The patch titled
Remove workaround for unimmunized rcu_dereference from mce_log()
has been added to the -mm tree. Its filename is
remove-workaround-for-unimmunized-rcu_dereference-from-mce_log.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Remove workaround for unimmunized rcu_dereference from mce_log()
From: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Remove the rmb() from mce_log(), since the immunized version of
rcu_dereference() makes it unnecessary.
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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. */
_
Patches currently in -mm which might be from paulmck@xxxxxxxxxxxxxxxxxx are
document-the-fact-that-rcu-callbacks-can-run-in-parallel.patch
immunize-rcu_dereference-against-crazy-compiler-writers.patch
remove-workaround-for-unimmunized-rcu_dereference-from-mce_log.patch
-
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