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arm/twd: Convert to hotplug state machine 

Install the callbacks via the state machine. The callbacks won't be invoked on
already online CPUs.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Eric Anholt <eric@anholt.net>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153336.881124821@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Richard Cochran 2016-07-13 17:16:51 +00:00 committed by Ingo Molnar
parent 9eeb226477
commit 26b8768868
2 changed files with 12 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
arch/arm/kernel/smp_twd.c
View File

@ -310,24 +310,17 @@ static void twd_timer_setup(void)
enable_percpu_irq(clk->irq, 0);
}
static int twd_timer_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
static int twd_timer_starting_cpu(unsigned int cpu)
{
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_STARTING:
twd_timer_setup();
break;
case CPU_DYING:
twd_timer_stop();
break;
}
return NOTIFY_OK;
twd_timer_setup();
return 0;
}
static struct notifier_block twd_timer_cpu_nb = {
.notifier_call = twd_timer_cpu_notify,
};
static int twd_timer_dying_cpu(unsigned int cpu)
{
twd_timer_stop();
return 0;
}
static int __init twd_local_timer_common_register(struct device_node *np)
{
@ -345,9 +338,9 @@ static int __init twd_local_timer_common_register(struct device_node *np)
goto out_free;
}
err = register_cpu_notifier(&twd_timer_cpu_nb);
if (err)
goto out_irq;
cpuhp_setup_state_nocalls(CPUHP_AP_ARM_TWD_STARTING,
"AP_ARM_TWD_STARTING",
twd_timer_starting_cpu, twd_timer_dying_cpu);
twd_get_clock(np);
if (!of_property_read_bool(np, "always-on"))
@ -365,8 +358,6 @@ static int __init twd_local_timer_common_register(struct device_node *np)
return 0;
out_irq:
free_percpu_irq(twd_ppi, twd_evt);
out_free:
iounmap(twd_base);
twd_base = NULL;

1
include/linux/cpuhotplug.h
View File

@ -40,6 +40,7 @@ enum cpuhp_state {
CPUHP_AP_ARM_L2X0_STARTING,
CPUHP_AP_ARM_ARCH_TIMER_STARTING,
CPUHP_AP_DUMMY_TIMER_STARTING,
CPUHP_AP_ARM_TWD_STARTING,
CPUHP_AP_METAG_TIMER_STARTING,
CPUHP_AP_QCOM_TIMER_STARTING,
CPUHP_AP_MIPS_GIC_TIMER_STARTING,