Commit 7e5b528b authored Dec 12, 2014 by Dmitry Vyukov Committed by Linus Torvalds Dec 13, 2014

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>

parent 6a2d5679

mm/vmalloc.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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));