7d7e499f73
The stop machine threads are still killed when a cpu goes offline. The reason is that the thread is used to bring the cpu down, so it can't be parked along with the other per cpu threads. Allow a per cpu thread to be excluded from automatic parking, so it can park itself once it's done Add a create callback function as well. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Arjan van de Veen <arjan@infradead.org> Cc: Paul Turner <pjt@google.com> Cc: Richard Weinberger <rw@linutronix.de> Cc: Magnus Damm <magnus.damm@gmail.com> Link: http://lkml.kernel.org/r/20130131120741.553993267@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
#ifndef _LINUX_SMPBOOT_H
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#define _LINUX_SMPBOOT_H
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#include <linux/types.h>
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struct task_struct;
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/* Cookie handed to the thread_fn*/
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struct smpboot_thread_data;
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/**
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* struct smp_hotplug_thread - CPU hotplug related thread descriptor
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* @store: Pointer to per cpu storage for the task pointers
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* @list: List head for core management
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* @thread_should_run: Check whether the thread should run or not. Called with
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* preemption disabled.
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* @thread_fn: The associated thread function
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* @create: Optional setup function, called when the thread gets
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* created (Not called from the thread context)
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* @setup: Optional setup function, called when the thread gets
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* operational the first time
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* @cleanup: Optional cleanup function, called when the thread
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* should stop (module exit)
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* @park: Optional park function, called when the thread is
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* parked (cpu offline)
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* @unpark: Optional unpark function, called when the thread is
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* unparked (cpu online)
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* @selfparking: Thread is not parked by the park function.
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* @thread_comm: The base name of the thread
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*/
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struct smp_hotplug_thread {
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struct task_struct __percpu **store;
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struct list_head list;
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int (*thread_should_run)(unsigned int cpu);
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void (*thread_fn)(unsigned int cpu);
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void (*create)(unsigned int cpu);
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void (*setup)(unsigned int cpu);
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void (*cleanup)(unsigned int cpu, bool online);
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void (*park)(unsigned int cpu);
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void (*unpark)(unsigned int cpu);
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bool selfparking;
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const char *thread_comm;
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};
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int smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread);
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void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
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int smpboot_thread_schedule(void);
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#endif
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