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70ec04f348
Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old in update_used_max. x86 CMPXCHG instruction returns success in ZF flag, so this change saves a compare after cmpxchg (and related move instruction in front of cmpxchg). Also, reorder code a bit to remove additional compare and conditional jump from the assembly code. Together, hese two changes save 15 bytes from the function when compiled for x86_64. No functional change intended. Link: https://lkml.kernel.org/r/20221018145154.3699-1-ubizjak@gmail.com Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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