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

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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: Vasily Kulikov <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Cc: Solar Designer <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Vasily Kulikov authored and Linus Torvalds committed 2016-01-16 11:17:22 -08:00
1 parent 6611d8d761
commit b8a0255db9
1 file changed
+2 -2
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include/linux/poison.h
+2 -2
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@@ -27,14 +27,14 @@
* Magic number "tsta" to indicate a static timer initializer
* for the object debugging code.
*/
#define TIMER_ENTRY_STATIC ((void *) 0x74737461)
#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
/********** 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 **********/
/*