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, 1 insertions, 1 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index fc2d763a8d78..aecd057cd0e0 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2946,7 +2946,7 @@ static void buffer_exit_cpu(int cpu)
 static int buffer_cpu_notify(struct notifier_block *self,
                               unsigned long action, void *hcpu)
 {
-        if (action == CPU_DEAD)
+        if (action == CPU_DEAD || action == CPU_DEAD_FROZEN)
                 buffer_exit_cpu((unsigned long)hcpu);
         return NOTIFY_OK;
 }