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linux-sg2042
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x86, 64bit, mm: hibernate use generic mapping_init 

We should set mappings only for usable memory ranges under max_pfn
Otherwise causes same problem that is fixed by

	x86, mm: Only direct map addresses that are marked as E820_RAM

Make it only map range in pfn_mapped array.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-34-git-send-email-yinghai@kernel.org
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: linux-pm@vger.kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2013-01-24 12:20:14 -08:00 committed by H. Peter Anvin
parent 72212675d1
commit 8b78c21d72
1 changed files with 21 additions and 43 deletions
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64
arch/x86/power/hibernate_64.c
View File

@ -11,6 +11,8 @@
#include <linux/gfp.h>
#include <linux/smp.h>
#include <linux/suspend.h>
#include <asm/init.h>
#include <asm/proto.h>
#include <asm/page.h>
#include <asm/pgtable.h>
@ -39,41 +41,21 @@ pgd_t *temp_level4_pgt;
void *relocated_restore_code;
static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
static void *alloc_pgt_page(void *context)
{
long i, j;
i = pud_index(address);
pud = pud + i;
for (; i < PTRS_PER_PUD; pud++, i++) {
unsigned long paddr;
pmd_t *pmd;
paddr = address + i*PUD_SIZE;
if (paddr >= end)
break;
pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
if (!pmd)
return -ENOMEM;
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
unsigned long pe;
if (paddr >= end)
break;
pe = __PAGE_KERNEL_LARGE_EXEC | paddr;
pe &= __supported_pte_mask;
set_pmd(pmd, __pmd(pe));
}
}
return 0;
return (void *)get_safe_page(GFP_ATOMIC);
}
static int set_up_temporary_mappings(void)
{
unsigned long start, end, next;
int error;
struct x86_mapping_info info = {
.alloc_pgt_page = alloc_pgt_page,
.pmd_flag = __PAGE_KERNEL_LARGE_EXEC,
.kernel_mapping = true,
};
unsigned long mstart, mend;
int result;
int i;
temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
if (!temp_level4_pgt)
@ -84,21 +66,17 @@ static int set_up_temporary_mappings(void)
init_level4_pgt[pgd_index(__START_KERNEL_map)]);
/* Set up the direct mapping from scratch */
start = (unsigned long)pfn_to_kaddr(0);
end = (unsigned long)pfn_to_kaddr(max_pfn);
for (i = 0; i < nr_pfn_mapped; i++) {
mstart = pfn_mapped[i].start << PAGE_SHIFT;
mend = pfn_mapped[i].end << PAGE_SHIFT;
for (; start < end; start = next) {
pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
if (!pud)
return -ENOMEM;
next = start + PGDIR_SIZE;
if (next > end)
next = end;
if ((error = res_phys_pud_init(pud, __pa(start), __pa(next))))
return error;
set_pgd(temp_level4_pgt + pgd_index(start),
mk_kernel_pgd(__pa(pud)));
result = kernel_ident_mapping_init(&info, temp_level4_pgt,
mstart, mend);
if (result)
return result;
}
return 0;
}