mm/gup.c: use is_vm_hugetlb_page() to check whether to follow huge

No functional change, just leverage the helper function to improve
readability as others.

Link: http://lkml.kernel.org/r/20200113070322.26627-1-richardw.yang@linux.intel.com
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/gup.c b/mm/gup.c
index 9c41670..6cb7180 100644 (file)
--- 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;