diff options
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 21 |
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; |