linux-kernel - Re: [PATCH] mm/gup.c: use is_vm_hugetlb_page() to check whether to follow huge

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Date:   Wed, 15 Jan 2020 09:52:21 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     Wei Yang <richardw.yang@...ux.intel.com>,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/gup.c: use is_vm_hugetlb_page() to check whether to
 follow huge

On Tue, Jan 14, 2020 at 11:07:03AM -0800, Ralph Campbell wrote:
>
>On 1/12/20 11:03 PM, Wei Yang wrote:
>> No functional change, just leverage the helper function to improve
>> readability as others.
>> 
>> Signed-off-by: Wei Yang <richardw.yang@...ux.intel.com>
>
>I had thought about doing this same thing. :-)

Ah, in Chinese, there is a saying: Heroes see the same :-)

>Reviewed-by: Ralph Campbell <rcampbell@...dia.com>
>
>> ---
>>   mm/gup.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/mm/gup.c b/mm/gup.c
>> index 7646bf993b25..7705929cc920 100644
>> --- a/mm/gup.c
>> +++ b/mm/gup.c
>> @@ -323,7 +323,7 @@ static struct page *follow_pmd_mask(struct vm_area_struct *vma,
>>   	pmdval = READ_ONCE(*pmd);
>>   	if (pmd_none(pmdval))
>>   		return no_page_table(vma, flags);
>> -	if (pmd_huge(pmdval) && vma->vm_flags & VM_HUGETLB) {
>> +	if (pmd_huge(pmdval) && is_vm_hugetlb_page(vma)) {
>>   		page = follow_huge_pmd(mm, address, pmd, flags);
>>   		if (page)
>>   			return page;
>> @@ -433,7 +433,7 @@ static struct page *follow_pud_mask(struct vm_area_struct *vma,
>>   	pud = pud_offset(p4dp, address);
>>   	if (pud_none(*pud))
>>   		return no_page_table(vma, flags);
>> -	if (pud_huge(*pud) && vma->vm_flags & VM_HUGETLB) {
>> +	if (pud_huge(*pud) && is_vm_hugetlb_page(vma)) {
>>   		page = follow_huge_pud(mm, address, pud, flags);
>>   		if (page)
>>   			return page;
>> 

-- 
Wei Yang
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