]> git.karo-electronics.de Git - linux-beck.git/commit
s390/vdso: use correct memory barrier
authorChristian Borntraeger <borntraeger@de.ibm.com>
Fri, 11 Sep 2015 14:23:06 +0000 (16:23 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Wed, 14 Oct 2015 12:32:01 +0000 (14:32 +0200)
commit33b5881d11c5d852662efb764f5054347296a062
tree207368e7cb03f9b3a19f48b4d9a13d64c89d593a
parente0af21c56ddd592b33f74f986a2cb4478b10786e
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>
arch/s390/kernel/vdso.c