Commit 33b5881d authored Sep 11, 2015 by Christian Borntraeger Committed by Martin Schwidefsky Oct 14, 2015

s390/vdso: use correct memory barrier

By definition smp_wmb only orders writes against writes. (Finish all
previous writes, and do not start any future write). To protect the
vdso init code against early reads on other CPUs, let's use a full
smp_mb at the end of vdso init. As right now smp_wmb is implemented
as full serialization, this needs no stable backport, but this change
will be necessary if we reimplement smp_wmb.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent e0af21c5

arch/s390/kernel/vdso.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -299,7 +299,7 @@ static int __init vdso_init(void)

		get_page(virt_to_page(vdso_data));

		smp_wmb();
		smp_mb();

		return 0;
		}

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