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mm/vmalloc.c: fix memory ordering bug 

Read memory barriers must follow the read operations.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitry Vyukov 2014-12-12 16:56:30 -08:00 committed by Linus Torvalds
parent 6a2d5679b4
commit 7e5b528b4c
1 changed files with 2 additions and 2 deletions
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4
mm/vmalloc.c
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@ -2574,10 +2574,10 @@ static void show_numa_info(struct seq_file *m, struct vm_struct *v)
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));