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mm/frontswap.c: use non-atomic '__set_bit()' when possible

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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 <christophe.jaillet@wanadoo.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christophe JAILLET 2022-01-14 14:05:26 -08:00 committed by Linus Torvalds
parent 62c9827cbb
commit 3795f46b83
1 changed files with 2 additions and 2 deletions
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4
mm/frontswap.c
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@ -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);