s390/cmpxchg: select HAVE_CMPXCHG_LOCAL option

Now that hopefully all cmpxchg/xchg bugs have been fixed select
HAVE_CMPXCHG_LOCAL option which uncovered a couple of bugs on s390.

The only call site which is affected seems to be within mm/vmstat.c.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index e16390c..57c86da 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -93,6 +93,7 @@ config S390
        select ARCH_SAVE_PAGE_KEYS if HIBERNATION
        select HAVE_MEMBLOCK
        select HAVE_MEMBLOCK_NODE_MAP
+       select HAVE_CMPXCHG_LOCAL
        select ARCH_DISCARD_MEMBLOCK
        select ARCH_INLINE_SPIN_TRYLOCK
        select ARCH_INLINE_SPIN_TRYLOCK_BH