x86/smp: Use atomic_try_cmpxchg in native_stop_other_cpus()

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Use atomic_try_cmpxchg() instead of atomic_cmpxchg(*ptr, old, new) == old.

X86 CMPXCHG instruction returns success in ZF flag, so this change saves a
compare after the CMPXCHG.

Tested by building a native Fedora-38 kernel and rebooting
a 12-way SMP system using "shutdown -r" command some 100 times.

No functional change intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231123203605.3474745-2-ubizjak@gmail.com

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Uros Bizjak 2023-11-23 21:34:23 +01:00 • committed by Ingo Molnar

parent 9d1c8f2153

commit 9e9d673b2c

1 changed files with 3 additions and 2 deletions

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arch/x86/kernel/smp.c

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