From 3795f46b83c66a2e4545460dec74c80b839faafe Mon Sep 17 00:00:00 2001 From: Christophe JAILLET Date: Fri, 14 Jan 2022 14:05:26 -0800 Subject: [PATCH] mm/frontswap.c: use non-atomic '__set_bit()' when possible The 'a' and 'b' bitmaps are local to this function, so no concurrent access can occur. So the non-atomic '__set_bit()' can be used to save a few cycles. Link: https://lkml.kernel.org/r/e52476da5cee57151745c5c3c934a69798dc6fa4.1638132190.git.christophe.jaillet@wanadoo.fr Signed-off-by: Christophe JAILLET Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/frontswap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/frontswap.c b/mm/frontswap.c index 130e301c5ac0..6bed12260dea 100644 --- a/mm/frontswap.c +++ b/mm/frontswap.c @@ -127,7 +127,7 @@ void frontswap_register_ops(struct frontswap_ops *ops) spin_lock(&swap_lock); plist_for_each_entry(si, &swap_active_head, list) { if (!WARN_ON(!si->frontswap_map)) - set_bit(si->type, a); + __set_bit(si->type, a); } spin_unlock(&swap_lock); @@ -149,7 +149,7 @@ void frontswap_register_ops(struct frontswap_ops *ops) spin_lock(&swap_lock); plist_for_each_entry(si, &swap_active_head, list) { if (si->frontswap_map) - set_bit(si->type, b); + __set_bit(si->type, b); } spin_unlock(&swap_lock); -- 2.25.1