powerpc: Fix corruption when grabbing FWNMI data

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The FWNMI code uses a global buffer without any locks to read the RTAS error
information. If two CPUs take a machine check at once then we will corrupt
this buffer.

Since most FWNMI rtas messages are not of the extended type, we can create a
64bit percpu buffer and use it where possible. If we do receive an extended
RTAS log then we fall back to the old behaviour of using the global buffer.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Anton Blanchard 2011-01-11 19:50:51 +00:00 • committed by Benjamin Herrenschmidt

parent d47d1d8af5

commit d368514c30

1 changed files with 38 additions and 14 deletions

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54

arch/powerpc/platforms/pseries/ras.c

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