[PATCH] [12/16] POISON: Handle poisoned pages in set_page_dirty()

[Andi Kleen <andi@firstfloor.org>]

Bail out early in set_page_dirty for poisoned pages. We don't want any
of the dirty accounting done or file system write back started, because
the page will be just thrown away.

Signed-off-by: Andi Kleen <ak@linux.intel.com>

---
 mm/page-writeback.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux/mm/page-writeback.c
===================================================================
--- linux.orig/mm/page-writeback.c	2009-04-07 16:39:22.000000000 +0200
+++ linux/mm/page-writeback.c	2009-04-07 16:39:39.000000000 +0200
@@ -1277,6 +1277,10 @@
 {
 	struct address_space *mapping = page_mapping(page);
 
+	if (unlikely(PagePoison(page))) {
+		SetPageDirty(page);
+		return 0;
+	}
 	if (likely(mapping)) {
 		int (*spd)(struct page *) = mapping->a_ops->set_page_dirty;
 #ifdef CONFIG_BLOCK

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