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

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Message-ID: <396ba7b6-15e7-998d-6c64-59519882e211@suse.cz>
Date:   Mon, 13 Jan 2020 14:22:04 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Wei Yang <richardw.yang@...ux.intel.com>, akpm@...ux-foundation.org
Cc:     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 1/13/20 8:03 AM, 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>

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

> ---
>  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;
>