This is a note to let you know that I've just added the patch titled
mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From af2c1401e6f9177483be4fad876d0073669df9df Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@xxxxxxx>
Date: Wed, 18 Dec 2013 17:08:45 -0800
Subject: mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates
From: Mel Gorman <mgorman@xxxxxxx>
commit af2c1401e6f9177483be4fad876d0073669df9df upstream.
According to documentation on barriers, stores issued before a LOCK can
complete after the lock implying that it's possible tlb_flush_pending
can be visible after a page table update. As per revised documentation,
this patch adds a smp_mb__before_spinlock to guarantee the correct
ordering.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Acked-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/mm_types.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -478,7 +478,12 @@ static inline bool mm_tlb_flush_pending(
static inline void set_tlb_flush_pending(struct mm_struct *mm)
{
mm->tlb_flush_pending = true;
- barrier();
+
+ /*
+ * Guarantee that the tlb_flush_pending store does not leak into the
+ * critical section updating the page tables
+ */
+ smp_mb__before_spinlock();
}
/* Clearing is done after a TLB flush, which also provides a barrier. */
static inline void clear_tlb_flush_pending(struct mm_struct *mm)
Patches currently in stable-queue which might be from mgorman@xxxxxxx are
queue-3.12/sched-numa-skip-inaccessible-vmas.patch
queue-3.12/mm-compaction-respect-ignore_skip_hint-in-update_pageblock_skip.patch
queue-3.12/mm-clear-pmd_numa-before-invalidating.patch
queue-3.12/mm-fix-tlb-flush-race-between-migration-and-change_protection_range.patch
queue-3.12/mm-numa-ensure-anon_vma-is-locked-to-prevent-parallel-thp-splits.patch
queue-3.12/mm-hugetlb-check-for-pte-null-pointer-in-__page_check_address.patch
queue-3.12/mm-munlock-fix-deadlock-in-__munlock_pagevec.patch
queue-3.12/mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates.patch
queue-3.12/mm-numa-avoid-unnecessary-work-on-the-failure-path.patch
queue-3.12/mm-page_alloc-revert-numa-aspect-of-fair-allocation-policy.patch
queue-3.12/mm-mempolicy-correct-putback-method-for-isolate-pages-if-failed.patch
queue-3.12/mm-munlock-fix-a-bug-where-thp-tail-page-is-encountered.patch
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