aboutsummaryrefslogtreecommitdiff
path: root/include/asm-sparc64/spinlock.h
diff options
context:
space:
mode:
authorDavid S. Miller <davem@davemloft.net>2005-08-29 12:46:22 -0700
committerDavid S. Miller <davem@davemloft.net>2005-08-29 12:46:22 -0700
commit4f07118f656c179740cad35b827032e2e29b1210 (patch)
tree7ddeb17346fe25ae75aa5373659c053afb9ef5f5 /include/asm-sparc64/spinlock.h
parent442464a50077ff00454ff8d7628cbe1b8eacc034 (diff)
downloadlinux-4f07118f656c179740cad35b827032e2e29b1210.tar.gz
[SPARC64]: More fully work around Spitfire Errata 51.
It appears that a memory barrier soon after a mispredicted branch, not just in the delay slot, can cause the hang condition of this cpu errata. So move them out-of-line, and explicitly put them into a "branch always, predict taken" delay slot which should fully kill this problem. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64/spinlock.h')
-rw-r--r--include/asm-sparc64/spinlock.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-sparc64/spinlock.h b/include/asm-sparc64/spinlock.h
index d265bf6570f..a02c4370eb4 100644
--- a/include/asm-sparc64/spinlock.h
+++ b/include/asm-sparc64/spinlock.h
@@ -43,7 +43,7 @@ typedef struct {
#define spin_is_locked(lp) ((lp)->lock != 0)
#define spin_unlock_wait(lp) \
-do { membar("#LoadLoad"); \
+do { rmb(); \
} while((lp)->lock)
static inline void _raw_spin_lock(spinlock_t *lock)
@@ -129,7 +129,7 @@ typedef struct {
#define spin_is_locked(__lock) ((__lock)->lock != 0)
#define spin_unlock_wait(__lock) \
do { \
- membar("#LoadLoad"); \
+ rmb(); \
} while((__lock)->lock)
extern void _do_spin_lock(spinlock_t *lock, char *str, unsigned long caller);