Commit b8a0255d authored by Vasily Kulikov's avatar Vasily Kulikov Committed by Linus Torvalds

include/linux/poison.h: use POISON_POINTER_DELTA for poison pointers

TIMER_ENTRY_STATIC and TAIL_MAPPING are defined as poison pointers which
should point to nowhere.  Redefine them using POISON_POINTER_DELTA
arithmetics to make sure they really point to non-mappable area declared
by the target architecture.
Signed-off-by: default avatarVasily Kulikov <>
Acked-by: default avatarThomas Gleixner <>
Cc: Solar Designer <>
Cc: "Kirill A. Shutemov" <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 6611d8d7
......@@ -27,14 +27,14 @@
* Magic number "tsta" to indicate a static timer initializer
* for the object debugging code.
#define TIMER_ENTRY_STATIC ((void *) 0x74737461)
/********** mm/debug-pagealloc.c **********/
#define PAGE_POISON 0xaa
/********** mm/page_alloc.c ************/
#define TAIL_MAPPING ((void *) 0x01014A11 + POISON_POINTER_DELTA)
#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
/********** mm/slab.c **********/
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