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mm/ARM64: prepare for removing num_physpages and simplify mem_init() 

Prepare for removing num_physpages and simplify mem_init().

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiang Liu 2013-07-03 15:03:49 -07:00 committed by Linus Torvalds
parent 2450c97323
commit bee4ebd117
1 changed files with 3 additions and 45 deletions
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48
arch/arm64/mm/init.c
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@ -272,59 +272,17 @@ static void __init free_unused_memmap(void)
*/
void __init mem_init(void)
{
unsigned long reserved_pages, free_pages;
struct memblock_region *reg;
arm64_swiotlb_init();
max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
#ifndef CONFIG_SPARSEMEM_VMEMMAP
/* this will put all unused low memory onto the freelists */
free_unused_memmap();
#endif
/* this will put all unused low memory onto the freelists */
free_all_bootmem();
reserved_pages = free_pages = 0;
for_each_memblock(memory, reg) {
unsigned int pfn1, pfn2;
struct page *page, *end;
pfn1 = __phys_to_pfn(reg->base);
pfn2 = pfn1 + __phys_to_pfn(reg->size);
page = pfn_to_page(pfn1);
end = pfn_to_page(pfn2 - 1) + 1;
do {
if (PageReserved(page))
reserved_pages++;
else if (!page_count(page))
free_pages++;
page++;
} while (page < end);
}
/*
* Since our memory may not be contiguous, calculate the real number
* of pages we have in this system.
*/
pr_info("Memory:");
num_physpages = 0;
for_each_memblock(memory, reg) {
unsigned long pages = memblock_region_memory_end_pfn(reg) -
memblock_region_memory_base_pfn(reg);
num_physpages += pages;
printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
}
printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
pr_notice("Memory: %luk/%luk available, %luk reserved\n",
nr_free_pages() << (PAGE_SHIFT-10),
free_pages << (PAGE_SHIFT-10),
reserved_pages << (PAGE_SHIFT-10));
mem_init_print_info();
#define MLK(b, t) b, t, ((t) - (b)) >> 10
#define MLM(b, t) b, t, ((t) - (b)) >> 20
@ -366,7 +324,7 @@ void __init mem_init(void)
BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
extern int sysctl_overcommit_memory;
/*
* On a machine this small we won't get anywhere without