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ARM: memblock: convert free_highpages() to use memblock

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Free the high pages using the memblock memory lists - and more
importantly, exclude any memblock allocations in highmem from the
free'd memory.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-10-27 19:45:49 +01:00
parent d0e775afb9
commit df4f14c7b2
1 changed files with 39 additions and 5 deletions
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44
arch/arm/mm/init.c
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@ -439,13 +439,47 @@ static void __init free_unused_memmap(struct meminfo *mi)
static void __init free_highpages(void)
{
#ifdef CONFIG_HIGHMEM
int i;
unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
struct memblock_region *mem, *res;
/* set highmem page free */
for_each_bank (i, &meminfo) {
unsigned long start = bank_pfn_start(&meminfo.bank[i]);
unsigned long end = bank_pfn_end(&meminfo.bank[i]);
if (start >= max_low_pfn + PHYS_PFN_OFFSET)
for_each_memblock(memory, mem) {
unsigned long start = memblock_region_memory_base_pfn(mem);
unsigned long end = memblock_region_memory_end_pfn(mem);
/* Ignore complete lowmem entries */
if (end <= max_low)
continue;
/* Truncate partial highmem entries */
if (start < max_low)
start = max_low;
/* Find and exclude any reserved regions */
for_each_memblock(reserved, res) {
unsigned long res_start, res_end;
res_start = memblock_region_reserved_base_pfn(res);
res_end = memblock_region_reserved_end_pfn(res);
if (res_end < start)
continue;
if (res_start < start)
res_start = start;
if (res_start > end)
res_start = end;
if (res_end > end)
res_end = end;
if (res_start != start)
totalhigh_pages += free_area(start, res_start,
NULL);
start = res_end;
if (start == end)
break;
}
/* And now free anything which remains */
if (start < end)
totalhigh_pages += free_area(start, end, NULL);
}
totalram_pages += totalhigh_pages;