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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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2
arch/sparc64/kernel/sbus.c
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@@ -147,7 +147,7 @@ static void sbus_strbuf_flush(struct sbus_iommu *iommu, u32 base, unsigned long
if (!limit)
break;
udelay(1);
membar("#LoadLoad");
rmb();
}
if (!limit)
printk(KERN_WARNING "sbus_strbuf_flush: flushflag timeout "