Add suspend-related notifications for CPU hotplug

Since nonboot CPUs are now disabled after tasks and devices have been
frozen and the CPU hotplug infrastructure is used for this purpose, we need
special CPU hotplug notifications that will help the CPU-hotplug-aware
subsystems distinguish normal CPU hotplug events from CPU hotplug events
related to a system-wide suspend or resume operation in progress.  This
patch introduces such notifications and causes them to be used during
suspend and resume transitions.  It also changes all of the
CPU-hotplug-aware subsystems to take these notifications into consideration
(for now they are handled in the same way as the corresponding "normal"
ones).

[oleg@tv-sign.ru: cleanups]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6fd0b7455b0b..d53cbf8acb8e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2148,11 +2148,14 @@ static int __cpuinit pageset_cpuup_callback(struct notifier_block *nfb,
 
         switch (action) {
         case CPU_UP_PREPARE:
+        case CPU_UP_PREPARE_FROZEN:
                 if (process_zones(cpu))
                         ret = NOTIFY_BAD;
                 break;
         case CPU_UP_CANCELED:
+        case CPU_UP_CANCELED_FROZEN:
         case CPU_DEAD:
+        case CPU_DEAD_FROZEN:
                 free_zone_pagesets(cpu);
                 break;
         default:
@@ -3012,7 +3015,7 @@ static int page_alloc_cpu_notify(struct notifier_block *self,
 {
         int cpu = (unsigned long)hcpu;
 
-        if (action == CPU_DEAD) {
+        if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
                 local_irq_disable();
                 __drain_pages(cpu);
                 vm_events_fold_cpu(cpu);