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memblock: Move memblock arrays to static storage in memblock.c and make their size a variable

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This is in preparation for having resizable arrays.

Note that we still allocate one more than needed, this is unchanged from
the previous implementation.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2010-07-06 15:39:06 -07:00
parent 4734b594c6
commit bf23c51f1f
2 changed files with 13 additions and 4 deletions
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7
include/linux/memblock.h
View file

@ -18,7 +18,7 @@
#include <asm/memblock.h> #include <asm/memblock.h>
#define MAX_MEMBLOCK_REGIONS 128 #define INIT_MEMBLOCK_REGIONS 128
struct memblock_region { struct memblock_region {
phys_addr_t base; phys_addr_t base;
@ -26,8 +26,9 @@ struct memblock_region {
}; };
struct memblock_type { struct memblock_type {
unsigned long cnt; unsigned long cnt; /* number of regions */
struct memblock_region regions[MAX_MEMBLOCK_REGIONS+1]; unsigned long max; /* size of the allocated array */
struct memblock_region *regions;
}; };
struct memblock { struct memblock {

10
mm/memblock.c
View file

@ -18,6 +18,8 @@
struct memblock memblock; struct memblock memblock;
static int memblock_debug; static int memblock_debug;
static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1];
static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1];
static int __init early_memblock(char *p) static int __init early_memblock(char *p)
{ {
@ -104,6 +106,12 @@ static void memblock_coalesce_regions(struct memblock_type *type,
void __init memblock_init(void) void __init memblock_init(void)
{ {
/* Hookup the initial arrays */
memblock.memory.regions = memblock_memory_init_regions;
memblock.memory.max = INIT_MEMBLOCK_REGIONS;
memblock.reserved.regions = memblock_reserved_init_regions;
memblock.reserved.max = INIT_MEMBLOCK_REGIONS;
/* Create a dummy zero size MEMBLOCK which will get coalesced away later. /* Create a dummy zero size MEMBLOCK which will get coalesced away later.
* This simplifies the memblock_add() code below... * This simplifies the memblock_add() code below...
*/ */
@ -169,7 +177,7 @@ static long memblock_add_region(struct memblock_type *type, phys_addr_t base, ph
if (coalesced) if (coalesced)
return coalesced; return coalesced;
if (type->cnt >= MAX_MEMBLOCK_REGIONS) if (type->cnt >= type->max)
return -1; return -1;
/* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */ /* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */