linux-kernel - Re: [PATCH 1/3] mm/vma: Move VM_NO

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Date:   Wed, 26 Feb 2020 12:34:39 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mm/vma: Move VM_NO_KHUGEPAGED into generic header

On 2/26/20 5:50 AM, Anshuman Khandual wrote:
> Move VM_NO_KHUGEPAGED into generic header (include/linux/mm.h). This just
> makes sure that no VMA flag is scattered in individual function files any
> longer. While at this, fix an old comment which is no longer valid.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
>  include/linux/mm.h | 3 ++-
>  mm/khugepaged.c    | 2 --
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 52269e56c514..6f7e400e6ea3 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -287,6 +287,8 @@ extern unsigned int kobjsize(const void *objp);
>  #define VM_NOHUGEPAGE	0x40000000	/* MADV_NOHUGEPAGE marked this vma */
>  #define VM_MERGEABLE	0x80000000	/* KSM may merge identical pages */
>  
> +#define VM_NO_KHUGEPAGED (VM_SPECIAL | VM_HUGETLB)

While the preprocessor doesn't mind that VM_SPECIAL is only defined later, I
would have moved this below VM_SPECIAL definition anyway, where it fits better,
and add a comment like other defines there do?