Merge branch 'bkl/procfs' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic...

[linux-2.6-block.git] / include / linux / poison.h

diff --git a/include/linux/poison.h b/include/linux/poison.h
index 2110a81c5e2afaab47ec5cb107cf17503d731317..34066ffd893d733b8134da1b57915bec314afb48 100644 (file)
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -48,6 +48,15 @@
 #define POISON_FREE    0x6b    /* for use-after-free poisoning */
 #define        POISON_END      0xa5    /* end-byte of poisoning */
 
+/********** mm/hugetlb.c **********/
+/*
+ * Private mappings of hugetlb pages use this poisoned value for
+ * page->mapping. The core VM should not be doing anything with this mapping
+ * but futex requires the existence of some page->mapping value even though it
+ * is unused if PAGE_MAPPING_ANON is set.
+ */
+#define HUGETLB_POISON ((void *)(0x00300300 + POISON_POINTER_DELTA + PAGE_MAPPING_ANON))
+
 /********** arch/$ARCH/mm/init.c **********/
 #define POISON_FREE_INITMEM    0xcc