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| author | Will Deacon <will.deacon@arm.com> | 2017-10-24 11:22:48 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-25 14:26:21 +0100 |
| commit | 5383f45db38c0459f8d3d3f90f7f0a132ad104f3 (patch) | |
| tree | a478538397b4664a705258fe54f2896941e45132 /mm | |
| parent | 1aedecaf12a67de999eaf233cdb64839170ca035 (diff) | |
| download | linux-stable-5383f45db38c0459f8d3d3f90f7f0a132ad104f3.tar.gz linux-stable-5383f45db38c0459f8d3d3f90f7f0a132ad104f3.tar.bz2 linux-stable-5383f45db38c0459f8d3d3f90f7f0a132ad104f3.zip | |
locking/barriers: Convert users of lockless_dereference() to READ_ONCE()
commit 3382290ed2d5e275429cef510ab21889d3ccd164 upstream.
[ Note, this is a Git cherry-pick of the following commit:
506458efaf15 ("locking/barriers: Convert users of lockless_dereference() to READ_ONCE()")
... for easier x86 PTI code testing and back-porting. ]
READ_ONCE() now has an implicit smp_read_barrier_depends() call, so it
can be used instead of lockless_dereference() without any change in
semantics.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1508840570-22169-4-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slab.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab.h b/mm/slab.h index 028cdc7df67e..86d7c7d860f9 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -259,7 +259,7 @@ cache_from_memcg_idx(struct kmem_cache *s, int idx) * memcg_caches issues a write barrier to match this (see * memcg_create_kmem_cache()). */ - cachep = lockless_dereference(arr->entries[idx]); + cachep = READ_ONCE(arr->entries[idx]); rcu_read_unlock(); return cachep; |