[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>
diff --git a/arch/sparc64/solaris/misc.c b/arch/sparc64/solaris/misc.c
index 15b4cfe..302efbc 100644
--- a/arch/sparc64/solaris/misc.c
+++ b/arch/sparc64/solaris/misc.c
@@ -737,7 +737,8 @@
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 @@
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;
}