linux-kernel - [PATCH 1/3] mm: honor FOLL_GET flag in follow_hugetlb

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Date:	Tue,  7 May 2013 16:45:54 -0400
From:	j.glisse@...il.com
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, Jerome Glisse <jglisse@...hat.com>
Subject: [PATCH 1/3] mm: honor FOLL_GET flag in follow_hugetlb_page

From: Jerome Glisse <jglisse@...hat.com>

Do not increase page count if FOLL_GET is not set.

Signed-off-by: Jerome Glisse <jglisse@...hat.com>
---
 mm/hugetlb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 1a12f5b..5d1e46b 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2991,7 +2991,9 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
 same_page:
 		if (pages) {
 			pages[i] = mem_map_offset(page, pfn_offset);
-			get_page(pages[i]);
+			if (flags & FOLL_GET) {
+				get_page_foll(pages[i]);
+			}
 		}
 
 		if (vmas)
-- 
1.8.2.1

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