From: Andrey Konovalov <andreyknvl@xxxxxxxxxx> [ Upstream commit 446297b28a21244e4045026c4599d1b14a67e2ce ] 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@xxxxxxx> Acked-by: Mark Rutland <mark.rutland@xxxxxxx> Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Link: https://lore.kernel.org/r/23dfa36d1cc91e4a1059945b7834eac22fb9854d.1653317461.git.andreyknvl@xxxxxxxxxx Signed-off-by: Will Deacon <will@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- arch/arm64/kernel/stacktrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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); } /* -- 2.35.1
