tree cc8c93fa1faf5e0b608e3a21330a32bd82fe6f47
parent 19d36ccdc34f5ed444f8a6af0cbfdb6790eb1177
author Andi Kleen <ak@suse.de> 1185095552 +0200
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1185127417 -0700

x86: Stop MCEs and NMIs during code patching

When a machine check or NMI occurs while multiple byte code is patched
the CPU could theoretically see an inconsistent instruction and crash.
Prevent this by temporarily disabling MCEs and returning early in the
NMI handler.

Based on discussion with Mathieu Desnoyers.

Cc: Mathieu Desnoyers <compudj@krystal.dyndns.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>