Memblock regions are used to find all available high memory
and to set it free into buddy allocator.
Signed-off-by: Serge Semin <fancer.lancer@xxxxxxxxx>
---
arch/mips/mm/init.c | 54 ++++++++++++++---------------------
1 file changed, 21 insertions(+), 33 deletions(-)
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 6f186c7..98680fb 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -404,32 +404,6 @@ void maar_init(void)
}
#ifndef CONFIG_NEED_MULTIPLE_NODES
-int page_is_ram(unsigned long pagenr)
-{
- int i;
-
- for (i = 0; i < boot_mem_map.nr_map; i++) {
- unsigned long addr, end;
-
- switch (boot_mem_map.map[i].type) {
- case BOOT_MEM_RAM:
- case BOOT_MEM_INIT_RAM:
- break;
- default:
- /* not usable memory */
- continue;
- }
-
- addr = PFN_UP(boot_mem_map.map[i].addr);
- end = PFN_DOWN(boot_mem_map.map[i].addr +
- boot_mem_map.map[i].size);
-
- if (pagenr >= addr && pagenr < end)
- return 1;
- }
-
- return 0;
-}
void __init paging_init(void)
{
@@ -458,18 +432,32 @@ static struct kcore_list kcore_kseg0;
static inline void mem_init_free_highmem(void)
{
#ifdef CONFIG_HIGHMEM
- unsigned long tmp;
+ struct memblock_region *reg;
+ unsigned long pfn;
if (cpu_has_dc_aliases)
return;
- for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
- struct page *page = pfn_to_page(tmp);
+ /* Walk through all memory regions freeing highmem pages only */
+ for_each_memblock(memory, reg) {
+ unsigned long start = memblock_region_memory_base_pfn(reg);
+ unsigned long end = memblock_region_memory_end_pfn(reg);
+
+ /* Ignore complete lowmem entries */
+ if (end <= max_low_pfn)
+ continue;
- if (!page_is_ram(tmp))
- SetPageReserved(page);
- else
- free_highmem_page(page);
+ /* Truncate partial highmem entries */
+ if (start < max_low_pfn)
+ start = max_low_pfn;
+
+ /*
+ * MIPS memblock allocator doesn't allocate regions from high
+ * memory (see mips_lowmem_limit variable initialization), so
+ * just set corresponding pages free
+ */
+ for (pfn = start; pfn < end; pfn++)
+ free_highmem_page(pfn_to_page(pfn));
}
#endif
}
--
2.6.6
