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mm/memblock.c: avoid abuse of RED_INACTIVE 

RED_INACTIVE is a slab thing, and reusing it for memblock was
inappropriate, because memblock is dealing with phys_addr_t's which have a
Kconfigurable sizeof().

Create a new poison type for this application.  Fixes the sparse warning

    warning: cast truncates bits from constant value (9f911029d74e35b becomes 9d74e35b)

Reported-by: H Hartley Sweeten <hartleys@visionengravers.com>
Tested-by: H Hartley Sweeten <hartleys@visionengravers.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2011-07-25 17:12:18 -07:00 committed by Linus Torvalds
parent be8f684d73
commit c9d8c3d089
2 changed files with 10 additions and 4 deletions
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6
include/linux/poison.h
View File

@ -40,6 +40,12 @@
#define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
#define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
#ifdef CONFIG_PHYS_ADDR_T_64BIT
#define MEMBLOCK_INACTIVE 0x3a84fb0144c9e71bULL
#else
#define MEMBLOCK_INACTIVE 0x44c9e71bUL
#endif
#define SLUB_RED_INACTIVE 0xbb
#define SLUB_RED_ACTIVE 0xcc

8
mm/memblock.c
View File

@ -758,9 +758,9 @@ void __init memblock_analyze(void)
/* Check marker in the unused last array entry */
WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
!= (phys_addr_t)RED_INACTIVE);
!= MEMBLOCK_INACTIVE);
WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
!= (phys_addr_t)RED_INACTIVE);
!= MEMBLOCK_INACTIVE);
memblock.memory_size = 0;
@ -786,8 +786,8 @@ void __init memblock_init(void)
memblock.reserved.max = INIT_MEMBLOCK_REGIONS;
/* Write a marker in the unused last array entry */
memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;
memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE;
memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = MEMBLOCK_INACTIVE;
memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = MEMBLOCK_INACTIVE;
/* Create a dummy zero size MEMBLOCK which will get coalesced away later.
* This simplifies the memblock_add() code below...