Commit 446297b2 authored by Andrey Konovalov's avatar Andrey Konovalov Committed by Will Deacon
Browse files

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: default avatarMark Rutland <mark.rutland@arm.com>
Acked-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Link: https://lore.kernel.org/r/23dfa36d1cc91e4a1059945b7834eac22fb9854d.1653317461.git.andreyknvl@google.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 802b9111

arch/arm64/kernel/stacktrace.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

	}



	/*