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Date: Tue, 26 Jul 2011 17:35:23 +0200
From: Tejun Heo <tj@...nel.org>
To: benh@...nel.crashing.org, yinghai@...nel.org, hpa@...or.com,
tony.luck@...el.com, ralf@...ux-mips.org, schwidefsky@...ibm.com,
liqin.chen@...plusct.com, lethal@...ux-sh.org, davem@...emloft.net,
linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Cc: mingo@...hat.com, Tejun Heo <tj@...nel.org>
Subject: [PATCH 12/23] memblock: Track total size of regions automatically
Total size of memory regions was calculated by memblock_analyze()
requiring explicitly calling the function between operations which can
change memory regions and possible users of total size, which is
cumbersome and fragile.
This patch makes each memblock_type track total size automatically
with minor modifications to memblock manipulation functions and remove
requirements on calling memblock_analyze(). [__]memblock_dump_all()
now also dumps the total size of reserved regions.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Yinghai Lu <yinghai@...nel.org>
---
include/linux/memblock.h | 2 +-
mm/memblock.c | 27 +++++++++++++--------------
2 files changed, 14 insertions(+), 15 deletions(-)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index cd54a1d..3d3c8ce 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -30,12 +30,12 @@ struct memblock_region {
struct memblock_type {
unsigned long cnt; /* number of regions */
unsigned long max; /* size of the allocated array */
+ phys_addr_t total_size; /* size of all regions */
struct memblock_region *regions;
};
struct memblock {
phys_addr_t current_limit;
- phys_addr_t memory_size; /* Updated by memblock_analyze() */
struct memblock_type memory;
struct memblock_type reserved;
};
diff --git a/mm/memblock.c b/mm/memblock.c
index d8582f7..051bc4e 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -179,12 +179,14 @@ int __init_memblock memblock_reserve_reserved_regions(void)
static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
{
+ type->total_size -= type->regions[r].size;
memmove(&type->regions[r], &type->regions[r + 1],
(type->cnt - (r + 1)) * sizeof(type->regions[r]));
type->cnt--;
/* Special case for empty arrays */
if (type->cnt == 0) {
+ WARN_ON(type->total_size != 0);
type->cnt = 1;
type->regions[0].base = 0;
type->regions[0].size = 0;
@@ -314,6 +316,7 @@ static void __init_memblock memblock_insert_region(struct memblock_type *type,
rgn->size = size;
memblock_set_region_node(rgn, nid);
type->cnt++;
+ type->total_size += size;
}
/**
@@ -340,10 +343,11 @@ static int __init_memblock memblock_add_region(struct memblock_type *type,
/* special case for empty array */
if (type->regions[0].size == 0) {
- WARN_ON(type->cnt != 1);
+ WARN_ON(type->cnt != 1 || type->total_size);
type->regions[0].base = base;
type->regions[0].size = size;
memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
+ type->total_size = size;
return 0;
}
repeat:
@@ -453,7 +457,8 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
* to process the next region - the new top half.
*/
rgn->base = base;
- rgn->size = rend - rgn->base;
+ rgn->size -= base - rbase;
+ type->total_size -= base - rbase;
memblock_insert_region(type, i, rbase, base - rbase,
rgn->nid);
} else if (rend > end) {
@@ -462,7 +467,8 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
* current region - the new bottom half.
*/
rgn->base = end;
- rgn->size = rend - rgn->base;
+ rgn->size -= end - rbase;
+ type->total_size -= end - rbase;
memblock_insert_region(type, i--, rbase, end - rbase,
rgn->nid);
} else {
@@ -784,10 +790,9 @@ phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, i
* Remaining API functions
*/
-/* You must call memblock_analyze() before this. */
phys_addr_t __init memblock_phys_mem_size(void)
{
- return memblock.memory_size;
+ return memblock.memory.total_size;
}
phys_addr_t __init_memblock memblock_end_of_DRAM(void)
@@ -797,7 +802,6 @@ phys_addr_t __init_memblock memblock_end_of_DRAM(void)
return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
}
-/* You must call memblock_analyze() after this. */
void __init memblock_enforce_memory_limit(phys_addr_t limit)
{
unsigned long i;
@@ -900,7 +904,9 @@ static void __init_memblock memblock_dump(struct memblock_type *type, char *name
void __init_memblock __memblock_dump_all(void)
{
pr_info("MEMBLOCK configuration:\n");
- pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size);
+ pr_info(" memory size = %#llx reserved size = %#llx\n",
+ (unsigned long long)memblock.memory.total_size,
+ (unsigned long long)memblock.reserved.total_size);
memblock_dump(&memblock.memory, "memory");
memblock_dump(&memblock.reserved, "reserved");
@@ -908,13 +914,6 @@ void __init_memblock __memblock_dump_all(void)
void __init memblock_analyze(void)
{
- int i;
-
- memblock.memory_size = 0;
-
- for (i = 0; i < memblock.memory.cnt; i++)
- memblock.memory_size += memblock.memory.regions[i].size;
-
/* We allow resizing from there */
memblock_can_resize = 1;
}
--
1.7.6
--
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