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e69aab1311
Kill the busy spinning on the control side and just wait for the hotplugged cpu to tell that it reached the dead state. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arch@vger.kernel.org Cc: Rik van Riel <riel@redhat.com> Cc: Rafael Wysocki <rafael.j.wysocki@intel.com> Cc: "Srivatsa S. Bhat" <srivatsa@mit.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul Turner <pjt@google.com> Link: http://lkml.kernel.org/r/20160226182341.776157858@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
#ifndef __CPUHOTPLUG_H
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#define __CPUHOTPLUG_H
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enum cpuhp_state {
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CPUHP_OFFLINE,
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CPUHP_CREATE_THREADS,
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CPUHP_NOTIFY_PREPARE,
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CPUHP_BRINGUP_CPU,
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CPUHP_AP_IDLE_DEAD,
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CPUHP_AP_OFFLINE,
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CPUHP_AP_NOTIFY_STARTING,
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CPUHP_AP_ONLINE,
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CPUHP_TEARDOWN_CPU,
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CPUHP_AP_ONLINE_IDLE,
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CPUHP_AP_SMPBOOT_THREADS,
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CPUHP_AP_NOTIFY_ONLINE,
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CPUHP_AP_ONLINE_DYN,
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CPUHP_AP_ONLINE_DYN_END = CPUHP_AP_ONLINE_DYN + 30,
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CPUHP_ONLINE,
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};
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int __cpuhp_setup_state(enum cpuhp_state state, const char *name, bool invoke,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu));
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/**
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* cpuhp_setup_state - Setup hotplug state callbacks with calling the callbacks
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* @state: The state for which the calls are installed
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* @name: Name of the callback (will be used in debug output)
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* @startup: startup callback function
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* @teardown: teardown callback function
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*
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* Installs the callback functions and invokes the startup callback on
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* the present cpus which have already reached the @state.
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*/
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static inline int cpuhp_setup_state(enum cpuhp_state state,
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const char *name,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu))
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{
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return __cpuhp_setup_state(state, name, true, startup, teardown);
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}
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/**
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* cpuhp_setup_state_nocalls - Setup hotplug state callbacks without calling the
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* callbacks
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* @state: The state for which the calls are installed
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* @name: Name of the callback.
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* @startup: startup callback function
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* @teardown: teardown callback function
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*
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* Same as @cpuhp_setup_state except that no calls are executed are invoked
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* during installation of this callback. NOP if SMP=n or HOTPLUG_CPU=n.
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*/
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static inline int cpuhp_setup_state_nocalls(enum cpuhp_state state,
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const char *name,
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int (*startup)(unsigned int cpu),
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int (*teardown)(unsigned int cpu))
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{
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return __cpuhp_setup_state(state, name, false, startup, teardown);
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}
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void __cpuhp_remove_state(enum cpuhp_state state, bool invoke);
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/**
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* cpuhp_remove_state - Remove hotplug state callbacks and invoke the teardown
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* @state: The state for which the calls are removed
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*
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* Removes the callback functions and invokes the teardown callback on
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* the present cpus which have already reached the @state.
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*/
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static inline void cpuhp_remove_state(enum cpuhp_state state)
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{
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__cpuhp_remove_state(state, true);
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}
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/**
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* cpuhp_remove_state_nocalls - Remove hotplug state callbacks without invoking
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* teardown
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* @state: The state for which the calls are removed
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*/
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static inline void cpuhp_remove_state_nocalls(enum cpuhp_state state)
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{
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__cpuhp_remove_state(state, false);
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}
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#ifdef CONFIG_SMP
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void cpuhp_online_idle(enum cpuhp_state state);
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#else
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static inline void cpuhp_online_idle(enum cpuhp_state state) { }
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#endif
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#endif
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