Subject: + mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates.patch added to -mm tree
To: mgorman@xxxxxxx,paulmck@xxxxxxxxxxxxxxxxxx,riel@xxxxxxxxxx,stable@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Wed, 11 Dec 2013 14:24:12 -0800
The patch titled
Subject: mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates
has been added to the -mm tree. Its filename is
mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates.patch
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From: Mel Gorman <mgorman@xxxxxxx>
Subject: mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates
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>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm_types.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN include/linux/mm_types.h~mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates include/linux/mm_types.h
--- a/include/linux/mm_types.h~mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates
+++ a/include/linux/mm_types.h
@@ -482,7 +482,12 @@ 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 -mm which might be from mgorman@xxxxxxx are
mm-numa-serialise-parallel-get_user_page-against-thp-migration.patch
mm-numa-call-mmu-notifiers-on-thp-migration.patch
mm-clear-pmd_numa-before-invalidating.patch
mm-numa-do-not-clear-pmd-during-pte-update-scan.patch
mm-numa-do-not-clear-pte-for-pte_numa-update.patch
mm-numa-ensure-anon_vma-is-locked-to-prevent-parallel-thp-splits.patch
mm-numa-avoid-unnecessary-work-on-the-failure-path.patch
sched-numa-skip-inaccessible-vmas.patch
mm-numa-clear-numa-hinting-information-on-mprotect.patch
mm-numa-avoid-unnecessary-disruption-of-numa-hinting-during-migration.patch
mm-fix-tlb-flush-race-between-migration-and-change_protection_range.patch
mm-fix-tlb-flush-race-between-migration-and-change_protection_range-fix.patch
mm-numa-guarantee-that-tlb_flush_pending-updates-are-visible-before-page-table-updates.patch
mm-numa-defer-tlb-flush-for-thp-migration-as-long-as-possible.patch
mm-page_alloc-exclude-unreclaimable-allocations-from-zone-fairness-policy.patch
mm-hugetlbfs-add-some-vm_bug_ons-to-catch-non-hugetlbfs-pages.patch
mm-hugetlb-use-get_page_foll-in-follow_hugetlb_page.patch
mm-hugetlbfs-move-the-put-get_page-slab-and-hugetlbfs-optimization-in-a-faster-path.patch
mm-thp-optimize-compound_trans_huge.patch
mm-tail-page-refcounting-optimization-for-slab-and-hugetlbfs.patch
mm-hugetlbfs-use-__compound_tail_refcounted-in-__get_page_tail-too.patch
mm-hugetlbc-simplify-pageheadhuge-and-pagehuge.patch
mm-swapc-reorganize-put_compound_page.patch
mm-hugetlbc-defer-pageheadhuge-symbol-export.patch
mm-get-rid-of-unnecessary-pageblock-scanning-in-setup_zone_migrate_reserve.patch
mm-get-rid-of-unnecessary-pageblock-scanning-in-setup_zone_migrate_reserve-fix.patch
mm-call-mmu-notifiers-when-copying-a-hugetlb-page-range.patch
mm-show_mem-remove-show_mem_filter_page_count.patch
x86-get-pg_data_ts-memory-from-other-node.patch
memblock-numa-introduce-flags-field-into-memblock.patch
memblock-mem_hotplug-introduce-memblock_hotplug-flag-to-mark-hotpluggable-regions.patch
memblock-make-memblock_set_node-support-different-memblock_type.patch
acpi-numa-mem_hotplug-mark-hotpluggable-memory-in-memblock.patch
acpi-numa-mem_hotplug-mark-all-nodes-the-kernel-resides-un-hotpluggable.patch
memblock-mem_hotplug-make-memblock-skip-hotpluggable-regions-if-needed.patch
x86-numa-acpi-memory-hotplug-make-movable_node-have-higher-priority.patch
mm-rmap-recompute-pgoff-for-huge-page.patch
mm-rmap-factor-nonlinear-handling-out-of-try_to_unmap_file.patch
mm-rmap-factor-lock-function-out-of-rmap_walk_anon.patch
mm-rmap-make-rmap_walk-to-get-the-rmap_walk_control-argument.patch
mm-rmap-extend-rmap_walk_xxx-to-cope-with-different-cases.patch
mm-rmap-use-rmap_walk-in-try_to_unmap.patch
mm-rmap-use-rmap_walk-in-try_to_munlock.patch
mm-rmap-use-rmap_walk-in-page_referenced.patch
mm-rmap-use-rmap_walk-in-page_mkclean.patch
mm-page_alloc-allow-__gfp_nofail-to-allocate-below-watermarks-after-reclaim.patch
mm-numa-make-numa-migrate-related-functions-static.patch
mm-numa-limit-scope-of-lock-for-numa-migrate-rate-limiting.patch
mm-numa-trace-tasks-that-fail-migration-due-to-rate-limiting.patch
mm-numa-do-not-automatically-migrate-ksm-pages.patch
sched-add-tracepoints-related-to-numa-task-migration.patch
sched-add-tracepoints-related-to-numa-task-migration-fix.patch
linux-next.patch
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