From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>

Remove the rmb() from mce_log(), since the immunized version of
rcu_dereference() makes it unnecessary.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/x86_64/kernel/mce.c |    3 ---
 1 files changed, 3 deletions(-)

diff -puN arch/x86_64/kernel/mce.c~remove-workaround-for-unimmunized-rcu_dereference-from-mce_log arch/x86_64/kernel/mce.c
--- a/arch/x86_64/kernel/mce.c~remove-workaround-for-unimmunized-rcu_dereference-from-mce_log
+++ a/arch/x86_64/kernel/mce.c
@@ -76,9 +76,6 @@ void mce_log(struct mce *mce)
 	wmb();
 	for (;;) {
 		entry = rcu_dereference(mcelog.next);
-		/* The rmb forces the compiler to reload next in each
-		    iteration */
-		rmb();
 		for (;;) {
 			/* When the buffer fills up discard new entries. Assume
 			   that the earlier errors are the more interesting. */
_