Commit "mm/slub: optimize alloc/free fastpath by removing preemption on/off"
has added access to percpu memory while the code is preemptible.
While those accesses are okay, this creates a huge amount of warnings from
the code that checks for that.
Signed-off-by: Sasha Levin <sasha.le...@oracle.com>
---
mm/slub.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index 907fabe..9b72b9c 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2431,8 +2431,8 @@ redo:
* to check if it is matched or not.
*/
do {
- tid = this_cpu_read(s->cpu_slab->tid);
- c = this_cpu_ptr(s->cpu_slab);
+ tid = raw_cpu_read(s->cpu_slab->tid);
+ c = raw_cpu_ptr(s->cpu_slab);
} while (IS_ENABLED(CONFIG_PREEMPT) && unlikely(tid != c->tid));
/*
@@ -2700,8 +2700,8 @@ redo:
* during the cmpxchg then the free will succedd.
*/
do {
- tid = this_cpu_read(s->cpu_slab->tid);
- c = this_cpu_ptr(s->cpu_slab);
+ tid = raw_cpu_read(s->cpu_slab->tid);
+ c = raw_cpu_ptr(s->cpu_slab);
} while (IS_ENABLED(CONFIG_PREEMPT) && unlikely(tid != c->tid));
/* Same with comment on barrier() in slab_alloc_node() */
--
1.7.10.4
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