linux-ext4 - Re: [PATCH 1/8] sched: coredump.h: clarify the use of MMF_VM

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Date:   Tue, 1 Mar 2022 16:45:20 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Yang Shi <shy828301@...il.com>
CC:     <linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-ext4@...r.kernel.org>, <linux-xfs@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <vbabka@...e.cz>,
        <kirill.shutemov@...ux.intel.com>, <songliubraving@...com>,
        <riel@...riel.com>, <willy@...radead.org>, <ziy@...dia.com>,
        <akpm@...ux-foundation.org>, <tytso@....edu>,
        <adilger.kernel@...ger.ca>, <darrick.wong@...cle.com>
Subject: Re: [PATCH 1/8] sched: coredump.h: clarify the use of MMF_VM_HUGEPAGE

On 2022/3/1 7:57, 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.
> 
> Signed-off-by: Yang Shi <shy828301@...il.com>
> ---
>  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 */

I think this comment could be written in one line. Anyway, this patch looks good to me.
Thanks.

Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>

>  /*
>   * This one-shot flag is dropped due to necessity of changing exe once again
>   * on NFS restore
>