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

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Date:   Thu, 27 Feb 2020 05:36:42 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Vlastimil Babka <vbabka@...e.cz>, 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 02/26/2020 05:04 PM, Vlastimil Babka wrote:
> 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 While at this, fix an old comment which is no longer valid.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?

Sure, will do.