It's unnecessary to walk the page table when vma_address() return -EFAULT. Return early if so to save some cpu cycles. Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx> --- mm/memory-failure.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index b3ff7e99a421..f86819145ea8 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -315,6 +315,8 @@ static unsigned long dev_pagemap_mapping_shift(struct page *page, pmd_t *pmd; pte_t *pte; + if (address == -EFAULT) + return 0; pgd = pgd_offset(vma->vm_mm, address); if (!pgd_present(*pgd)) return 0; -- 2.23.0
