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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 /arch/sparc64/solaris
parent442464a50077ff00454ff8d7628cbe1b8eacc034 (diff)
[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 'arch/sparc64/solaris')
-rw-r--r--arch/sparc64/solaris/misc.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/sparc64/solaris/misc.c b/arch/sparc64/solaris/misc.c
index 15b4cfe0755..302efbcba70 100644
--- a/arch/sparc64/solaris/misc.c
+++ b/arch/sparc64/solaris/misc.c
@@ -737,7 +737,8 @@ MODULE_LICENSE("GPL");
extern u32 tl0_solaris[8];
#define update_ttable(x) \
tl0_solaris[3] = (((long)(x) - (long)tl0_solaris - 3) >> 2) | 0x40000000; \
- __asm__ __volatile__ ("membar #StoreStore; flush %0" : : "r" (&tl0_solaris[3]))
+ wmb(); \
+ __asm__ __volatile__ ("flush %0" : : "r" (&tl0_solaris[3]))
#else
#endif
@@ -761,7 +762,8 @@ int init_module(void)
entry64_personality_patch |=
(offsetof(struct task_struct, personality) +
(sizeof(unsigned long) - 1));
- __asm__ __volatile__("membar #StoreStore; flush %0"
+ wmb();
+ __asm__ __volatile__("flush %0"
: : "r" (&entry64_personality_patch));
return 0;
}