[PATCHv2, RFC 29/30] thp: call __vma_adjust_trans_huge() for file-backed VMA

[Kirill A. Shutemov]

From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>

Since we're going to have huge pages in page cache, we need to call
__vma_adjust_trans_huge() for file-backed VMA, which potentially can
contain huge pages.

For now we call it for all VMAs with vm_ops->huge_fault defined.

Probably later we will need to introduce a flag to indicate that the VMA
has huge pages.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
 include/linux/huge_mm.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index aa52c48..c6e3aef 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -161,9 +161,9 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 					 unsigned long end,
 					 long adjust_next)
 {
-	if (!vma->anon_vma || vma->vm_ops)
-		return;
-	__vma_adjust_trans_huge(vma, start, end, adjust_next);
+	if ((vma->anon_vma && !vma->vm_ops) ||
+			(vma->vm_ops && vma->vm_ops->huge_fault))
+		__vma_adjust_trans_huge(vma, start, end, adjust_next);
 }
 static inline int hpage_nr_pages(struct page *page)
 {
-- 
1.7.10.4

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