[PATCH -next] fs: fix fs/fs-writeback.c build error

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxx>

In linux-next, fs/fs-writeback.c no longer #includes <linux/buffer_head.h>,
which #included <linux/pagemap.h>, so add that latter header file to
<linux/writeback.h> to fix the build error:

fs/fs-writeback.c:510:11: error: 'PAGE_CACHE_SHIFT' undeclared (first use in this function)

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
---
 include/linux/writeback.h |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20120105.orig/include/linux/writeback.h
+++ linux-next-20120105/include/linux/writeback.h
@@ -6,6 +6,7 @@
 
 #include <linux/sched.h>
 #include <linux/fs.h>
+#include <linux/pagemap.h>
 
 DECLARE_PER_CPU(int, dirty_throttle_leaks);
 
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