linux-kernel - [RFC][PATCH 6/18] fix pgoff in "have to relocate" case of mremap()

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Message-Id: <E1NH04g-0000RD-W6@ZenIV.linux.org.uk>
Date:	Sat, 05 Dec 2009 19:13:46 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	linux-arch@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [RFC][PATCH 6/18] fix pgoff in "have to relocate" case of
 mremap()


Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 mm/mremap.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/mm/mremap.c b/mm/mremap.c
index 84efffb..bbbbbf5 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -495,7 +495,9 @@ unsigned long do_mremap(unsigned long addr,
 			map_flags |= MAP_SHARED;
 
 		new_addr = get_unmapped_area(vma->vm_file, 0, new_len,
-					vma->vm_pgoff, map_flags);
+					vma->vm_pgoff +
+					((addr - vma->vm_start) >> PAGE_SHIFT),
+					map_flags);
 		if (new_addr & ~PAGE_MASK) {
 			ret = new_addr;
 			goto out;
-- 
1.5.6.5


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