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powerpc: Add write barrier before enabling DTL flags

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Currently, we don't enforce any ordering for updates to the lppaca
when enabling dtl logging, so we may end up enabling logging before the
index fields have been established.

This change adds a smp_wmb() before doing the actual enable.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Jeremy Kerr 2009-03-23 16:55:08 +00:00 committed by Benjamin Herrenschmidt
parent 757c74d298
commit 82631f5dd1
1 changed files with 4 additions and 0 deletions
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arch/powerpc/platforms/pseries/dtl.c
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@ -107,6 +107,10 @@ static int dtl_enable(struct dtl *dtl)
/* set our initial buffer indices */
dtl->last_idx = lppaca[dtl->cpu].dtl_idx = 0;
/* ensure that our updates to the lppaca fields have occurred before
* we actually enable the logging */
smp_wmb();
/* enable event logging */
lppaca[dtl->cpu].dtl_enable_mask = dtl_event_mask;