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| author | David S. Miller <davem@davemloft.net> | 2005-08-29 23:46:22 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-08-29 23:46:22 +0400 |
| commit | 4f07118f656c179740cad35b827032e2e29b1210 (patch) | |
| tree | 7ddeb17346fe25ae75aa5373659c053afb9ef5f5 /include/asm-sparc64/spinlock.h | |
| parent | 442464a50077ff00454ff8d7628cbe1b8eacc034 (diff) | |
| download | linux-4f07118f656c179740cad35b827032e2e29b1210.tar.xz | |
[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.h | 4 |
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); |