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memblock: Make MEMBLOCK_ERROR be 0

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And ensure we don't hand out 0 as a valid allocation. We put the
low limit at PAGE_SIZE arbitrarily.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2010-07-28 15:25:10 +10:00
commit 25818f0f28
2 changed files with 7 additions and 1 deletions
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2
include/linux/memblock.h
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@ -19,7 +19,7 @@
#include <asm/memblock.h> #include <asm/memblock.h>
#define INIT_MEMBLOCK_REGIONS 128 #define INIT_MEMBLOCK_REGIONS 128
#define MEMBLOCK_ERROR (~(phys_addr_t)0) #define MEMBLOCK_ERROR 0
struct memblock_region { struct memblock_region {
phys_addr_t base; phys_addr_t base;

6
mm/memblock.c
View file

@ -105,6 +105,12 @@ static phys_addr_t __init memblock_find_region(phys_addr_t start, phys_addr_t en
phys_addr_t base, res_base; phys_addr_t base, res_base;
long j; long j;
/* Prevent allocations returning 0 as it's also used to
* indicate an allocation failure
*/
if (start == 0)
start = PAGE_SIZE;
base = memblock_align_down((end - size), align); base = memblock_align_down((end - size), align);
while (start <= base) { while (start <= base) {
j = memblock_overlaps_region(&memblock.reserved, base, size); j = memblock_overlaps_region(&memblock.reserved, base, size);