From: Andrey Konovalov andreyknvl@google.com
[ 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@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.165331746... Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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); }
/*