linux-kernel - Re: [v3 PATCH 1/8] sched: coredump.h: clarify the use of MMF_VM

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Message-ID: <b4935d67-36b1-3346-f04c-8d247b462583@suse.cz>
Date:   Mon, 9 May 2022 14:25:07 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Yang Shi <shy828301@...il.com>, kirill.shutemov@...ux.intel.com,
        linmiaohe@...wei.com, songliubraving@...com, riel@...riel.com,
        willy@...radead.org, ziy@...dia.com, tytso@....edu,
        akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v3 PATCH 1/8] sched: coredump.h: clarify the use of
 MMF_VM_HUGEPAGE

On 4/4/22 22:02, Yang Shi wrote:
> MMF_VM_HUGEPAGE is set as long as the mm is available for khugepaged by
> khugepaged_enter(), not only when VM_HUGEPAGE is set on vma.  Correct
> the comment to avoid confusion.
> 
> Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>
> Acked-by: Song Liu <song@...nel.org>
> Signed-off-by: Yang Shi <shy828301@...il.com>

Acked-by: Vlastmil Babka <vbabka@...e.cz>

> ---
>  include/linux/sched/coredump.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h
> index 4d9e3a656875..4d0a5be28b70 100644
> --- a/include/linux/sched/coredump.h
> +++ b/include/linux/sched/coredump.h
> @@ -57,7 +57,8 @@ static inline int get_dumpable(struct mm_struct *mm)
>  #endif
>  					/* leave room for more dump flags */
>  #define MMF_VM_MERGEABLE	16	/* KSM may merge identical pages */
> -#define MMF_VM_HUGEPAGE		17	/* set when VM_HUGEPAGE is set on vma */
> +#define MMF_VM_HUGEPAGE		17	/* set when mm is available for
> +					   khugepaged */
>  /*
>   * This one-shot flag is dropped due to necessity of changing exe once again
>   * on NFS restore