[PATCH v2] fix __set_page_dirty_no_writeback() return value

[Bob Liu <lliubbo@gmail.com>]

__set_page_dirty_no_writeback() should return true if it actually transitioned
the page from a clean to dirty state although it seems nobody used its return
value now.

Change from v1:
	* preserving cacheline optimisation as Andrew pointed out

Signed-off-by: Bob Liu <lliubbo@gmail.com>
---
 mm/page-writeback.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index bf85062..ac7018a 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1157,8 +1157,10 @@ EXPORT_SYMBOL(write_one_page);
  */
 int __set_page_dirty_no_writeback(struct page *page)
 {
-	if (!PageDirty(page))
+	if (!PageDirty(page)) {
 		SetPageDirty(page);
+		return 1;
+	}
 	return 0;
 }
 
-- 
1.6.3.3

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