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arm64: stacktrace: use non-atomic __set_bit

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Use the non-atomic version of set_bit() in arch/arm64/kernel/stacktrace.c,
as there is no concurrent accesses to frame->prev_type.

This speeds up stack trace collection and improves the boot time of
Generic KASAN by 2-5%.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://lore.kernel.org/r/23dfa36d1cc91e4a1059945b7834eac22fb9854d.1653317461.git.andreyknvl@google.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Andrey Konovalov 2022-05-23 16:51:52 +02:00 committed by Will Deacon
parent 802b91118d
commit 446297b28a
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/stacktrace.c
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@ -117,7 +117,7 @@ static int notrace unwind_next(struct task_struct *tsk,
if (fp <= state->prev_fp)
return -EINVAL;
} else {
set_bit(state->prev_type, state->stacks_done);
__set_bit(state->prev_type, state->stacks_done);
}
/*