* [PATCH] mm/mempool: Use non-atomic '__set_bit()' when possible
@ 2021-11-28 20:52 Christophe JAILLET
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From: Christophe JAILLET @ 2021-11-28 20:52 UTC (permalink / raw)
To: konrad.wilk, akpm; +Cc: linux-kernel, kernel-janitors, Christophe JAILLET
the 'a' and 'b' bitmap 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.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
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);
--
2.30.2
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2021-11-28 20:52 [PATCH] mm/mempool: Use non-atomic '__set_bit()' when possible Christophe JAILLET
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