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-rw-r--r--mm/hugetlb.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index de5d1dcf34fe..993f7c1820a8 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2355,13 +2355,15 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
struct page *page;
struct hstate *h = hstate_vma(vma);
unsigned long sz = huge_page_size(h);
+ const unsigned long mmun_start = start; /* For mmu_notifiers */
+ const unsigned long mmun_end = end; /* For mmu_notifiers */
WARN_ON(!is_vm_hugetlb_page(vma));
BUG_ON(start & ~huge_page_mask(h));
BUG_ON(end & ~huge_page_mask(h));
tlb_start_vma(tlb, vma);
- mmu_notifier_invalidate_range_start(mm, start, end);
+ mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
again:
spin_lock(&mm->page_table_lock);
for (address = start; address < end; address += sz) {
@@ -2425,7 +2427,7 @@ again:
if (address < end && !ref_page)
goto again;
}
- mmu_notifier_invalidate_range_end(mm, start, end);
+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
tlb_end_vma(tlb, vma);
}
@@ -2525,6 +2527,8 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
struct page *old_page, *new_page;
int avoidcopy;
int outside_reserve = 0;
+ unsigned long mmun_start; /* For mmu_notifiers */
+ unsigned long mmun_end; /* For mmu_notifiers */
old_page = pte_page(pte);
@@ -2611,6 +2615,9 @@ retry_avoidcopy:
pages_per_huge_page(h));
__SetPageUptodate(new_page);
+ mmun_start = address & huge_page_mask(h);
+ mmun_end = mmun_start + huge_page_size(h);
+ mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end);
/*
* Retake the page_table_lock to check for racing updates
* before the page tables are altered
@@ -2619,9 +2626,6 @@ retry_avoidcopy:
ptep = huge_pte_offset(mm, address & huge_page_mask(h));
if (likely(pte_same(huge_ptep_get(ptep), pte))) {
/* Break COW */
- mmu_notifier_invalidate_range_start(mm,
- address & huge_page_mask(h),
- (address & huge_page_mask(h)) + huge_page_size(h));
huge_ptep_clear_flush(vma, address, ptep);
set_huge_pte_at(mm, address, ptep,
make_huge_pte(vma, new_page, 1));
@@ -2629,10 +2633,11 @@ retry_avoidcopy:
hugepage_add_new_anon_rmap(new_page, vma, address);
/* Make the old page be freed below */
new_page = old_page;
- mmu_notifier_invalidate_range_end(mm,
- address & huge_page_mask(h),
- (address & huge_page_mask(h)) + huge_page_size(h));
}
+ spin_unlock(&mm->page_table_lock);
+ mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end);
+ /* Caller expects lock to be held */
+ spin_lock(&mm->page_table_lock);
page_cache_release(new_page);
page_cache_release(old_page);
return 0;