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0d85923c7a
smpboot_update_cpumask_threads_percpu() allocates a temporary cpumask at runtime. This is suboptimal because the call site needs more code size for proper error handling than a statically allocated temporary mask requires data size. Add static temporary cpumask. The function is globaly serialized, so no further protection required. Remove the half baken error handling in the watchdog code and get rid of the export as there are no in tree modular users of that function. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Don Zickus <dzickus@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Ulrich Obergfell <uobergfe@redhat.com> Link: http://lkml.kernel.org/r/20170912194147.297288838@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
61 lines
2.1 KiB
C
61 lines
2.1 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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* @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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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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void 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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