Messages in this thread Patch in this message | | | Subject | [PATCH 1/5] hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPLUG_CPU | From | Avi Kivity <> | Date | Tue, 30 Jan 2007 14:53:16 -0000 |
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KVM wants the cpu hotplug notifications, both for cpu hotplug itself, but more commonly for host suspend/resume.
In order to avoid extensive #ifdefs, provide stubs when CONFIG_CPU_HOTPLUG is not defined.
In all, we have four cases:
- UP: register and unregister stubbed out - SMP+hotplug: full register and unregister - SMP, no hotplug, core: register as __init, unregister stubbed (cpus are brought up during core initialization) - SMP, no hotplug, module: register and unregister stubbed out (cpus cannot be brought up during module lifetime)
Signed-off-by: Avi Kivity <avi@qumranet.com>
Index: linux-2.6/include/linux/cpu.h =================================================================== --- linux-2.6.orig/include/linux/cpu.h +++ linux-2.6/include/linux/cpu.h @@ -49,10 +49,20 @@ struct notifier_block; #ifdef CONFIG_SMP /* Need to know about CPUs going up/down? */ -extern int register_cpu_notifier(struct notifier_block *nb); #ifdef CONFIG_HOTPLUG_CPU +extern int register_cpu_notifier(struct notifier_block *nb); extern void unregister_cpu_notifier(struct notifier_block *nb); #else + +#ifndef MODULE +extern int register_cpu_notifier(struct notifier_block *nb); +#else +static inline int register_cpu_notifier(struct notifier_block *nb) +{ + return 0; +} +#endif + static inline void unregister_cpu_notifier(struct notifier_block *nb) { } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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