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| author | Anton Blanchard <anton@samba.org> | 2011-01-11 20:50:51 +0100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-01-21 04:08:38 +0100 |
| commit | d368514c3097a48a109b6ba64e12047106c7473d (patch) | |
| tree | bdd892bec071fc042f70c1875642175cbcc782cb /arch/powerpc/kernel/rtasd.c | |
| parent | powerpc: Rework pseries machine check handler (diff) | |
| download | linux-d368514c3097a48a109b6ba64e12047106c7473d.tar.xz linux-d368514c3097a48a109b6ba64e12047106c7473d.zip | |
powerpc: Fix corruption when grabbing FWNMI data
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>
Diffstat (limited to 'arch/powerpc/kernel/rtasd.c')
0 files changed, 0 insertions, 0 deletions