[POWERPC] Fix PMU + soft interrupt disable bug

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Since the PMU is an NMI now, it can come at any time we are only soft
disabled.  We must hard disable around the two places we allow the kernel
stack SLB and r1 to go out of sync.  Otherwise the PMU exception can
force a kernel stack SLB into another slot, which can lead to it
getting evicted, which can lead to a nasty unrecoverable SLB miss
in the exception entry code.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

...

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Anton Blanchard 2008-03-17 15:27:09 +11:00 • committed by Paul Mackerras

parent c2372eb9bc

commit 44387e9ff2

2 changed files with 12 additions and 0 deletions

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6

arch/powerpc/kernel/process.c

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6

arch/powerpc/mm/slb.c

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