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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2009-07-22 00:36:56 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2009-09-14 20:26:59 +0200
commit98e73dc5d2dadfcb95305ad71ac9239f4e361870 (patch)
treef6a0b8098b02d2ef8e673ceef34150df55425ce7
parentef4aede3f10d82adef1fb044b565ba5f08f851e0 (diff)
downloadvexpress-lsk-98e73dc5d2dadfcb95305ad71ac9239f4e361870.tar.gz
PM / Hibernate / Memory hotplug: Always use for_each_populated_zone()
Use for_each_populated_zone() instead of for_each_zone() in hibernation code. This fixes a bug on s390, where we allow both config options HIBERNATION and MEMORY_HOTPLUG, so that we also have a ZONE_MOVABLE here. We only allow hibernation if no memory hotplug operation was performed, so in fact both features can only be used exclusively, but this way we don't need 2 differently configured (distribution) kernels. If we have an unpopulated ZONE_MOVABLE, we allow hibernation but run into a BUG_ON() in memory_bm_test/set/clear_bit() because hibernation code iterates through all zones, not only the populated zones, in several places. For example, swsusp_free() does for_each_zone() and then checks for pfn_valid(), which is true even if the zone is not populated, resulting in a BUG_ON() later because the pfn cannot be found in the memory bitmap. Replacing all occurences of for_each_zone() in hibernation code with for_each_populated_zone() would fix this issue. [rjw: Rebased on top of linux-next hibernation patches.] Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
-rw-r--r--kernel/power/snapshot.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 0a06b114dd3..bf06658f205 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -853,7 +853,7 @@ static unsigned int count_highmem_pages(void)
struct zone *zone;
unsigned int n = 0;
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
unsigned long pfn, max_zone_pfn;
if (!is_highmem(zone))
@@ -916,7 +916,7 @@ static unsigned int count_data_pages(void)
unsigned long pfn, max_zone_pfn;
unsigned int n = 0;
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
if (is_highmem(zone))
continue;
@@ -1010,7 +1010,7 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm)
struct zone *zone;
unsigned long pfn;
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
unsigned long max_zone_pfn;
mark_free_pages(zone);
@@ -1065,7 +1065,7 @@ void swsusp_free(void)
struct zone *zone;
unsigned long pfn, max_zone_pfn;
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
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)) {
@@ -1397,7 +1397,7 @@ static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
struct zone *zone;
unsigned int free = alloc_normal;
- for_each_zone(zone)
+ for_each_populated_zone(zone)
if (!is_highmem(zone))
free += zone_page_state(zone, NR_FREE_PAGES);
@@ -1688,7 +1688,7 @@ static int mark_unsafe_pages(struct memory_bitmap *bm)
unsigned long pfn, max_zone_pfn;
/* Clear page flags */
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
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))