The patch titled
Subject: mm/vmalloc.c: fix memory ordering bug
has been added to the -mm tree. Its filename is
fix-memory-ordering-bug-in-mm-vmallocc.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fix-memory-ordering-bug-in-mm-vmallocc.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fix-memory-ordering-bug-in-mm-vmallocc.patch
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------------------------------------------------------
From: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Subject: mm/vmalloc.c: fix memory ordering bug
Read memory barriers must follow the read operations.
Signed-off-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN mm/vmalloc.c~fix-memory-ordering-bug-in-mm-vmallocc mm/vmalloc.c
--- a/mm/vmalloc.c~fix-memory-ordering-bug-in-mm-vmallocc
+++ a/mm/vmalloc.c
@@ -2574,10 +2574,10 @@ static void show_numa_info(struct seq_fi
if (!counters)
return;
- /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
- smp_rmb();
if (v->flags & VM_UNINITIALIZED)
return;
+ /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
+ smp_rmb();
memset(counters, 0, nr_node_ids * sizeof(unsigned int));
_
Patches currently in -mm which might be from dvyukov@xxxxxxxxxx are
fix-memory-ordering-bug-in-mm-vmallocc.patch
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