From db912f963909b3cbc3a059b7528f6a1a1eb6ffae Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Thu, 24 May 2007 12:23:10 +0300 Subject: HOTPLUG: Add CPU_DYING notifier KVM wants a notification when a cpu is about to die, so it can disable hardware extensions, but at a time when user processes cannot be scheduled on the cpu, so it doesn't try to use virtualization extensions after they have been disabled. This adds a CPU_DYING notification. The notification is called in atomic context on the doomed cpu. Signed-off-by: Avi Kivity --- include/linux/notifier.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux/notifier.h') diff --git a/include/linux/notifier.h b/include/linux/notifier.h index 9431101bf876..576f2bb34cc8 100644 --- a/include/linux/notifier.h +++ b/include/linux/notifier.h @@ -196,6 +196,8 @@ extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh, #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ #define CPU_LOCK_ACQUIRE 0x0008 /* Acquire all hotcpu locks */ #define CPU_LOCK_RELEASE 0x0009 /* Release all hotcpu locks */ +#define CPU_DYING 0x000A /* CPU (unsigned)v not running any task, + * not handling interrupts, soon dead */ /* Used for CPU hotplug events occuring while tasks are frozen due to a suspend * operation in progress @@ -208,6 +210,7 @@ extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh, #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) +#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) #endif /* __KERNEL__ */ #endif /* _LINUX_NOTIFIER_H */ -- cgit v1.2.3