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mm: mmu_notifier fix for tlb_end_vma

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The generic tlb_end_vma does not call invalidate_range mmu notifier, and
it resets resets the mmu_gather range, which means the notifier won't be
called on part of the range in case of an unmap that spans multiple
vmas.

ARM64 seems to be the only arch I could see that has notifiers and uses
the generic tlb_end_vma.  I have not actually tested it.

[ Catalin and Will point out that ARM64 currently only uses the
  notifiers for KVM, which doesn't use the ->invalidate_range()
  callback right now, so it's a bug, but one that happens to
  not affect them.  So not necessary for stable.  - Linus ]

Signed-off-by: Nicholas Piggin <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nicholas Piggin 2018-08-23 18:47:09 +10:00 • committed by Linus Torvalds
commit fd1102f0aa
2 changed files with 13 additions and 14 deletions
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10
mm/memory.c
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@ -238,16 +238,6 @@ void arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
__tlb_reset_range(tlb);
}
static void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
{
if (!tlb->end)
return;
tlb_flush(tlb);
mmu_notifier_invalidate_range(tlb->mm, tlb->start, tlb->end);
__tlb_reset_range(tlb);
}
static void tlb_flush_mmu_free(struct mmu_gather *tlb)
{
struct mmu_gather_batch *batch;