From 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 9 May 2007 02:35:10 -0700 Subject: 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 Cc: Gautham R Shenoy Cc: Pavel Machek Signed-off-by: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/workqueue.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'kernel/workqueue.c') diff --git a/kernel/workqueue.c b/kernel/workqueue.c index b976ed87dd37..fb56fedd5c02 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -799,6 +799,8 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb, struct cpu_workqueue_struct *cwq; struct workqueue_struct *wq; + action &= ~CPU_TASKS_FROZEN; + switch (action) { case CPU_LOCK_ACQUIRE: mutex_lock(&workqueue_mutex); -- cgit v1.2.3