From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423050AbcBZStU (ORCPT ); Fri, 26 Feb 2016 13:49:20 -0500 Received: from www.linutronix.de ([62.245.132.108]:33381 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1422861AbcBZSo4 (ORCPT ); Fri, 26 Feb 2016 13:44:56 -0500 Message-Id: <20160226182340.862113133@linutronix.de> User-Agent: quilt/0.63-1 Date: Fri, 26 Feb 2016 18:43:30 -0000 From: Thomas Gleixner To: LKML Cc: Linus Torvalds , Andrew Morton , Ingo Molnar , Peter Zijlstra , Peter Anvin , Oleg Nesterov , linux-arch@vger.kernel.org, Tejun Heo , Steven Rostedt , Rusty Russell , Paul McKenney , Rafael Wysocki , Arjan van de Ven , Rik van Riel , "Srivatsa S. Bhat" , Sebastian Siewior , Paul Turner Subject: [patch 08/20] cpu/hotplug: Hand in target state to _cpu_up/down References: <20160226164321.657646833@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Disposition: inline; filename=hotplug--Hand-in-target-state-to-_cpu_up-down.patch X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001,URIBL_BLOCKED=0.001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We want to be able to bringup/teardown the cpu to a particular state. Add a target argument to _cpu_up/down. Signed-off-by: Thomas Gleixner --- kernel/cpu.c | 31 ++++++++++++++++++++----------- 1 file changed, 20 insertions(+), 11 deletions(-) Index: b/kernel/cpu.c =================================================================== --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -547,7 +547,8 @@ static void undo_cpu_down(unsigned int c } /* Requires cpu_add_remove_lock to be held */ -static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) +static int __ref _cpu_down(unsigned int cpu, int tasks_frozen, + enum cpuhp_state target) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); int prev_state, ret = 0; @@ -564,7 +565,7 @@ static int __ref _cpu_down(unsigned int cpuhp_tasks_frozen = tasks_frozen; prev_state = st->state; - st->target = CPUHP_OFFLINE; + st->target = target; for (; st->state > st->target; st->state--) { struct cpuhp_step *step = cpuhp_bp_states + st->state; @@ -584,7 +585,7 @@ static int __ref _cpu_down(unsigned int return ret; } -int cpu_down(unsigned int cpu) +static int do_cpu_down(unsigned int cpu, enum cpuhp_state target) { int err; @@ -595,12 +596,16 @@ int cpu_down(unsigned int cpu) goto out; } - err = _cpu_down(cpu, 0); + err = _cpu_down(cpu, 0, target); out: cpu_maps_update_done(); return err; } +int cpu_down(unsigned int cpu) +{ + return do_cpu_down(cpu, CPUHP_OFFLINE); +} EXPORT_SYMBOL(cpu_down); #endif /*CONFIG_HOTPLUG_CPU*/ @@ -669,7 +674,7 @@ static void undo_cpu_up(unsigned int cpu } /* Requires cpu_add_remove_lock to be held */ -static int _cpu_up(unsigned int cpu, int tasks_frozen) +static int _cpu_up(unsigned int cpu, int tasks_frozen, enum cpuhp_state target) { struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu); struct task_struct *idle; @@ -692,7 +697,7 @@ static int _cpu_up(unsigned int cpu, int cpuhp_tasks_frozen = tasks_frozen; prev_state = st->state; - st->target = CPUHP_ONLINE; + st->target = target; while (st->state < st->target) { struct cpuhp_step *step; @@ -710,7 +715,7 @@ static int _cpu_up(unsigned int cpu, int return ret; } -int cpu_up(unsigned int cpu) +static int do_cpu_up(unsigned int cpu, enum cpuhp_state target) { int err = 0; @@ -734,12 +739,16 @@ int cpu_up(unsigned int cpu) goto out; } - err = _cpu_up(cpu, 0); - + err = _cpu_up(cpu, 0, target); out: cpu_maps_update_done(); return err; } + +int cpu_up(unsigned int cpu) +{ + return do_cpu_up(cpu, CPUHP_ONLINE); +} EXPORT_SYMBOL_GPL(cpu_up); #ifdef CONFIG_PM_SLEEP_SMP @@ -762,7 +771,7 @@ int disable_nonboot_cpus(void) if (cpu == first_cpu) continue; trace_suspend_resume(TPS("CPU_OFF"), cpu, true); - error = _cpu_down(cpu, 1); + error = _cpu_down(cpu, 1, CPUHP_OFFLINE); trace_suspend_resume(TPS("CPU_OFF"), cpu, false); if (!error) cpumask_set_cpu(cpu, frozen_cpus); @@ -812,7 +821,7 @@ void enable_nonboot_cpus(void) for_each_cpu(cpu, frozen_cpus) { trace_suspend_resume(TPS("CPU_ON"), cpu, true); - error = _cpu_up(cpu, 1); + error = _cpu_up(cpu, 1, CPUHP_ONLINE); trace_suspend_resume(TPS("CPU_ON"), cpu, false); if (!error) { pr_info("CPU%d is up\n", cpu);