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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-07-13 20:16:34 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-15 11:40:22 +0300 |
| commit | 148b9e2abea6f50e4620e4ac0683b4913c4364c0 (patch) | |
| tree | 0e52b33b24e88eb891a434518a25a5e01c858ada | |
| parent | 251a5fd64b720a0646eddb8c54f5e9ddba066e72 (diff) | |
| download | linux-148b9e2abea6f50e4620e4ac0683b4913c4364c0.tar.xz | |
x86/apb_timer: Convert to hotplug state machine
Install the callbacks via the state machine. There is no setup just one
teardown callback. Remove the silly comment about the workqueue up dependency.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153335.625342983@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/kernel/apb_timer.c | 29 | ||||
| -rw-r--r-- | include/linux/cpuhotplug.h | 1 |
2 files changed, 11 insertions, 19 deletions
diff --git a/arch/x86/kernel/apb_timer.c b/arch/x86/kernel/apb_timer.c index cefacbad1531..456316f6c868 100644 --- a/arch/x86/kernel/apb_timer.c +++ b/arch/x86/kernel/apb_timer.c @@ -215,26 +215,18 @@ void apbt_setup_secondary_clock(void) * cpu timers during the offline process due to the ordering of notification. * the extra interrupt is harmless. */ -static int apbt_cpuhp_notify(struct notifier_block *n, - unsigned long action, void *hcpu) +static int apbt_cpu_dead(unsigned int cpu) { - unsigned long cpu = (unsigned long)hcpu; struct apbt_dev *adev = &per_cpu(cpu_apbt_dev, cpu); - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_DEAD: - dw_apb_clockevent_pause(adev->timer); - if (system_state == SYSTEM_RUNNING) { - pr_debug("skipping APBT CPU %lu offline\n", cpu); - } else { - pr_debug("APBT clockevent for cpu %lu offline\n", cpu); - dw_apb_clockevent_stop(adev->timer); - } - break; - default: - pr_debug("APBT notified %lu, no action\n", action); + dw_apb_clockevent_pause(adev->timer); + if (system_state == SYSTEM_RUNNING) { + pr_debug("skipping APBT CPU %u offline\n", cpu); + } else { + pr_debug("APBT clockevent for cpu %u offline\n", cpu); + dw_apb_clockevent_stop(adev->timer); } - return NOTIFY_OK; + return 0; } static __init int apbt_late_init(void) @@ -242,9 +234,8 @@ static __init int apbt_late_init(void) if (intel_mid_timer_options == INTEL_MID_TIMER_LAPIC_APBT || !apb_timer_block_enabled) return 0; - /* This notifier should be called after workqueue is ready */ - hotcpu_notifier(apbt_cpuhp_notify, -20); - return 0; + return cpuhp_setup_state(CPUHP_X86_APB_DEAD, "X86_APB_DEAD", NULL, + apbt_cpu_dead); } fs_initcall(apbt_late_init); #else diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 8c190a85af6e..3e719ba44fbe 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -13,6 +13,7 @@ enum cpuhp_state { CPUHP_PERF_POWER, CPUHP_PERF_SUPERH, CPUHP_X86_HPET_DEAD, + CPUHP_X86_APB_DEAD, CPUHP_WORKQUEUE_PREP, CPUHP_NOTIFY_PREPARE, CPUHP_BRINGUP_CPU, |