[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>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/asm-sparc64/spinlock.h b/include/asm-sparc64/spinlock.h
index d265bf6570fe..a02c4370eb42 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);