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Will Deacon 1001d2fde4 locking/barriers: Introduce smp_cond_load_relaxed() and atomic_cond_read_relaxed() 
Whilst we currently provide smp_cond_load_acquire() and
atomic_cond_read_acquire(), there are cases where the ACQUIRE semantics are
not required because of a subsequent fence or release operation once the
conditional loop has exited.

This patch adds relaxed versions of the conditional spinning primitives
to avoid unnecessary barrier overhead on architectures such as arm64.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Waiman Long <longman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: boqun.feng@gmail.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1524738868-31318-2-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: kdrag0n <dragon@khronodragon.com>
Signed-off-by: Danny Lin <danny@kdrag0n.dev>
Change-Id: I389a995ba3a350c45b12a8a4e553e85b0a49280a
Signed-off-by: SamarV-121 <samarvispute121@pm.me>
2023-10-16 15:31:57 +00:00
..
bitops
bitops: Do not default to __clear_bit() for __clear_bit_unlock()
2016-03-21 10:50:48 +01:00
4level-fixup.h
mm, asm-generic: define PUD_SHIFT in <asm-generic/4level-fixup.h>
2015-02-11 17:06:03 -08:00
asm-offsets.h
asm-generic: Add common asm-offsets.h
2015-06-23 13:35:49 +09:00
asm-prototypes.h
asm-prototypes: Clear any CPP defines before declaring the functions
2017-01-12 11:39:07 +01:00
atomic64.h
locking/atomic: Implement atomic{,64,_long}_fetch_{add,sub,and,andnot,or,xor}{,_relaxed,_acquire,_release}()
2016-06-16 10:48:32 +02:00
atomic-long.h
locking/barriers: Introduce smp_cond_load_relaxed() and atomic_cond_read_relaxed()
2023-10-16 15:31:57 +00:00
atomic.h
locking/atomic: Remove linux/atomic.h:atomic_fetch_or()
2016-06-16 10:48:32 +02:00
audit_change_attr.h
…
audit_dir_write.h
…
audit_read.h
…
audit_signal.h
…
audit_write.h
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barrier.h
locking/barriers: Introduce smp_cond_load_relaxed() and atomic_cond_read_relaxed()
2023-10-16 15:31:57 +00:00
bitops.h
…
bitsperlong.h
…
bug.h
bug.h: work around GCC PR82365 in BUG()
2019-07-10 09:55:44 +02:00
bugs.h
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cache.h
…
cacheflush.h
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checksum.h
ipv4: Update parameters for csum_tcpudp_magic to their original types
2016-03-13 23:55:13 -04:00
clkdev.h
asm-generic: COMMON_CLK defines __clk_{get,put}
2014-09-25 18:00:45 -07:00
cmpxchg-local.h
…
cmpxchg.h
asm-generic: cmpxchg: avoid warnings from macro-ized cmpxchg() implementations
2015-10-15 00:21:13 +02:00
cputime_jiffies.h
sched, time: Fix build error with 64 bit cputime_t on 32 bit systems
2014-10-03 05:46:55 +02:00
cputime_nsecs.h
sched/cputime: Count actually elapsed irq & softirq time
2016-07-14 10:42:34 +02:00
cputime.h
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current.h
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delay.h
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device.h
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div64.h
__div64_32(): make it overridable at compile time
2015-11-16 14:42:12 -05:00
dma-contiguous.h
asm-generic: Add dma-contiguous.h
2014-09-22 13:35:51 +02:00
dma.h
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early_ioremap.h
Merge branch 'akpm' (patches from Andrew)
2015-09-08 17:52:23 -07:00
emergency-restart.h
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exec.h
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export.h
Revert "default exported asm symbols to zero"
2016-12-07 08:39:00 -08:00
fb.h
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fixmap.h
asm-generic: Fix local variable shadow in __set_fixmap_offset
2016-02-16 15:10:44 +00:00
ftrace.h
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futex.h
futex: Remove duplicated code and fix undefined behaviour
2018-05-19 10:27:00 +02:00
getorder.h
asm-generic: fix -Wtype-limits compiler warnings
2019-08-25 10:51:50 +02:00
gpio.h
gpio: allow setting ARCH_NR_GPIOS from Kconfig
2016-02-19 00:22:54 +01:00
hardirq.h
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hugetlb.h
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hw_irq.h
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ide_iops.h
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int-ll64.h
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io.h
asm-generic/io.h: add io{read,write}64 accessors
2016-05-31 16:41:50 +08:00
ioctl.h
include/asm-generic/ioctl.h: fix _IOC_TYPECHECK sparse error
2014-06-06 16:08:13 -07:00
iomap.h
asm-generic/io.h: add io{read,write}64 accessors
2016-05-31 16:41:50 +08:00
irq_regs.h
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irq_work.h
irq_work: Introduce arch_irq_work_has_interrupt()
2014-09-13 18:38:07 +02:00
irq.h
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irqflags.h
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kdebug.h
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kmap_types.h
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kvm_para.h
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linkage.h
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local64.h
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local.h
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mcs_spinlock.h
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memory_model.h
mm: add PHYS_PFN, use it in __phys_to_pfn()
2016-01-14 16:00:49 -08:00
mm_hooks.h
mm/core, x86/mm/pkeys: Differentiate instruction fetches
2016-02-18 19:46:29 +01:00
mm-arch-hooks.h
mm: clean up per architecture MM hook header files
2015-07-17 16:39:53 -07:00
mmu_context.h
asm-generic: Remove asm-generic arch_bprm_mm_init()
2014-11-22 21:52:08 +01:00
mmu.h
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module.h
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msi.h
asm-generic: Add msi.h
2014-11-23 13:01:47 +01:00
mutex-dec.h
locking/mutex: Optimize mutex_trylock() fast-path
2016-06-08 15:17:01 +02:00
mutex-null.h
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mutex-xchg.h
locking/mutex: Optimize mutex_trylock() fast-path
2016-06-08 15:17:01 +02:00
mutex.h
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okl4_virq.h
aarch64: add core okl4 hypervisor config
2018-11-28 23:42:02 -08:00
page.h
asm-generic: page.h: Remove useless get_user_page and free_user_page
2016-02-26 15:24:55 +01:00
param.h
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parport.h
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pci_iomap.h
PCI: Add pci_iomap_wc() variants
2015-08-25 09:59:45 +02:00
pci.h
PCI: Remove unused pcibios_select_root() (again)
2015-06-08 07:56:21 -05:00
percpu.h
percpu: make this_cpu_generic_read() atomic w.r.t. interrupts
2017-10-12 11:51:23 +02:00
pgalloc.h
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pgtable-nopmd.h
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pgtable-nopud.h
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pgtable.h
arch: pgtable: define MAX_POSSIBLE_PHYSMEM_BITS where needed
2021-11-12 13:18:01 +01:00
preempt.h
sched/preempt: Fix preempt_count manipulations
2016-05-17 12:24:21 +02:00
ptrace.h
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qrwlock_types.h
locking/qrwlock: Prevent slowpath writers getting held up by fastpath
2018-06-25 03:25:29 -07:00
qrwlock.h
locking/qrwlock: Prevent slowpath writers getting held up by fastpath
2018-06-25 03:25:29 -07:00
qspinlock_types.h
locking/qspinlock: Pull in asm/byteorder.h to ensure correct endianness
2019-01-26 09:38:36 +01:00
qspinlock.h
locking/qspinlock: Use atomic_sub_return_release() in queued_spin_unlock()
2016-06-08 15:17:01 +02:00
resource.h
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rwsem.h
locking/rwsem: Remove rwsem_atomic_add() and rwsem_atomic_update()
2016-06-08 15:16:59 +02:00
seccomp.h
seccomp: Get compat syscalls from asm-generic header
2016-05-13 14:02:00 +02:00
sections.h
Merge 4.9.327 into android-4.9-q
2022-09-05 14:02:59 +02:00
segment.h
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serial.h
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siginfo.h
SIGNAL: Move generic copy_siginfo() to signal.h
2016-05-13 14:02:10 +02:00
signal.h
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simd.h
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sizes.h
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spinlock.h
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statfs.h
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string.h
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switch_to.h
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syscall.h
syscall.h: fix doc text for syscall_get_arch()
2014-09-23 16:20:00 -04:00
syscalls.h
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termios-base.h
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termios.h
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timex.h
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tlb.h
mm/khugepaged: fix GUP-fast interaction by sending IPI
2023-01-07 12:07:10 +01:00
tlbflush.h
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topology.h
include/asm-generic/topology.h: guard cpumask_of_node() macro argument
2020-06-03 08:16:42 +02:00
trace_clock.h
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uaccess-unaligned.h
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uaccess.h
exceptions: detritus removal
2016-09-27 21:15:14 -04:00
unaligned.h
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unistd.h
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user.h
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vga.h
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vmlinux.lds.h
Merge 4.9.281 into android-4.9-q
2021-08-27 14:37:08 +02:00
vtime.h
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word-at-a-time.h
Make asm/word-at-a-time.h available on all architectures
2015-07-08 16:41:55 -04:00
xor.h
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