![Frederic Weisbecker](/assets/img/avatar_default.png)
It makes the registration cheaper and simpler for the smpboot per-cpu kthread users that don't need to always update the cpumask after threads creation. [sfr@canb.auug.org.au: fix for allow passing the cpumask on per-cpu thread registration] Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ulrich Obergfell <uobergfe@redhat.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
66 lines
2.3 KiB
C
66 lines
2.3 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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* @pre_unpark: Optional unpark function, called before the thread is
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* unparked (cpu online). This is not guaranteed to be
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* called on the target cpu of the thread. Careful!
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* @cpumask: Internal state. To update which threads are unparked,
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* call smpboot_update_cpumask_percpu_thread().
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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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void (*pre_unpark)(unsigned int cpu);
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cpumask_var_t cpumask;
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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_cpumask(struct smp_hotplug_thread *plug_thread,
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const struct cpumask *cpumask);
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static inline int
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smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
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{
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return smpboot_register_percpu_thread_cpumask(plug_thread,
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cpu_possible_mask);
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}
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void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
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int smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread,
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const struct cpumask *);
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#endif
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