ring_buffer: Use try_cmpxchg instead of cmpxchg

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Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old in
ring_buffer.c. x86 CMPXCHG instruction returns success in ZF flag,
so this change saves a compare after cmpxchg (and related move
instruction in front of cmpxchg).

No functional change intended.

Link: https://lore.kernel.org/linux-trace-kernel/20230714154418.8884-1-ubizjak@gmail.com

Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

...

This commit is contained in:

Uros Bizjak 2023-07-14 17:43:34 +02:00 • committed by Steven Rostedt (Google)

parent e7186af7fb

commit 00a8478f8f

1 changed files with 6 additions and 14 deletions

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kernel/trace/ring_buffer.c

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