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Date: Fri, 24 Sep 2021 10:24:06 +0800 From: Qi Zheng <zhengqi.arch@...edance.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: naoya.horiguchi@....com, 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 9/24/21 7:17 AM, Andrew Morton wrote: > On Thu, 23 Sep 2021 20:26:42 +0800 Qi Zheng <zhengqi.arch@...edance.com> wrote: > >> The paired pte_unmap() call is missing before the >> dev_pagemap_mapping_shift() returns. So fix it. >> >> ... >> >> --- 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; >> } >> > > This is neater? Yes, and I see this neater version has merged into your mm tree, thanks. :) > > +++ a/mm/memory-failure.c > @@ -330,11 +330,8 @@ static unsigned long dev_pagemap_mapping > if (pmd_devmap(*pmd)) > return PMD_SHIFT; > pte = pte_offset_map(pmd, address); > - if (!pte_present(*pte)) > - goto unmap; > - if (pte_devmap(*pte)) > + if (pte_present(*pte) && pte_devmap(*pte)) > ret = PAGE_SHIFT; > -unmap: > pte_unmap(pte); > return ret; > } > _ >
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