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smpboot: allow passing the cpumask on per-cpu thread registration

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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>
This commit is contained in:
Frederic Weisbecker 2015-09-04 15:45:06 -07:00 committed by Linus Torvalds
parent 3dd08c0c91
commit 230ec93909
3 changed files with 22 additions and 12 deletions
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11
include/linux/smpboot.h
View File

@ -48,7 +48,16 @@ struct smp_hotplug_thread {
const char *thread_comm;
};
int smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread);
int smpboot_register_percpu_thread_cpumask(struct smp_hotplug_thread *plug_thread,
const struct cpumask *cpumask);
static inline int
smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
{
return smpboot_register_percpu_thread_cpumask(plug_thread,
cpu_possible_mask);
}
void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
int smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread,
const struct cpumask *);

14
kernel/smpboot.c
View File

@ -273,19 +273,22 @@ static void smpboot_destroy_threads(struct smp_hotplug_thread *ht)
}
/**
* smpboot_register_percpu_thread - Register a per_cpu thread related to hotplug
* smpboot_register_percpu_thread_cpumask - Register a per_cpu thread related
* to hotplug
* @plug_thread: Hotplug thread descriptor
* @cpumask: The cpumask where threads run
*
* Creates and starts the threads on all online cpus.
*/
int smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
int smpboot_register_percpu_thread_cpumask(struct smp_hotplug_thread *plug_thread,
const struct cpumask *cpumask)
{
unsigned int cpu;
int ret = 0;
if (!alloc_cpumask_var(&plug_thread->cpumask, GFP_KERNEL))
return -ENOMEM;
cpumask_copy(plug_thread->cpumask, cpu_possible_mask);
cpumask_copy(plug_thread->cpumask, cpumask);
get_online_cpus();
mutex_lock(&smpboot_threads_lock);
@ -296,7 +299,8 @@ int smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
free_cpumask_var(plug_thread->cpumask);
goto out;
}
smpboot_unpark_thread(plug_thread, cpu);
if (cpumask_test_cpu(cpu, cpumask))
smpboot_unpark_thread(plug_thread, cpu);
}
list_add(&plug_thread->list, &hotplug_threads);
out:
@ -304,7 +308,7 @@ int smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
put_online_cpus();
return ret;
}
EXPORT_SYMBOL_GPL(smpboot_register_percpu_thread);
EXPORT_SYMBOL_GPL(smpboot_register_percpu_thread_cpumask);
/**
* smpboot_unregister_percpu_thread - Unregister a per_cpu thread related to hotplug

9
kernel/watchdog.c
View File

@ -713,15 +713,12 @@ static int watchdog_enable_all_cpus(void)
int err = 0;
if (!watchdog_running) {
err = smpboot_register_percpu_thread(&watchdog_threads);
err = smpboot_register_percpu_thread_cpumask(&watchdog_threads,
&watchdog_cpumask);
if (err)
pr_err("Failed to create watchdog threads, disabled\n");
else {
if (smpboot_update_cpumask_percpu_thread(
&watchdog_threads, &watchdog_cpumask))
pr_err("Failed to set cpumask for watchdog threads\n");
else
watchdog_running = 1;
}
} else {
/*
* Enable/disable the lockup detectors or