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hrtimer: Convert to hotplug state machine 

Split out the clockevents callbacks instead of piggybacking them on
hrtimers.

This gets rid of a POST_DEAD user. See commit:

  54e88fad22 ("sched: Make sure timers have migrated before killing the migration_thread")

We just move the callback state to the proper place in the state machine.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153337.485419196@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2016-07-15 10:41:04 +02:00 committed by Ingo Molnar
parent ae6a8a2ed7
commit 27590dc17b
4 changed files with 18 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/cpuhotplug.h
View File

@ -15,6 +15,7 @@ enum cpuhp_state {
CPUHP_X86_HPET_DEAD,
CPUHP_X86_APB_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_HRTIMERS_PREPARE,
CPUHP_NOTIFY_PREPARE,
CPUHP_BRINGUP_CPU,
CPUHP_AP_IDLE_DEAD,

7
include/linux/hrtimer.h
View File

@ -494,4 +494,11 @@ extern void __init hrtimers_init(void);
/* Show pending timers: */
extern void sysrq_timer_list_show(void);
int hrtimers_prepare_cpu(unsigned int cpu);
#ifdef CONFIG_HOTPLUG_CPU
int hrtimers_dead_cpu(unsigned int cpu);
#else
#define hrtimers_dead_cpu NULL
#endif
#endif

5
kernel/cpu.c
View File

@ -1190,6 +1190,11 @@ static struct cpuhp_step cpuhp_bp_states[] = {
.startup = workqueue_prepare_cpu,
.teardown = NULL,
},
[CPUHP_HRTIMERS_PREPARE] = {
.name = "hrtimers prepare",
.startup = hrtimers_prepare_cpu,
.teardown = hrtimers_dead_cpu,
},
/*
* Preparatory and dead notifiers. Will be replaced once the notifiers
* are converted to states.

40
kernel/time/hrtimer.c
View File

@ -1590,7 +1590,7 @@ SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
/*
* Functions related to boot-time initialization:
*/
static void init_hrtimers_cpu(int cpu)
int hrtimers_prepare_cpu(unsigned int cpu)
{
struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
int i;
@ -1602,6 +1602,7 @@ static void init_hrtimers_cpu(int cpu)
cpu_base->cpu = cpu;
hrtimer_init_hres(cpu_base);
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
@ -1636,7 +1637,7 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
}
}
static void migrate_hrtimers(int scpu)
int hrtimers_dead_cpu(unsigned int scpu)
{
struct hrtimer_cpu_base *old_base, *new_base;
int i;
@ -1665,45 +1666,14 @@ static void migrate_hrtimers(int scpu)
/* Check, if we got expired work to do */
__hrtimer_peek_ahead_timers();
local_irq_enable();
return 0;
}
#endif /* CONFIG_HOTPLUG_CPU */
static int hrtimer_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
int scpu = (long)hcpu;
switch (action) {
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
init_hrtimers_cpu(scpu);
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_DEAD:
case CPU_DEAD_FROZEN:
migrate_hrtimers(scpu);
break;
#endif
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block hrtimers_nb = {
.notifier_call = hrtimer_cpu_notify,
};
void __init hrtimers_init(void)
{
hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
(void *)(long)smp_processor_id());
register_cpu_notifier(&hrtimers_nb);
hrtimers_prepare_cpu(smp_processor_id());
}
/**