diff options
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c index 5c757fba8858..a7025ed5c65b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -374,6 +374,8 @@ void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, * be 0. This will underflow and is okay. */ next = mas_find(mas, ceiling - 1); + if (unlikely(xa_is_zero(next))) + next = NULL; /* * Hide vma from rmap and truncate_pagecache before freeing @@ -395,6 +397,8 @@ void free_pgtables(struct mmu_gather *tlb, struct ma_state *mas, && !is_vm_hugetlb_page(next)) { vma = next; next = mas_find(mas, ceiling - 1); + if (unlikely(xa_is_zero(next))) + next = NULL; if (mm_wr_locked) vma_start_write(vma); unlink_anon_vmas(vma); @@ -1744,7 +1748,8 @@ void unmap_vmas(struct mmu_gather *tlb, struct ma_state *mas, unmap_single_vma(tlb, vma, start, end, &details, mm_wr_locked); hugetlb_zap_end(vma, &details); - } while ((vma = mas_find(mas, tree_end - 1)) != NULL); + vma = mas_find(mas, tree_end - 1); + } while (vma && likely(!xa_is_zero(vma))); mmu_notifier_invalidate_range_end(&range); } |