[RFC][PATCH 6/18] fix pgoff in "have to relocate" case ofmremap()

[Al Viro]

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
 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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