Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753997Ab2F1LZw (ORCPT ); Thu, 28 Jun 2012 07:25:52 -0400 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:52173 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751473Ab2F1LZu (ORCPT ); Thu, 28 Jun 2012 07:25:50 -0400 Message-ID: <4FEC3EF7.5020208@linux.vnet.ibm.com> Date: Thu, 28 Jun 2012 16:54:39 +0530 From: "Srivatsa S. Bhat" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 MIME-Version: 1.0 To: Daniel Lezcano CC: trenn@suse.de, deepthi@linux.vnet.ibm.com, linux-acpi@vger.kernel.org, linux-pm@lists.linux-foundation.org, linux-pm@vger.kernel.org, lenb@kernel.org, rjw@sisk.pl, x86@kernel.org, linux-kernel@vger.kernel.org, linaro-dev@lists.linaro.org Subject: Re: [PATCH v2] acpi: intel_idle : break dependency between modules References: <201206271506.29034.trenn@suse.de> <1340873202-2476-1-git-send-email-daniel.lezcano@linaro.org> In-Reply-To: <1340873202-2476-1-git-send-email-daniel.lezcano@linaro.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit x-cbid: 12062801-7014-0000-0000-0000017633CD Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5920 Lines: 173 On 06/28/2012 02:16 PM, Daniel Lezcano wrote: > When the system is booted with some cpus offline, the idle > driver is not initialized. When a cpu is set online, the > acpi code call the intel idle init function. Unfortunately > this code introduce a dependency between intel_idle and acpi. > > This patch is intended to remove this dependency by using the > notifier of intel_idle. This patch has the benefit of > encapsulating the intel_idle driver and remove some exported > functions. > > Signed-off-by: Daniel Lezcano Looks good to me. Regards, Srivatsa S. Bhat > --- > drivers/acpi/processor_driver.c | 7 ------ > drivers/idle/intel_idle.c | 41 +++++++++++++++++++++++++------------- > include/linux/cpuidle.h | 7 ------ > 3 files changed, 27 insertions(+), 28 deletions(-) > > diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c > index 0734086..8648b29 100644 > --- a/drivers/acpi/processor_driver.c > +++ b/drivers/acpi/processor_driver.c > @@ -427,18 +427,11 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb, > * Initialize missing things > */ > if (pr->flags.need_hotplug_init) { > - struct cpuidle_driver *idle_driver = > - cpuidle_get_driver(); > - > printk(KERN_INFO "Will online and init hotplugged " > "CPU: %d\n", pr->id); > WARN(acpi_processor_start(pr), "Failed to start CPU:" > " %d\n", pr->id); > pr->flags.need_hotplug_init = 0; > - if (idle_driver && !strcmp(idle_driver->name, > - "intel_idle")) { > - intel_idle_cpu_init(pr->id); > - } > /* Normal CPU soft online event */ > } else { > acpi_processor_ppc_has_changed(pr, 0); > diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c > index d0f59c3..fe95d54 100644 > --- a/drivers/idle/intel_idle.c > +++ b/drivers/idle/intel_idle.c > @@ -96,6 +96,7 @@ static const struct idle_cpu *icpu; > static struct cpuidle_device __percpu *intel_idle_cpuidle_devices; > static int intel_idle(struct cpuidle_device *dev, > struct cpuidle_driver *drv, int index); > +static int intel_idle_cpu_init(int cpu); > > static struct cpuidle_state *cpuidle_state_table; > > @@ -302,22 +303,35 @@ static void __setup_broadcast_timer(void *arg) > clockevents_notify(reason, &cpu); > } > > -static int setup_broadcast_cpuhp_notify(struct notifier_block *n, > - unsigned long action, void *hcpu) > +static int cpu_hotplug_notify(struct notifier_block *n, > + unsigned long action, void *hcpu) > { > int hotcpu = (unsigned long)hcpu; > + struct cpuidle_device *dev; > > switch (action & 0xf) { > case CPU_ONLINE: > - smp_call_function_single(hotcpu, __setup_broadcast_timer, > - (void *)true, 1); > + > + if (lapic_timer_reliable_states != LAPIC_TIMER_ALWAYS_RELIABLE) > + smp_call_function_single(hotcpu, __setup_broadcast_timer, > + (void *)true, 1); > + > + /* > + * Some systems can hotplug a cpu at runtime after > + * the kernel has booted, we have to initialize the > + * driver in this case > + */ > + dev = per_cpu_ptr(intel_idle_cpuidle_devices, hotcpu); > + if (!dev->registered) > + intel_idle_cpu_init(hotcpu); > + > break; > } > return NOTIFY_OK; > } > > -static struct notifier_block setup_broadcast_notifier = { > - .notifier_call = setup_broadcast_cpuhp_notify, > +static struct notifier_block cpu_hotplug_notifier = { > + .notifier_call = cpu_hotplug_notify, > }; > > static void auto_demotion_disable(void *dummy) > @@ -405,10 +419,10 @@ static int intel_idle_probe(void) > > if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */ > lapic_timer_reliable_states = LAPIC_TIMER_ALWAYS_RELIABLE; > - else { > + else > on_each_cpu(__setup_broadcast_timer, (void *)true, 1); > - register_cpu_notifier(&setup_broadcast_notifier); > - } > + > + register_cpu_notifier(&cpu_hotplug_notifier); > > pr_debug(PREFIX "v" INTEL_IDLE_VERSION > " model 0x%X\n", boot_cpu_data.x86_model); > @@ -494,7 +508,7 @@ static int intel_idle_cpuidle_driver_init(void) > * allocate, initialize, register cpuidle_devices > * @cpu: cpu/core to initialize > */ > -int intel_idle_cpu_init(int cpu) > +static int intel_idle_cpu_init(int cpu) > { > int cstate; > struct cpuidle_device *dev; > @@ -539,7 +553,6 @@ int intel_idle_cpu_init(int cpu) > > return 0; > } > -EXPORT_SYMBOL_GPL(intel_idle_cpu_init); > > static int __init intel_idle_init(void) > { > @@ -581,10 +594,10 @@ static void __exit intel_idle_exit(void) > intel_idle_cpuidle_devices_uninit(); > cpuidle_unregister_driver(&intel_idle_driver); > > - if (lapic_timer_reliable_states != LAPIC_TIMER_ALWAYS_RELIABLE) { > + > + if (lapic_timer_reliable_states != LAPIC_TIMER_ALWAYS_RELIABLE) > on_each_cpu(__setup_broadcast_timer, (void *)false, 1); > - unregister_cpu_notifier(&setup_broadcast_notifier); > - } > + unregister_cpu_notifier(&cpu_hotplug_notifier); > > return; > } > diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h > index 5ab7183..66d7e0d 100644 > --- a/include/linux/cpuidle.h > +++ b/include/linux/cpuidle.h > @@ -213,14 +213,7 @@ struct cpuidle_governor { > extern int cpuidle_register_governor(struct cpuidle_governor *gov); > extern void cpuidle_unregister_governor(struct cpuidle_governor *gov); > > -#ifdef CONFIG_INTEL_IDLE > -extern int intel_idle_cpu_init(int cpu); > #else > -static inline int intel_idle_cpu_init(int cpu) { return -1; } > -#endif > - > -#else > -static inline int intel_idle_cpu_init(int cpu) { return -1; } > > static inline int cpuidle_register_governor(struct cpuidle_governor *gov) > {return 0;} > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/