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x86: account overlapped mappings in max_pfn_mapped

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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>
This commit is contained in:
Andi Kleen 2008-03-12 03:53:28 +01:00 committed by Ingo Molnar
parent 67794292c8
commit cc61503219
4 changed files with 27 additions and 14 deletions
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2
arch/x86/kernel/setup_64.c
View file

@ -347,7 +347,7 @@ void __init setup_arch(char **cmdline_p)
check_efer();
init_memory_mapping(0, (max_pfn_mapped << PAGE_SHIFT));
max_pfn_mapped = init_memory_mapping(0, (max_pfn_mapped << PAGE_SHIFT));
if (efi_enabled)
efi_init();

34
arch/x86/mm/init_64.c
View file

@ -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);

3
include/asm-x86/page_64.h
View file

@ -80,6 +80,9 @@ typedef struct { pteval_t pte; } pte_t;
#define vmemmap ((struct page *)VMEMMAP_START)
extern unsigned long init_memory_mapping(unsigned long start,
unsigned long end);
#endif /* !__ASSEMBLY__ */
#ifdef CONFIG_FLATMEM

2
include/asm-x86/proto.h
View file

@ -7,8 +7,6 @@
extern void early_idt_handler(void);
extern void init_memory_mapping(unsigned long start, unsigned long end);
extern void system_call(void);
extern void syscall_init(void);