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-rw-r--r--include/linux/poison.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/poison.h b/include/linux/poison.h
index 2110a81c5e2a..34066ffd893d 100644
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -48,6 +48,15 @@
48#define POISON_FREE 0x6b /* for use-after-free poisoning */ 48#define POISON_FREE 0x6b /* for use-after-free poisoning */
49#define POISON_END 0xa5 /* end-byte of poisoning */ 49#define POISON_END 0xa5 /* end-byte of poisoning */
50 50
51/********** mm/hugetlb.c **********/
52/*
53 * Private mappings of hugetlb pages use this poisoned value for
54 * page->mapping. The core VM should not be doing anything with this mapping
55 * but futex requires the existence of some page->mapping value even though it
56 * is unused if PAGE_MAPPING_ANON is set.
57 */
58#define HUGETLB_POISON ((void *)(0x00300300 + POISON_POINTER_DELTA + PAGE_MAPPING_ANON))
59
51/********** arch/$ARCH/mm/init.c **********/ 60/********** arch/$ARCH/mm/init.c **********/
52#define POISON_FREE_INITMEM 0xcc 61#define POISON_FREE_INITMEM 0xcc
53 62