| commit | d368514c3097a48a109b6ba64e12047106c7473d | |
| author | Anton Blanchard <anton@samba.org> | |
| Tue, 11 Jan 2011 19:50:51 +0000 (11 19:50 +0000) | ||
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
| Fri, 21 Jan 2011 03:08:38 +0000 (21 14:08 +1100) | ||
| tree | bdd892bec071fc042f70c1875642175cbcc782cb | treesnapshot (tar.gz zip) |
| parent | d47d1d8af52e37bcf9059dd86878474e5ccc9c2a | commitdiff |
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>
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>
| arch/powerpc/platforms/pseries/ras.c | diffblobblamehistory |