ring_buffer: Use try_cmpxchg instead of cmpxchg in rb_insert_pages
Use try_cmpxchg instead of cmpxchg (*ptr, old, new) == old in rb_insert_pages. 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/20230914163420.12923-1-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>
parent
a1f157c7
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