu-rwsems. (Peter Zijlstra.)
- Convert all lglock users to better facilities such as percpu-rwsems
or percpu-spinlocks and remove lglocks. (Peter Zijlstra)
- Remove the ticket (spin)lock implementation. (Peter Zijlstra)
- Korean translation of memory-barriers.txt and related fixes to the
English document. (SeongJae Park)
- misc fixes and cleanups"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
x86/cmpxchg, locking/atomics: Remove superfluous definitions
x86, locking/spinlocks: Remove ticket (spin)lock implementation
locking/lglock: Remove lglock implementation
stop_machine: Remove stop_cpus_lock and lg_double_lock/unlock()
fs/locks: Use percpu_down_read_preempt_disable()
locking/percpu-rwsem: Add down_read_preempt_disable()
fs/locks: Replace lg_local with a per-cpu spinlock
fs/locks: Replace lg_global with a percpu-rwsem
locking/percpu-rwsem: Add DEFINE_STATIC_PERCPU_RWSEMand percpu_rwsem_assert_held()
locking/pv-qspinlock: Use cmpxchg_release() in __pv_queued_spin_unlock()
locking/rwsem, x86: Drop a bogus cc clobber
futex: Add some more function commentry
locking/hung_task: Show all locks
locking/rwsem: Scan the wait_list for readers only once
locking/rwsem: Remove a few useless comments
locking/rwsem: Return void in __rwsem_mark_wake()
locking, rcu, cgroup: Avoid synchronize_sched() in __cgroup_procs_write()
locking/Documentation: Add Korean translation
locking/Documentation: Fix a typo of example result
locking/Documentation: Fix wrong section reference
...
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Paul E. McKenney
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d74b62bc32 |
Merge branches 'doc.2016.08.22c', 'exp.2016.08.22c', 'fixes.2016.09.14a', 'hotplug.2016.08.22c' and 'torture.2016.08.22c' into HEAD
doc.2016.08.22c: Documentation updates exp.2016.08.22c: Expedited grace-period updates fixes.2016.09.14a: Miscellaneous fixes hotplug.2016.08.22c: CPU-hotplug changes torture.2016.08.22c: Torture-test changes |
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SeongJae Park
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a56fefa260 |
rcuperf: Consistently insert space between flag and message
A few rcuperf dmesg output messages have no space between the flag and the start of the message. In contrast, every other messages consistently supplies a single space. This difference makes rcuperf dmesg output hard to read and to mechanically parse. This commit therefore fixes this problem by modifying a pr_alert() call and PERFOUT_STRING() macro function to provide that single space. Signed-off-by: SeongJae Park <sj38.park@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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SeongJae Park
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472213a675 |
rcutorture: Print out barrier error as document says
Tests for rcu_barrier() were introduced by commit
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Paul E. McKenney
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4ffa669924 |
torture: Add task state to writer-task stall printk()s
This commit adds a dump of the scheduler state for stalled rcutorture writer tasks. This addition provides yet more debug for the intermittent "failures to proceed", where grace periods move ahead but the rcutorture writer tasks fail to do so. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Sebastian Andrzej Siewior
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0ffd374b22 |
rcutorture: Convert to hotplug state machine
Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. Cc: Josh Triplett <josh@joshtriplett.org> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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7ec99de36f |
rcu: Provide exact CPU-online tracking for RCU
Up to now, RCU has assumed that the CPU-online process makes it from CPU_UP_PREPARE to set_cpu_online() within one jiffy. Given the recent rise of virtualized environments, this assumption is very clearly obsolete. Failing to meet this deadline can result in RCU paying attention to an incoming CPU for one jiffy, then ignoring it until the grace period following the one in which that CPU sets itself online. This situation might prove to be fatally disappointing to any RCU read-side critical sections that had the misfortune to execute during the time in which RCU was ignoring the slow-to-come-online CPU. This commit therefore updates RCU's internal CPU state-tracking information at notify_cpu_starting() time, thus providing RCU with an exact transition of the CPU's state from offline to online. Note that this means that incoming CPUs must not use RCU read-side critical section (other than those of SRCU) until notify_cpu_starting() time. Note also that the CPU_STARTING notifiers -are- allowed to use RCU read-side critical sections. (Of course, CPU-hotplug notifiers are rapidly becoming obsolete, so you need to act fast!) If a given architecture or CPU family needs to use RCU read-side critical sections earlier, the call to rcu_cpu_starting() from notify_cpu_starting() will need to be architecture-specific, with architectures that need early use being required to hand-place the call to rcu_cpu_starting() at some point preceding the call to notify_cpu_starting(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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3563a438f1 |
rcu: Avoid redundant quiescent-state chasing
Currently, __note_gp_changes() checks to see if the CPU has slept through multiple grace periods. If it has, it resynchronizes that CPU's view of the grace-period state, which includes whether or not the current grace period needs a quiescent state from this CPU. The fact of this need (or lack thereof) needs to be in two places, rdp->cpu_no_qs.b.norm and rdp->core_needs_qs. The former tells RCU's context-switch code to go get a quiescent state and the latter says that it needs to be reported. The current code unconditionally sets the former to true, but correctly sets the latter. This does not result in failures, but it does unnecessarily increase the amount of work done on average at context-switch time. This commit therefore correctly sets both fields. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul Gortmaker
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e77b704125 |
rcu: Don't use modular infrastructure in non-modular code
The Kconfig currently controlling compilation of tree.c is: init/Kconfig:config TREE_RCU init/Kconfig: bool ...and update.c and sync.c are "obj-y" meaning that none are ever built as a module by anyone. Since MODULE_ALIAS is a no-op for non-modular code, we can remove them from these files. We leave moduleparam.h behind since the files instantiate some boot time configuration parameters with module_param() still. Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Jisheng Zhang
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94d4477673 |
rcu: Use rcu_gp_kthread_wake() to wake up grace period kthreads
Commit |
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Paul E. McKenney
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385c859f67 |
rcu: Use RCU's online-CPU state for expedited IPI retry
This commit improves the accuracy of the interaction between CPU hotplug operations and RCU's expedited grace periods by using RCU's online-CPU state to determine when failed IPIs should be retried. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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98834b8378 |
rcu: Exclude RCU-offline CPUs from expedited grace periods
The expedited RCU grace periods currently rely on a failure indication from smp_call_function_single() to determine that a given CPU is offline. This works after a fashion, but is more contorted and less precise than relying on RCU's internal state. This commit therefore takes a first step towards relying on internal state. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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24a6cff286 |
rcu: Make expedited RCU CPU stall warnings respond to controls
The expedited RCU CPU stall warnings currently responds to neither the panic_on_rcu_stall sysctl setting nor the rcupdate.rcu_cpu_stall_suppress kernel boot parameter. This commit therefore updates the expedited code to respond to these two controls. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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908d2c1fd1 |
rcu: Stop disabling expedited RCU CPU stall warnings
Now that RCU expedited grace periods are always driven by a workqueue, there is no need to account for signal reception, and thus no need to disable expedited RCU CPU stall warnings due to signal reception. This commit therefore removes the signal-reception checks, leaving a WARN_ON() to catch possible future bugs. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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8b355e3bc1 |
rcu: Drive expedited grace periods from workqueue
The current implementation of expedited grace periods has the user task drive the grace period. This works, but has downsides: (1) The user task must awaken tasks piggybacking on this grace period, which can result in latencies rivaling that of the grace period itself, and (2) User tasks can receive signals, which interfere with RCU CPU stall warnings. This commit therefore uses workqueues to drive the grace periods, so that the user task need not do the awakening. A subsequent commit will remove the now-unnecessary code allowing for signals. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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f7b8eb847e |
rcu: Consolidate expedited grace period machinery
The functions synchronize_rcu_expedited() and synchronize_sched_expedited() have nearly identical code. This commit therefore consolidates this code into a new _synchronize_rcu_expedited() function. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Ding Tianhong
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bedc196915 |
rcu: Fix soft lockup for rcu_nocb_kthread
Carrying out the following steps results in a softlockup in the RCU callback-offload (rcuo) kthreads: 1. Connect to ixgbevf, and set the speed to 10Gb/s. 2. Use ifconfig to bring the nic up and down repeatedly. [ 317.005148] IPv6: ADDRCONF(NETDEV_CHANGE): eth2: link becomes ready [ 368.106005] BUG: soft lockup - CPU#1 stuck for 22s! [rcuos/1:15] [ 368.106005] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 368.106005] task: ffff88057dd8a220 ti: ffff88057dd9c000 task.ti: ffff88057dd9c000 [ 368.106005] RIP: 0010:[<ffffffff81579e04>] [<ffffffff81579e04>] fib_table_lookup+0x14/0x390 [ 368.106005] RSP: 0018:ffff88061fc83ce8 EFLAGS: 00000286 [ 368.106005] RAX: 0000000000000001 RBX: 00000000020155c0 RCX: 0000000000000001 [ 368.106005] RDX: ffff88061fc83d50 RSI: ffff88061fc83d70 RDI: ffff880036d11a00 [ 368.106005] RBP: ffff88061fc83d08 R08: 0000000000000001 R09: 0000000000000000 [ 368.106005] R10: ffff880036d11a00 R11: ffffffff819e0900 R12: ffff88061fc83c58 [ 368.106005] R13: ffffffff816154dd R14: ffff88061fc83d08 R15: 00000000020155c0 [ 368.106005] FS: 0000000000000000(0000) GS:ffff88061fc80000(0000) knlGS:0000000000000000 [ 368.106005] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 368.106005] CR2: 00007f8c2aee9c40 CR3: 000000057b222000 CR4: 00000000000407e0 [ 368.106005] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 368.106005] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 368.106005] Stack: [ 368.106005] 00000000010000c0 ffff88057b766000 ffff8802e380b000 ffff88057af03e00 [ 368.106005] ffff88061fc83dc0 ffffffff815349a6 ffff88061fc83d40 ffffffff814ee146 [ 368.106005] ffff8802e380af00 00000000e380af00 ffffffff819e0900 020155c0010000c0 [ 368.106005] Call Trace: [ 368.106005] <IRQ> [ 368.106005] [ 368.106005] [<ffffffff815349a6>] ip_route_input_noref+0x516/0xbd0 [ 368.106005] [<ffffffff814ee146>] ? skb_release_data+0xd6/0x110 [ 368.106005] [<ffffffff814ee20a>] ? kfree_skb+0x3a/0xa0 [ 368.106005] [<ffffffff8153698f>] ip_rcv_finish+0x29f/0x350 [ 368.106005] [<ffffffff81537034>] ip_rcv+0x234/0x380 [ 368.106005] [<ffffffff814fd656>] __netif_receive_skb_core+0x676/0x870 [ 368.106005] [<ffffffff814fd868>] __netif_receive_skb+0x18/0x60 [ 368.106005] [<ffffffff814fe4de>] process_backlog+0xae/0x180 [ 368.106005] [<ffffffff814fdcb2>] net_rx_action+0x152/0x240 [ 368.106005] [<ffffffff81077b3f>] __do_softirq+0xef/0x280 [ 368.106005] [<ffffffff8161619c>] call_softirq+0x1c/0x30 [ 368.106005] <EOI> [ 368.106005] [ 368.106005] [<ffffffff81015d95>] do_softirq+0x65/0xa0 [ 368.106005] [<ffffffff81077174>] local_bh_enable+0x94/0xa0 [ 368.106005] [<ffffffff81114922>] rcu_nocb_kthread+0x232/0x370 [ 368.106005] [<ffffffff81098250>] ? wake_up_bit+0x30/0x30 [ 368.106005] [<ffffffff811146f0>] ? rcu_start_gp+0x40/0x40 [ 368.106005] [<ffffffff8109728f>] kthread+0xcf/0xe0 [ 368.106005] [<ffffffff810971c0>] ? kthread_create_on_node+0x140/0x140 [ 368.106005] [<ffffffff816147d8>] ret_from_fork+0x58/0x90 [ 368.106005] [<ffffffff810971c0>] ? kthread_create_on_node+0x140/0x140 ==================================cut here============================== It turns out that the rcuos callback-offload kthread is busy processing a very large quantity of RCU callbacks, and it is not reliquishing the CPU while doing so. This commit therefore adds an cond_resched_rcu_qs() within the loop to allow other tasks to run. Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> [ paulmck: Substituted cond_resched_rcu_qs for cond_resched. ] Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Peter Zijlstra
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3942a9bd7b |
locking, rcu, cgroup: Avoid synchronize_sched() in __cgroup_procs_write()
The current percpu-rwsem read side is entirely free of serializing insns at the cost of having a synchronize_sched() in the write path. The latency of the synchronize_sched() is too high for cgroups. The commit |
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Peter Zijlstra
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80127a3968 |
locking/percpu-rwsem: Optimize readers and reduce global impact
Currently the percpu-rwsem switches to (global) atomic ops while a writer is waiting; which could be quite a while and slows down releasing the readers. This patch cures this problem by ordering the reader-state vs reader-count (see the comments in __percpu_down_read() and percpu_down_write()). This changes a global atomic op into a full memory barrier, which doesn't have the global cacheline contention. This also enables using the percpu-rwsem with rcu_sync disabled in order to bias the implementation differently, reducing the writer latency by adding some cost to readers. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org [ Fixed modular build. ] Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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Linus Torvalds
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a6408f6cb6 |
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull smp hotplug updates from Thomas Gleixner:
"This is the next part of the hotplug rework.
- Convert all notifiers with a priority assigned
- Convert all CPU_STARTING/DYING notifiers
The final removal of the STARTING/DYING infrastructure will happen
when the merge window closes.
Another 700 hundred line of unpenetrable maze gone :)"
* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits)
timers/core: Correct callback order during CPU hot plug
leds/trigger/cpu: Move from CPU_STARTING to ONLINE level
powerpc/numa: Convert to hotplug state machine
arm/perf: Fix hotplug state machine conversion
irqchip/armada: Avoid unused function warnings
ARC/time: Convert to hotplug state machine
clocksource/atlas7: Convert to hotplug state machine
clocksource/armada-370-xp: Convert to hotplug state machine
clocksource/exynos_mct: Convert to hotplug state machine
clocksource/arm_global_timer: Convert to hotplug state machine
rcu: Convert rcutree to hotplug state machine
KVM/arm/arm64/vgic-new: Convert to hotplug state machine
smp/cfd: Convert core to hotplug state machine
x86/x2apic: Convert to CPU hotplug state machine
profile: Convert to hotplug state machine
timers/core: Convert to hotplug state machine
hrtimer: Convert to hotplug state machine
x86/tboot: Convert to hotplug state machine
arm64/armv8 deprecated: Convert to hotplug state machine
hwtracing/coresight-etm4x: Convert to hotplug state machine
...
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Linus Torvalds
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c86ad14d30 |
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"The locking tree was busier in this cycle than the usual pattern - a
couple of major projects happened to coincide.
The main changes are:
- implement the atomic_fetch_{add,sub,and,or,xor}() API natively
across all SMP architectures (Peter Zijlstra)
- add atomic_fetch_{inc/dec}() as well, using the generic primitives
(Davidlohr Bueso)
- optimize various aspects of rwsems (Jason Low, Davidlohr Bueso,
Waiman Long)
- optimize smp_cond_load_acquire() on arm64 and implement LSE based
atomic{,64}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
on arm64 (Will Deacon)
- introduce smp_acquire__after_ctrl_dep() and fix various barrier
mis-uses and bugs (Peter Zijlstra)
- after discovering ancient spin_unlock_wait() barrier bugs in its
implementation and usage, strengthen its semantics and update/fix
usage sites (Peter Zijlstra)
- optimize mutex_trylock() fastpath (Peter Zijlstra)
- ... misc fixes and cleanups"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (67 commits)
locking/atomic: Introduce inc/dec variants for the atomic_fetch_$op() API
locking/barriers, arch/arm64: Implement LDXR+WFE based smp_cond_load_acquire()
locking/static_keys: Fix non static symbol Sparse warning
locking/qspinlock: Use __this_cpu_dec() instead of full-blown this_cpu_dec()
locking/atomic, arch/tile: Fix tilepro build
locking/atomic, arch/m68k: Remove comment
locking/atomic, arch/arc: Fix build
locking/Documentation: Clarify limited control-dependency scope
locking/atomic, arch/rwsem: Employ atomic_long_fetch_add()
locking/atomic, arch/qrwlock: Employ atomic_fetch_add_acquire()
locking/atomic, arch/mips: Convert to _relaxed atomics
locking/atomic, arch/alpha: Convert to _relaxed atomics
locking/atomic: Remove the deprecated atomic_{set,clear}_mask() functions
locking/atomic: Remove linux/atomic.h:atomic_fetch_or()
locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
locking/atomic: Fix atomic64_relaxed() bits
locking/atomic, arch/xtensa: Implement atomic_fetch_{add,sub,and,or,xor}()
locking/atomic, arch/x86: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
locking/atomic, arch/tile: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
locking/atomic, arch/sparc: Implement atomic{,64}_fetch_{add,sub,and,or,xor}()
...
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Thomas Gleixner
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4df8374254 |
rcu: Convert rcutree to hotplug state machine
Straight forward conversion to the state machine. Though the question arises whether this needs really all these state transitions to work. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160713153337.982013161@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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Paul E. McKenney
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4d03754f04 |
Merge branches 'doc.2016.06.15a', 'fixes.2016.06.15b' and 'torture.2016.06.14a' into HEAD
doc.2016.06.15a: Documentation updates fixes.2016.06.15b: Documentation updates torture.2016.06.14a: Documentation updates |
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Mark Rutland
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bc75e99983 |
rcu: Correctly handle sparse possible cpus
In many cases in the RCU tree code, we iterate over the set of cpus for a leaf node described by rcu_node::grplo and rcu_node::grphi, checking per-cpu data for each cpu in this range. However, if the set of possible cpus is sparse, some cpus described in this range are not possible, and thus no per-cpu region will have been allocated (or initialised) for them by the generic percpu code. Erroneous accesses to a per-cpu area for these !possible cpus may fault or may hit other data depending on the addressed generated when the erroneous per cpu offset is applied. In practice, both cases have been observed on arm64 hardware (the former being silent, but detectable with additional patches). To avoid issues resulting from this, we must iterate over the set of *possible* cpus for a given leaf node. This patch add a new helper, for_each_leaf_node_possible_cpu, to enable this. As iteration is often intertwined with rcu_node local bitmask manipulation, a new leaf_node_cpu_bit helper is added to make this simpler and more consistent. The RCU tree code is made to use both of these where appropriate. Without this patch, running reboot at a shell can result in an oops like: [ 3369.075979] Unable to handle kernel paging request at virtual address ffffff8008b21b4c [ 3369.083881] pgd = ffffffc3ecdda000 [ 3369.087270] [ffffff8008b21b4c] *pgd=00000083eca48003, *pud=00000083eca48003, *pmd=0000000000000000 [ 3369.096222] Internal error: Oops: 96000007 [#1] PREEMPT SMP [ 3369.101781] Modules linked in: [ 3369.104825] CPU: 2 PID: 1817 Comm: NetworkManager Tainted: G W 4.6.0+ #3 [ 3369.121239] task: ffffffc0fa13e000 ti: ffffffc3eb940000 task.ti: ffffffc3eb940000 [ 3369.128708] PC is at sync_rcu_exp_select_cpus+0x188/0x510 [ 3369.134094] LR is at sync_rcu_exp_select_cpus+0x104/0x510 [ 3369.139479] pc : [<ffffff80081109a8>] lr : [<ffffff8008110924>] pstate: 200001c5 [ 3369.146860] sp : ffffffc3eb9435a0 [ 3369.150162] x29: ffffffc3eb9435a0 x28: ffffff8008be4f88 [ 3369.155465] x27: ffffff8008b66c80 x26: ffffffc3eceb2600 [ 3369.160767] x25: 0000000000000001 x24: ffffff8008be4f88 [ 3369.166070] x23: ffffff8008b51c3c x22: ffffff8008b66c80 [ 3369.171371] x21: 0000000000000001 x20: ffffff8008b21b40 [ 3369.176673] x19: ffffff8008b66c80 x18: 0000000000000000 [ 3369.181975] x17: 0000007fa951a010 x16: ffffff80086a30f0 [ 3369.187278] x15: 0000007fa9505590 x14: 0000000000000000 [ 3369.192580] x13: ffffff8008b51000 x12: ffffffc3eb940000 [ 3369.197882] x11: 0000000000000006 x10: ffffff8008b51b78 [ 3369.203184] x9 : 0000000000000001 x8 : ffffff8008be4000 [ 3369.208486] x7 : ffffff8008b21b40 x6 : 0000000000001003 [ 3369.213788] x5 : 0000000000000000 x4 : ffffff8008b27280 [ 3369.219090] x3 : ffffff8008b21b4c x2 : 0000000000000001 [ 3369.224406] x1 : 0000000000000001 x0 : 0000000000000140 ... [ 3369.972257] [<ffffff80081109a8>] sync_rcu_exp_select_cpus+0x188/0x510 [ 3369.978685] [<ffffff80081128b4>] synchronize_rcu_expedited+0x64/0xa8 [ 3369.985026] [<ffffff80086b987c>] synchronize_net+0x24/0x30 [ 3369.990499] [<ffffff80086ddb54>] dev_deactivate_many+0x28c/0x298 [ 3369.996493] [<ffffff80086b6bb8>] __dev_close_many+0x60/0xd0 [ 3370.002052] [<ffffff80086b6d48>] __dev_close+0x28/0x40 [ 3370.007178] [<ffffff80086bf62c>] __dev_change_flags+0x8c/0x158 [ 3370.012999] [<ffffff80086bf718>] dev_change_flags+0x20/0x60 [ 3370.018558] [<ffffff80086cf7f0>] do_setlink+0x288/0x918 [ 3370.023771] [<ffffff80086d0798>] rtnl_newlink+0x398/0x6a8 [ 3370.029158] [<ffffff80086cee84>] rtnetlink_rcv_msg+0xe4/0x220 [ 3370.034891] [<ffffff80086e274c>] netlink_rcv_skb+0xc4/0xf8 [ 3370.040364] [<ffffff80086ced8c>] rtnetlink_rcv+0x2c/0x40 [ 3370.045663] [<ffffff80086e1fe8>] netlink_unicast+0x160/0x238 [ 3370.051309] [<ffffff80086e24b8>] netlink_sendmsg+0x2f0/0x358 [ 3370.056956] [<ffffff80086a0070>] sock_sendmsg+0x18/0x30 [ 3370.062168] [<ffffff80086a21cc>] ___sys_sendmsg+0x26c/0x280 [ 3370.067728] [<ffffff80086a30ac>] __sys_sendmsg+0x44/0x88 [ 3370.073027] [<ffffff80086a3100>] SyS_sendmsg+0x10/0x20 [ 3370.078153] [<ffffff8008085e70>] el0_svc_naked+0x24/0x28 Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reported-by: Dennis Chen <dennis.chen@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Steve Capper <steve.capper@arm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Daniel Bristot de Oliveira
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088e9d253d |
rcu: sysctl: Panic on RCU Stall
It is not always easy to determine the cause of an RCU stall just by analysing the RCU stall messages, mainly when the problem is caused by the indirect starvation of rcu threads. For example, when preempt_rcu is not awakened due to the starvation of a timer softirq. We have been hard coding panic() in the RCU stall functions for some time while testing the kernel-rt. But this is not possible in some scenarios, like when supporting customers. This patch implements the sysctl kernel.panic_on_rcu_stall. If set to 1, the system will panic() when an RCU stall takes place, enabling the capture of a vmcore. The vmcore provides a way to analyze all kernel/tasks states, helping out to point to the culprit and the solution for the stall. The kernel.panic_on_rcu_stall sysctl is disabled by default. Changes from v1: - Fixed a typo in the git log - The if(sysctl_panic_on_rcu_stall) panic() is in a static function - Fixed the CONFIG_TINY_RCU compilation issue - The var sysctl_panic_on_rcu_stall is now __read_mostly Cc: Jonathan Corbet <corbet@lwn.net> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Reviewed-by: Arnaldo Carvalho de Melo <acme@kernel.org> Tested-by: "Luis Claudio R. Goncalves" <lgoncalv@redhat.com> Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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aab057382c |
rcu: Fix a typo in a comment
In the area in hot pursuit of a bug, so might as well clean it up. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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4929c913bd |
rcu: Make call_rcu_tasks() tolerate first call with irqs disabled
Currently, if the very first call to call_rcu_tasks() has irqs disabled, it will create the rcu_tasks_kthread with irqs disabled, which will result in a splat in the memory allocator, which kthread_run() invokes with the expectation that irqs are enabled. This commit fixes this problem by deferring kthread creation if called with irqs disabled. The first call to call_rcu_tasks() that has irqs enabled will create the kthread. This bug was detected by rcutorture changes that were motivated by Iftekhar Ahmed's mutation-testing efforts. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Wei Yongjun
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05dbbfe753 |
rcutorture: Fix error return code in rcu_perf_init()
Fix to return a negative error code -ENOMEM from kcalloc() error handling case instead of 0, as done elsewhere in this function. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Boqun Feng
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af06d4f74a |
rcuperf: Don't treat gp_exp mis-setting as a WARN
0day found a boot warning triggered in rcu_perf_writer() on !SMP kernel: WARN_ON(rcu_gp_is_normal() && gp_exp); , the root cause of which is trying to measure expedited grace periods(by setting gp_exp to true by default) when all the grace periods are normal(TINY RCU only has normal grace periods). However, such a mis-setting would only result in failing to measure the performance for a specific kind of grace periods, therefore using a WARN_ON to check this is a little overkilling. We could handle this inside rcuperf module via some error messages to tell users about the mis-settings. Therefore this patch removes the WARN_ON in rcu_perf_writer() and handles those checkings in rcu_perf_init() with plain if() code. Moreover, this patch changes the default value of gp_exp to 1) align with rcutorture tests and 2) make the default setting work for all RCU implementations by default. Suggested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Fixes: http://lkml.kernel.org/r/57411b10.mFvG0+AgcrMXGtcj%fengguang.wu@intel.com Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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4e9a073f60 |
torture: Remove CONFIG_RCU_TORTURE_TEST_RUNNABLE, simplify code
This commit removes CONFIG_RCU_TORTURE_TEST_RUNNABLE in favor of the already-existing rcutorture.torture_runnable kernel boot parameter. It also converts an #ifdef into IS_ENABLED(), saving a few lines of code. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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f8cbdee99b |
torture: Simplify code, eliminate RCU_PERF_TEST_RUNNABLE
This commit applies the infamous IS_ENABLED() macro to eliminate a #ifdef. It also eliminates the RCU_PERF_TEST_RUNNABLE Kconfig option in favor of the already-existing rcuperf.perf_runnable kernel boot parameter. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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40e0a6cfd5 |
rcu: Move expedited code from tree_plugin.h to tree_exp.h
People have been having some difficulty finding their way around the RCU code. This commit therefore pulls some of the expedited grace-period code from tree_plugin.h to a new tree_exp.h file. This commit is strictly code movement. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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Paul E. McKenney
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3549c2bc2c |
rcu: Move expedited code from tree.c to tree_exp.h
People have been having some difficulty finding their way around the RCU code. This commit therefore pulls some of the expedited grace-period code from tree.c to a new tree_exp.h file. This commit is strictly code movement, with the exception of a forward declaration that was added for the sync_sched_exp_online_cleanup() function. A subsequent commit will move the remaining expedited grace-period code from tree_plugin.h to tree_exp.h. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |