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| author |   Avi Kivity <avi@qumranet.com> | 2007-05-24 12:23:10 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-07-16 12:05:49 +0300 |
| commit | db912f963909b3cbc3a059b7528f6a1a1eb6ffae (patch) | |
| tree | 85d112b2879782fda2b2ca77413ac73361d0d3b0 /include/linux/notifier.h | |
| parent | KVM: Clean up #includes (diff) | |
| download | linux-dev-db912f963909b3cbc3a059b7528f6a1a1eb6ffae.tar.xz linux-dev-db912f963909b3cbc3a059b7528f6a1a1eb6ffae.zip | |
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 <avi@qumranet.com>
Diffstat (limited to 'include/linux/notifier.h')
| -rw-r--r-- | include/linux/notifier.h | 3 |
1 files changed, 3 insertions, 0 deletions
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 */ |