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authorAndi Kleen <andi@firstfloor.org>2008-03-12 03:53:28 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:41:30 +0200
commitcc6150321903ca4c3bc9d53b0cdafb05d77d64d0 (patch)
treecfdb0ee512da7da82c15d4b1aae66d1f25640f31 /arch/x86/mm
parent67794292c8615b05f46419ba8d4fd99e7c9a5db9 (diff)
x86: account overlapped mappings in max_pfn_mapped
When end_pfn is not aligned to 2MB (or 1GB) then the kernel might map more memory than end_pfn. Account this in max_pfn_mapped. Signed-off-by: Andi Kleen <ak@suse.de> Cc: andreas.herrmann3@amd.com Cc: mingo@elte.hu Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/init_64.c34
1 files changed, 23 insertions, 11 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index ef9e9cfb1fc..1076097dcab 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -313,7 +313,7 @@ __meminit void early_iounmap(void *addr, unsigned long size)
__flush_tlb_all();
}
-static void __meminit
+static unsigned long __meminit
phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
{
int i = pmd_index(address);
@@ -335,21 +335,26 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
set_pte((pte_t *)pmd,
pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
}
+ return address;
}
-static void __meminit
+static unsigned long __meminit
phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
{
pmd_t *pmd = pmd_offset(pud, 0);
+ unsigned long last_map_addr;
+
spin_lock(&init_mm.page_table_lock);
- phys_pmd_init(pmd, address, end);
+ last_map_addr = phys_pmd_init(pmd, address, end);
spin_unlock(&init_mm.page_table_lock);
__flush_tlb_all();
+ return last_map_addr;
}
-static void __meminit
+static unsigned long __meminit
phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
{
+ unsigned long last_map_addr = end;
int i = pud_index(addr);
for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
@@ -368,13 +373,14 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
if (pud_val(*pud)) {
if (!pud_large(*pud))
- phys_pmd_update(pud, addr, end);
+ last_map_addr = phys_pmd_update(pud, addr, end);
continue;
}
if (direct_gbpages) {
set_pte((pte_t *)pud,
pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
+ last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
continue;
}
@@ -382,12 +388,14 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
spin_lock(&init_mm.page_table_lock);
set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE));
- phys_pmd_init(pmd, addr, end);
+ last_map_addr = phys_pmd_init(pmd, addr, end);
spin_unlock(&init_mm.page_table_lock);
unmap_low_page(pmd);
}
__flush_tlb_all();
+
+ return last_map_addr >> PAGE_SHIFT;
}
static void __init find_early_table_space(unsigned long end)
@@ -542,9 +550,9 @@ static void __init early_memtest(unsigned long start, unsigned long end)
* This runs before bootmem is initialized and gets pages directly from
* the physical memory. To access them they are temporarily mapped.
*/
-void __init_refok init_memory_mapping(unsigned long start, unsigned long end)
+unsigned long __init_refok init_memory_mapping(unsigned long start, unsigned long end)
{
- unsigned long next;
+ unsigned long next, last_map_addr = end;
unsigned long start_phys = start, end_phys = end;
printk(KERN_INFO "init_memory_mapping\n");
@@ -577,7 +585,7 @@ void __init_refok init_memory_mapping(unsigned long start, unsigned long end)
next = start + PGDIR_SIZE;
if (next > end)
next = end;
- phys_pud_init(pud, __pa(start), __pa(next));
+ last_map_addr = phys_pud_init(pud, __pa(start), __pa(next));
if (!after_bootmem)
set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys));
unmap_low_page(pud);
@@ -593,6 +601,8 @@ void __init_refok init_memory_mapping(unsigned long start, unsigned long end)
if (!after_bootmem)
early_memtest(start_phys, end_phys);
+
+ return last_map_addr;
}
#ifndef CONFIG_NUMA
@@ -632,11 +642,13 @@ int arch_add_memory(int nid, u64 start, u64 size)
{
struct pglist_data *pgdat = NODE_DATA(nid);
struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
- unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
- init_memory_mapping(start, start + size-1);
+ last_mapped_pfn = init_memory_mapping(start, start + size-1);
+ if (last_mapped_pfn > max_pfn_mapped)
+ max_pfn_mapped = last_mapped_pfn;
ret = __add_pages(zone, start_pfn, nr_pages);
WARN_ON(1);