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| author | David S. Miller <davem@davemloft.net> | 2005-08-29 12:46:22 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-08-29 12:46:22 -0700 |
| commit | 4f07118f656c179740cad35b827032e2e29b1210 (patch) | |
| tree | 7ddeb17346fe25ae75aa5373659c053afb9ef5f5 /arch/sparc64/kernel/sbus.c | |
| parent | 442464a50077ff00454ff8d7628cbe1b8eacc034 (diff) | |
| download | linux-4f07118f656c179740cad35b827032e2e29b1210.tar.bz2 | |
[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/kernel/sbus.c')
| -rw-r--r-- | arch/sparc64/kernel/sbus.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/sbus.c b/arch/sparc64/kernel/sbus.c index 89f5e019f24c..e09ddf927655 100644 --- a/arch/sparc64/kernel/sbus.c +++ b/arch/sparc64/kernel/sbus.c @@ -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 " |