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PM / hibernate: Simplify mark_unsafe_pages() 

Rework mark_unsafe_pages() to use a simpler method of clearing
all bits in free_pages_map and to set the bits for the "unsafe"
pages (ie. pages that were used by the image kernel before
hibernation) with the help of duplicate_memory_bitmap().

For this purpose, move the pfn_valid() check from mark_unsafe_pages()
to unpack_orig_pfns() where the "unsafe" pages are discovered.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2016-06-29 03:02:16 +02:00
parent 9c744481c0
commit 6dbecfd345
1 changed files with 28 additions and 42 deletions
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70
kernel/power/snapshot.c
View File

@ -2019,44 +2019,8 @@ int snapshot_read_next(struct snapshot_handle *handle)
return PAGE_SIZE;
}
/**
* mark_unsafe_pages - mark the pages that cannot be used for storing
* the image during resume, because they conflict with the pages that
* had been used before suspend
*/
static int mark_unsafe_pages(struct memory_bitmap *bm)
{
struct zone *zone;
unsigned long pfn, max_zone_pfn;
/* Clear page flags */
for_each_populated_zone(zone) {
max_zone_pfn = zone_end_pfn(zone);
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
if (pfn_valid(pfn))
swsusp_unset_page_free(pfn_to_page(pfn));
}
/* Mark pages that correspond to the "original" pfns as "unsafe" */
memory_bm_position_reset(bm);
do {
pfn = memory_bm_next_pfn(bm);
if (likely(pfn != BM_END_OF_MAP)) {
if (likely(pfn_valid(pfn)))
swsusp_set_page_free(pfn_to_page(pfn));
else
return -EFAULT;
}
} while (pfn != BM_END_OF_MAP);
allocated_unsafe_pages = 0;
return 0;
}
static void
duplicate_memory_bitmap(struct memory_bitmap *dst, struct memory_bitmap *src)
static void duplicate_memory_bitmap(struct memory_bitmap *dst,
struct memory_bitmap *src)
{
unsigned long pfn;
@ -2068,6 +2032,30 @@ duplicate_memory_bitmap(struct memory_bitmap *dst, struct memory_bitmap *src)
}
}
/**
* mark_unsafe_pages - mark the pages that cannot be used for storing
* the image during resume, because they conflict with the pages that
* had been used before suspend
*/
static void mark_unsafe_pages(struct memory_bitmap *bm)
{
unsigned long pfn;
/* Clear the "free"/"unsafe" bit for all PFNs */
memory_bm_position_reset(free_pages_map);
pfn = memory_bm_next_pfn(free_pages_map);
while (pfn != BM_END_OF_MAP) {
memory_bm_clear_current(free_pages_map);
pfn = memory_bm_next_pfn(free_pages_map);
}
/* Mark pages that correspond to the "original" PFNs as "unsafe" */
duplicate_memory_bitmap(free_pages_map, bm);
allocated_unsafe_pages = 0;
}
static int check_header(struct swsusp_info *info)
{
char *reason;
@ -2115,7 +2103,7 @@ static int unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm)
/* Extract and buffer page key for data page (s390 only). */
page_key_memorize(buf + j);
if (memory_bm_pfn_present(bm, buf[j]))
if (pfn_valid(buf[j]) && memory_bm_pfn_present(bm, buf[j]))
memory_bm_set_bit(bm, buf[j]);
else
return -EFAULT;
@ -2357,9 +2345,7 @@ prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm)
buffer = NULL;
nr_highmem = count_highmem_image_pages(bm);
error = mark_unsafe_pages(bm);
if (error)
goto Free;
mark_unsafe_pages(bm);
error = memory_bm_create(new_bm, GFP_ATOMIC, PG_SAFE);
if (error)