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| author | Andrey Konovalov <andreyknvl@google.com> | 2022-05-23 16:51:52 +0200 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-06-23 15:57:29 +0100 |
| commit | 446297b28a21244e4045026c4599d1b14a67e2ce (patch) | |
| tree | c61440ee70734b2bbd0c09b9786f25ad5154e812 | |
| parent | 802b91118d11227b527153849ea761b280691373 (diff) | |
| download | lwn-446297b28a21244e4045026c4599d1b14a67e2ce.tar.gz lwn-446297b28a21244e4045026c4599d1b14a67e2ce.zip | |
arm64: stacktrace: use non-atomic __set_bit
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>
| -rw-r--r-- | arch/arm64/kernel/stacktrace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index c246e8d9f95b..d6bef106e37e 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -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); } /* |