From: Nick Piggin <nickpiggin@yahoo.com.au>
Date: Sat, 3 Sep 2005 22:54:48 +0000 (-0700)
Subject: [PATCH] mm: cleanup rmap
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=4d7670e0f649f9e6e6ea6c8bb9f52441fa00f92b;p=openwrt%2Fstaging%2Fblogic.git

[PATCH] mm: cleanup rmap

Thanks to Bill Irwin for pointing this out.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/rmap.c b/mm/rmap.c
index 7e975ca24c78..450f5241b5a5 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -445,16 +445,12 @@ void page_add_anon_rmap(struct page *page,
 
 	if (atomic_inc_and_test(&page->_mapcount)) {
 		struct anon_vma *anon_vma = vma->anon_vma;
-		pgoff_t index;
 
 		BUG_ON(!anon_vma);
 		anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;
 		page->mapping = (struct address_space *) anon_vma;
 
-		index = (address - vma->vm_start) >> PAGE_SHIFT;
-		index += vma->vm_pgoff;
-		index >>= PAGE_CACHE_SHIFT - PAGE_SHIFT;
-		page->index = index;
+		page->index = linear_page_index(vma, address);
 
 		inc_page_state(nr_mapped);
 	}