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Pavankumar Kondeti 516b19042c sched/cputime: fix a deadlock on 32bit systems

cpu_hardirq_time and cpu_softirq_time are protected with
seqlock on 32bit systems. There is a potential deadlock
with this seqlock and rq->lock.

CPU 1                             CPU0
==========================        ========================
--> acquire CPU0 rq->lock         --> __irq_enter()
----> task enqueue/dequeue        ----> irqtime_account_irq()
------> update_rq_clock()         ------> irq_time_write_begin()
--------> irq_time_read()         --------> sched_account_irqtime()
(waiting for the seqlock          (waiting for the CPU0 rq->lock)
held in irq_time_write_begin()

Fix this issue by dropping the seqlock before calling
sched_account_irqtime()

Change-Id: I29a33876e372f99435a57cc11eada9c8cfd59a3f
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>

2016-03-23 20:02:39 -07:00

..

bpf: fix allocation warnings in bpf maps and integer overflow

2015-12-02 23:36:00 -05:00

kconfig: add xenconfig defconfig helper

2015-06-16 11:04:29 +01:00

kdb: support new lines without carriage returns

2016-02-16 13:52:21 -08:00

Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-01-08 13:52:59 -08:00

gcov: add support for GCC 5.1

2015-06-30 19:44:57 -07:00

genirq: Prevent chip buslock deadlock

2015-12-14 09:45:06 +01:00

livepatch: x86: fix relocation computation with kASLR

2015-11-11 17:36:04 +01:00

lib: spinlock: Trigger a watchdog bite on spin_dump for rwlock

2016-03-22 11:16:32 -07:00

qos: Add support for PM_QOS_SUM type

2016-03-01 12:22:50 -08:00

kernel: printk: specify alignment for struct printk_log

2016-03-22 11:09:56 -07:00

Merge branches 'doc.2015.10.06a', 'percpu-rwsem.2015.10.06a' and 'torture.2015.10.06a' into HEAD

2015-10-07 16:06:25 -07:00

sched/cputime: fix a deadlock on 32bit systems

2016-03-23 20:02:39 -07:00

sched: do not set window until sched_clock is fully initialized

2016-03-23 20:01:06 -07:00

sched: add affinity, task load information to sched tracepoints

2016-03-23 19:59:31 -07:00

.gitignore

certs: add .gitignore to stop git nagging about x509_certificate_list

2015-10-21 15:18:35 +01:00

acct.c

…

async.c

…

audit_fsnotify.c

audit: clean simple fsnotify implementation

2015-08-06 16:14:53 -04:00

audit_tree.c

audit: audit_tree_match can be boolean

2015-11-04 08:23:51 -05:00

audit_watch.c

Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit

2015-09-08 13:34:59 -07:00

audit.c

mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd

2015-11-06 17:50:42 -08:00

audit.h

audit: audit_tree_match can be boolean

2015-11-04 08:23:51 -05:00

auditfilter.c

audit: fix comment block whitespace

2015-11-04 08:23:51 -05:00

auditsc.c

Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit

2015-09-08 13:34:59 -07:00

backtracetest.c

…

bounds.c

…

capability.c

…

cgroup_freezer.c

cgroup: fix handling of multi-destination migration from subtree_control enabling

2015-12-03 10:18:21 -05:00

cgroup_pids.c

cgroup_pids: don't account for the root cgroup

2015-12-03 10:18:21 -05:00

cgroup.c

cgroup: refactor allow_attach handler for 4.4

2016-02-16 13:53:46 -08:00

compat.c

compat: cleanup coding in compat_get_bitmap() and compat_put_bitmap()

2015-06-04 23:57:18 +02:00

configs.c

…

context_tracking.c

context_tracking: avoid irq_save/irq_restore on guest entry and exit

2015-11-10 12:06:23 +01:00

cpu_pm.c

lpm-levels: Do not disable non-sec interrupts in suspend

2016-03-22 11:07:22 -07:00

cpu.c

tracing/sched: Add trace events to track cpu hotplug.

2016-02-16 13:53:29 -08:00

cpuset.c

cgroup: fix handling of multi-destination migration from subtree_control enabling

2015-12-03 10:18:21 -05:00

crash_dump.c

…

cred.c

kernel/cred.c: remove unnecessary kdebug atomic reads

2015-09-10 13:29:01 -07:00

delayacct.c

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dma.c

…

elfcore.c

…

exec_domain.c

…

exit.c

sched: window-stats: Fix exit race

2016-03-23 20:00:27 -07:00

extable.c

kernel/extable.c: remove duplicated include

2015-09-10 13:29:01 -07:00

fork.c

kernel: fork: Call KASan alloc before release the thread info pages

2016-03-22 11:10:44 -07:00

freezer.c

…

futex_compat.c

…

futex.c

Merge tag 'driver-core-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2015-11-04 21:50:37 -08:00

groups.c

…

hung_task.c

…

irq_work.c

treewide: Remove old email address

2015-11-23 09:44:58 +01:00

jump_label.c

treewide: Remove old email address

2015-11-23 09:44:58 +01:00

kallsyms.c

…

kcmp.c

…

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

…

Kconfig.preempt

…

kexec_core.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kexec_file.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kexec_internal.h

kexec: split kexec_file syscall code to kexec_file.c

2015-09-10 13:29:01 -07:00

kexec.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kmod.c

kmod: don't run async usermode helper as a child of kworker thread

2015-10-23 17:55:10 +09:00

kprobes.c

perf/x86/hw_breakpoints: Disallow kernel breakpoints unless kprobe-safe

2015-08-04 10:16:54 +02:00

ksysfs.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

kthread.c

kernel/kthread.c:kthread_create_on_node(): clarify documentation

2015-09-04 16:54:41 -07:00

latencytop.c

…

Makefile

sys_membarrier(): system-wide memory barrier (generic, x86)

2015-09-11 15:21:34 -07:00

membarrier.c

sys_membarrier(): system-wide memory barrier (generic, x86)

2015-09-11 15:21:34 -07:00

memremap.c

Merge tag 'libnvdimm-for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

2015-11-10 12:07:22 -08:00

module_signing.c

KEYS: Merge the type-specific data with the payload data

2015-10-21 15:18:36 +01:00

module-internal.h

…

module.c

ftrace/module: Call clean up function when module init fails early

2016-01-07 12:17:39 -05:00

notifier.c

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-09-01 08:40:25 -07:00

nsproxy.c

…

padata.c

…

panic.c

panic: Add board ID to panic output

2016-02-16 13:54:02 -08:00

params.c

Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2015-11-09 15:53:39 -08:00

pid_namespace.c

…

pid.c

pidns: fix NULL dereference in __task_pid_nr_ns()

2015-11-24 12:03:55 -08:00

profile.c

mm: rename alloc_pages_exact_node() to __alloc_pages_node()

2015-09-08 15:35:28 -07:00

ptrace.c

seccomp, ptrace: add support for dumping seccomp filters

2015-10-27 19:55:13 -07:00

range.c

…

reboot.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

relay.c

kernel/relay.c: use kvfree() in relay_free_page_array()

2015-06-30 19:44:59 -07:00

resource.c

mm: enhance region_is_ram() to region_intersects()

2015-08-10 23:07:05 -04:00

seccomp.c

seccomp, ptrace: add support for dumping seccomp filters

2015-10-27 19:55:13 -07:00

signal.c

kernel/signal.c: unexport sigsuspend()

2015-11-20 16:17:32 -08:00

smp.c

smp: Allow booting a specific subset of CPUs

2016-03-22 11:07:48 -07:00

smpboot.c

stop_machine: Kill smp_hotplug_thread->pre_unpark, introduce stop_machine_unpark()

2015-10-20 10:23:55 +02:00

smpboot.h

…

softirq.c

…

stacktrace.c

…

stop_machine.c

kernel: remove stop_machine() Kconfig dependency

2015-12-12 10:15:34 -08:00

sys_ni.c

mm: mlock: add new mlock system call

2015-11-05 19:34:48 -08:00

sys.c

mm: private anonymous memory build fixes for 4.4

2016-02-16 13:54:13 -08:00

sysctl_binary.c

net/ipv6/addrconf: IPv6 tethering enhancement

2016-03-22 11:09:54 -07:00

sysctl.c

sched: Notify cpufreq governor early about potential big tasks

2016-03-23 20:02:34 -07:00

task_work.c

task_work: remove fifo ordering guarantee

2015-09-05 13:46:58 -07:00

taskstats.c

…

test_kprobes.c

…

torture.c

torture: Consolidate cond_resched_rcu_qs() into stutter_wait()

2015-10-06 11:25:01 -07:00

tracepoint.c

tracepoint: Give priority to probes of tracepoints

2015-10-25 21:33:54 -04:00

tsacct.c

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uid16.c

…

up.c

…

user_namespace.c

capabilities: ambient capabilities

2015-09-04 16:54:41 -07:00

user-return-notifier.c

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user.c

…

utsname_sysctl.c

…

utsname.c

…

watchdog.c

hardlockup: detect hard lockups without NMIs using secondary cpus

2016-02-16 13:54:19 -08:00

workqueue_internal.h

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workqueue.c

kernel/lib: add additional debug capabilites for data corruption

2016-03-22 11:16:29 -07:00