The patch titled
Subject: slab: replace smp_read_barrier_depends() with lockless_dereference()
has been added to the -mm tree. Its filename is
slab-replace-smp_read_barrier_depends-with-lockless_dereference.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/slab-replace-smp_read_barrier_depends-with-lockless_dereference.patch
echo and later at
echo http://ozlabs.org/~akpm/mmotm/broken-out/slab-replace-smp_read_barrier_depends-with-lockless_dereference.patch
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------------------------------------------------------
From: Pranith Kumar <bobby.prani@xxxxxxxxx>
Subject: slab: replace smp_read_barrier_depends() with lockless_dereference()
Recently lockless_dereference() was added which can be used in place of
hard-coding smp_read_barrier_depends(). The following PATCH makes the
change.
Signed-off-by: Pranith Kumar <bobby.prani@xxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slab.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff -puN mm/slab.h~slab-replace-smp_read_barrier_depends-with-lockless_dereference mm/slab.h
--- a/mm/slab.h~slab-replace-smp_read_barrier_depends-with-lockless_dereference
+++ a/mm/slab.h
@@ -209,15 +209,15 @@ cache_from_memcg_idx(struct kmem_cache *
rcu_read_lock();
params = rcu_dereference(s->memcg_params);
- cachep = params->memcg_caches[idx];
- rcu_read_unlock();
/*
* Make sure we will access the up-to-date value. The code updating
* memcg_caches issues a write barrier to match this (see
* memcg_register_cache()).
*/
- smp_read_barrier_depends();
+ cachep = lockless_dereference(params->memcg_caches[idx]);
+ rcu_read_unlock();
+
return cachep;
}
_
Patches currently in -mm which might be from bobby.prani@xxxxxxxxx are
slab-replace-smp_read_barrier_depends-with-lockless_dereference.patch
ksm-replace-smp_read_barrier_depends-with-lockless_dereference.patch
linux-next.patch
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