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[PATCH] swsusp: clean up browsing of pfns

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Clean up some loops over pfns for each zone in snapshot.c: reduce the
number of additions to perform, rework detection of saveable pages and make
the code a bit less difficult to understand, hopefully.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki 2006-09-25 23:32:45 -07:00 committed by Linus Torvalds
parent 546e0d2719
commit ae83c5eef5
1 changed files with 35 additions and 33 deletions
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68
kernel/power/snapshot.c
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@ -156,7 +156,7 @@ static inline int save_highmem(void) {return 0;}
static inline int restore_highmem(void) {return 0;}
#endif
static int pfn_is_nosave(unsigned long pfn)
static inline int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
@ -167,43 +167,43 @@ static int pfn_is_nosave(unsigned long pfn)
* saveable - Determine whether a page should be cloned or not.
* @pfn: The page
*
* We save a page if it's Reserved, and not in the range of pages
* statically defined as 'unsaveable', or if it isn't reserved, and
* isn't part of a free chunk of pages.
* We save a page if it isn't Nosave, and is not in the range of pages
* statically defined as 'unsaveable', and it
* isn't a part of a free chunk of pages.
*/
static int saveable(struct zone *zone, unsigned long *zone_pfn)
static struct page *saveable_page(unsigned long pfn)
{
unsigned long pfn = *zone_pfn + zone->zone_start_pfn;
struct page *page;
if (!pfn_valid(pfn))
return 0;
return NULL;
page = pfn_to_page(pfn);
BUG_ON(PageReserved(page) && PageNosave(page));
if (PageNosave(page))
return 0;
if (PageReserved(page) && pfn_is_nosave(pfn))
return 0;
if (PageNosaveFree(page))
return 0;
return 1;
if (PageNosave(page))
return NULL;
if (PageReserved(page) && pfn_is_nosave(pfn))
return NULL;
if (PageNosaveFree(page))
return NULL;
return page;
}
unsigned int count_data_pages(void)
{
struct zone *zone;
unsigned long zone_pfn;
unsigned long pfn, max_zone_pfn;
unsigned int n = 0;
for_each_zone (zone) {
if (is_highmem(zone))
continue;
mark_free_pages(zone);
for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
n += saveable(zone, &zone_pfn);
max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
n += !!saveable_page(pfn);
}
return n;
}
@ -211,7 +211,7 @@ unsigned int count_data_pages(void)
static void copy_data_pages(struct pbe *pblist)
{
struct zone *zone;
unsigned long zone_pfn;
unsigned long pfn, max_zone_pfn;
struct pbe *pbe, *p;
pbe = pblist;
@ -224,13 +224,14 @@ static void copy_data_pages(struct pbe *pblist)
SetPageNosaveFree(virt_to_page(p));
for_each_pbe (p, pblist)
SetPageNosaveFree(virt_to_page(p->address));
for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) {
if (saveable(zone, &zone_pfn)) {
struct page *page;
max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {
struct page *page = saveable_page(pfn);
if (page) {
long *src, *dst;
int n;
page = pfn_to_page(zone_pfn + zone->zone_start_pfn);
BUG_ON(!pbe);
pbe->orig_address = (unsigned long)page_address(page);
/* copy_page and memcpy are not usable for copying task structs. */
@ -383,13 +384,14 @@ static struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask,
void swsusp_free(void)
{
struct zone *zone;
unsigned long zone_pfn;
unsigned long pfn, max_zone_pfn;
for_each_zone(zone) {
for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
if (pfn_valid(zone_pfn + zone->zone_start_pfn)) {
struct page *page;
page = pfn_to_page(zone_pfn + zone->zone_start_pfn);
max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
if (PageNosave(page) && PageNosaveFree(page)) {
ClearPageNosave(page);
ClearPageNosaveFree(page);
@ -598,7 +600,7 @@ int snapshot_read_next(struct snapshot_handle *handle, size_t count)
static int mark_unsafe_pages(struct pbe *pblist)
{
struct zone *zone;
unsigned long zone_pfn;
unsigned long pfn, max_zone_pfn;
struct pbe *p;
if (!pblist) /* a sanity check */
@ -606,10 +608,10 @@ static int mark_unsafe_pages(struct pbe *pblist)
/* Clear page flags */
for_each_zone (zone) {
for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
if (pfn_valid(zone_pfn + zone->zone_start_pfn))
ClearPageNosaveFree(pfn_to_page(zone_pfn +
zone->zone_start_pfn));
max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
if (pfn_valid(pfn))
ClearPageNosaveFree(pfn_to_page(pfn));
}
/* Mark orig addresses */