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authorRichard Earnshaw <rearnsha@arm.com>2009-12-03 14:26:46 +0000
committerRichard Earnshaw <rearnsha@gcc.gnu.org>2009-12-03 14:26:46 +0000
commitcf9eb56580e4ebabff35cfa5484ece3c86f1120c (patch)
treecee4c3991885f7b08b311be973bc810a20c2b461 /gcc/config/arm/linux-atomic.c
parentbcaf576b83e0c2332c2f78acb5ec7d060fdbab46 (diff)
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linux-atomic.c (SYNC_LOCK_RELEASE): Place memory barrier before the lock release.
* arm/linux-atomic.c (SYNC_LOCK_RELEASE): Place memory barrier before the lock release. From-SVN: r154949
Diffstat (limited to 'gcc/config/arm/linux-atomic.c')
-rw-r--r--gcc/config/arm/linux-atomic.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/config/arm/linux-atomic.c b/gcc/config/arm/linux-atomic.c
index 14d4a53..20ad296 100644
--- a/gcc/config/arm/linux-atomic.c
+++ b/gcc/config/arm/linux-atomic.c
@@ -266,8 +266,10 @@ SUBWORD_TEST_AND_SET (char, 1)
void HIDDEN \
__sync_lock_release_##WIDTH (TYPE *ptr) \
{ \
- *ptr = 0; \
+ /* All writes before this point must be seen before we release \
+ the lock itself. */ \
__kernel_dmb (); \
+ *ptr = 0; \
}
SYNC_LOCK_RELEASE (int, 4)