linux-kernel - Re: [PATCH 1/7] mm/khugepaged: remove unneeded shmem_huge

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Date:   Wed, 15 Jun 2022 10:35:49 -0700
From:   Yang Shi <shy828301@...il.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Howells <dhowells@...hat.com>, NeilBrown <neilb@...e.de>,
        Alistair Popple <apopple@...dia.com>,
        David Hildenbrand <david@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Peter Xu <peterx@...hat.com>, Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] mm/khugepaged: remove unneeded shmem_huge_enabled() check

On Sat, Jun 11, 2022 at 1:47 AM Miaohe Lin <linmiaohe@...wei.com> wrote:
>
> If we reach here, hugepage_vma_check() has already made sure that hugepage
> is enabled for shmem. Remove this duplicated check.
>
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Reviewed-by: Yang Shi <shy828301@...il.com>

> ---
>  mm/khugepaged.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index 476d79360101..73570dfffcec 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -2153,8 +2153,6 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
>                 if (khugepaged_scan.address < hstart)
>                         khugepaged_scan.address = hstart;
>                 VM_BUG_ON(khugepaged_scan.address & ~HPAGE_PMD_MASK);
> -               if (shmem_file(vma->vm_file) && !shmem_huge_enabled(vma))
> -                       goto skip;
>
>                 while (khugepaged_scan.address < hend) {
>                         int ret;
> --
> 2.23.0
>
>