tree 253112e894c11c37a52ac93fe0f470fe990c2c18
parent 7d318d774789657c37a5e994a4a2cf59d4879ae7
author Mike Waychison <mikew@google.com> 1128031287 +0200
committer Linus Torvalds <torvalds@g5.osdl.org> 1128033702 -0700

[PATCH] x86_64: Fix mce_log

The attempt to fixup the lockless mce log buffer introduced an infinite loop
when trying to find a free entry.

And:

Using rcu_dereference() to load mcelog.next doesn't seem to be sufficient
enough to ensure that mcelog.next is loaded each time around the loop in
mce_log().  Instead, use an explicit rmb() to ensure that the compiler gets it
right.

AK: turned the smp_wmbs into true wmbs to make sure they are not
reordered by the compiler on UP.

Signed-off-by: Mike Waychison <mikew@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>