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[SPARC64]: More fully work around Spitfire Errata 51.

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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>
This commit is contained in:
David S. Miller
2005-08-29 12:46:22 -07:00
parent 442464a500
commit 4f07118f65
14 changed files with 143 additions and 54 deletions
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9
arch/sparc64/kernel/sparc64_ksyms.c
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@@ -406,3 +406,12 @@ EXPORT_SYMBOL(xor_vis_4);
EXPORT_SYMBOL(xor_vis_5);
EXPORT_SYMBOL(prom_palette);
/* memory barriers */
EXPORT_SYMBOL(mb);
EXPORT_SYMBOL(rmb);
EXPORT_SYMBOL(wmb);
EXPORT_SYMBOL(membar_storeload);
EXPORT_SYMBOL(membar_storeload_storestore);
EXPORT_SYMBOL(membar_storeload_loadload);
EXPORT_SYMBOL(membar_storestore_loadstore);