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jump_label: Do not profile branch annotations

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While running my branch profiler that checks for incorrect "likely" and
"unlikely"s around the kernel, there's a large number of them that are
incorrect due to being "static_branches".

As static_branches are rather special, as they are likely or unlikely for
other reasons than normal annotations are used for, there's no reason to
have them be profiled.

Expose the "unlikely_notrace" and "likely_notrace" so that the
static_branch can use them, and have them be ignored by the branch
profilers.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201211163754.585174b9@gandalf.local.home
This commit is contained in:
Steven Rostedt (VMware) 2020-12-11 16:37:54 -05:00 • committed by Peter Zijlstra
parent c753925814
commit 2f0df49c89
2 changed files with 8 additions and 6 deletions
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2
include/linux/compiler.h
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@ -76,6 +76,8 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#else
# define likely(x) __builtin_expect(!!(x), 1)
# define unlikely(x) __builtin_expect(!!(x), 0)
# define likely_notrace(x) likely(x)
# define unlikely_notrace(x) unlikely(x)
#endif
/* Optimization barrier */