x86/percpu: Optimize raw_cpu_xchg()

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Since raw_cpu_xchg() doesn't need to be IRQ-safe, like
this_cpu_xchg(), we can use a simple load-store instead of the cmpxchg
loop.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Peter Zijlstra 2019-02-27 11:09:56 +01:00 • committed by Ingo Molnar

parent 8dc2d993cf

commit 2234a6d3a2

1 changed files with 16 additions and 4 deletions

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arch/x86/include/asm/percpu.h

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