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Date: Thu, 23 Sep 2021 23:30:01 +0800 From: Qi Zheng <zhengqi.arch@...edance.com> To: David Hildenbrand <david@...hat.com>, naoya.horiguchi@....com, akpm@...ux-foundation.org Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, songmuchun@...edance.com Subject: Re: [PATCH] mm/memory_failure: Fix the missing pte_unmap() call On 9/23/21 11:19 PM, David Hildenbrand wrote: > On 23.09.21 14:26, Qi Zheng wrote: >> The paired pte_unmap() call is missing before the >> dev_pagemap_mapping_shift() returns. So fix it. >> >> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com> >> --- >> mm/memory-failure.c | 9 ++++++--- >> 1 file changed, 6 insertions(+), 3 deletions(-) >> >> diff --git a/mm/memory-failure.c b/mm/memory-failure.c >> index e2984c123e7e..4e5419f16fd4 100644 >> --- a/mm/memory-failure.c >> +++ b/mm/memory-failure.c >> @@ -306,6 +306,7 @@ static unsigned long >> dev_pagemap_mapping_shift(struct page *page, >> struct vm_area_struct *vma) >> { >> unsigned long address = vma_address(page, vma); >> + unsigned long ret = 0; >> pgd_t *pgd; >> p4d_t *p4d; >> pud_t *pud; >> @@ -330,10 +331,12 @@ static unsigned long >> dev_pagemap_mapping_shift(struct page *page, >> return PMD_SHIFT; >> pte = pte_offset_map(pmd, address); >> if (!pte_present(*pte)) >> - return 0; >> + goto unmap; >> if (pte_devmap(*pte)) >> - return PAGE_SHIFT; >> - return 0; >> + ret = PAGE_SHIFT; >> +unmap: >> + pte_unmap(pte); >> + return ret; >> } >> /* >> > > I guess this code never runs on 32bit / highmem, that's why we didn't > notice so far. I guess so too. > > Reviewed-by: David Hildenbrand <david@...hat.com> > Thanks, Qi
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