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mm: numa: guarantee that tlb_flush_pending updates are visible before page table updates
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@suse.de> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -480,7 +480,12 @@ static inline bool mm_tlb_flush_pending(struct mm_struct *mm)
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static inline void set_tlb_flush_pending(struct mm_struct *mm)
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{
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mm->tlb_flush_pending = true;
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barrier();
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/*
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* Guarantee that the tlb_flush_pending store does not leak into the
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* critical section updating the page tables
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*/
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smp_mb__before_spinlock();
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}
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/* Clearing is done after a TLB flush, which also provides a barrier. */
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static inline void clear_tlb_flush_pending(struct mm_struct *mm)
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