From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
rt@linutronix.de, Thomas Gleixner <tglx@linutronix.de>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>,
Linux PM <linux-pm@vger.kernel.org>
Subject: Re: [PATCH 12/21] cpufreq: Convert to hotplug state machine
Date: Tue, 6 Sep 2016 23:27:46 +0200 [thread overview]
Message-ID: <CAJZ5v0i8o4Bnmvpmn+=8snEzfmBPxqcV9iGVSh62Wf0X86j8BA@mail.gmail.com> (raw)
In-Reply-To: <20160906170457.32393-13-bigeasy@linutronix.de>
On Tue, Sep 6, 2016 at 7:04 PM, Sebastian Andrzej Siewior
<bigeasy@linutronix.de> wrote:
> Install the callbacks via the state machine.
>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> ---
> drivers/cpufreq/cpufreq.c | 38 ++++++++++++--------------------------
> 1 file changed, 12 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 3dd4884c6f9e..e0bc632a259e 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -1358,7 +1358,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
> return add_cpu_dev_symlink(policy, cpu);
> }
>
> -static void cpufreq_offline(unsigned int cpu)
> +static int cpufreq_offline(unsigned int cpu)
> {
> struct cpufreq_policy *policy;
> int ret;
> @@ -1368,7 +1368,7 @@ static void cpufreq_offline(unsigned int cpu)
> policy = cpufreq_cpu_get_raw(cpu);
> if (!policy) {
> pr_debug("%s: No cpu_data found\n", __func__);
> - return;
> + return 0;
> }
>
> down_write(&policy->rwsem);
> @@ -1417,6 +1417,7 @@ static void cpufreq_offline(unsigned int cpu)
>
> unlock:
> up_write(&policy->rwsem);
> + return 0;
> }
>
> /**
> @@ -2332,28 +2333,6 @@ int cpufreq_update_policy(unsigned int cpu)
> }
> EXPORT_SYMBOL(cpufreq_update_policy);
>
> -static int cpufreq_cpu_callback(struct notifier_block *nfb,
> - unsigned long action, void *hcpu)
> -{
> - unsigned int cpu = (unsigned long)hcpu;
> -
> - switch (action & ~CPU_TASKS_FROZEN) {
> - case CPU_ONLINE:
> - case CPU_DOWN_FAILED:
> - cpufreq_online(cpu);
> - break;
> -
> - case CPU_DOWN_PREPARE:
> - cpufreq_offline(cpu);
> - break;
> - }
> - return NOTIFY_OK;
> -}
> -
> -static struct notifier_block __refdata cpufreq_cpu_notifier = {
> - .notifier_call = cpufreq_cpu_callback,
> -};
> -
> /*********************************************************************
> * BOOST *
> *********************************************************************/
> @@ -2455,6 +2434,7 @@ EXPORT_SYMBOL_GPL(cpufreq_boost_enabled);
> /*********************************************************************
> * REGISTER / UNREGISTER CPUFREQ DRIVER *
> *********************************************************************/
> +static enum cpuhp_state hp_online;
>
> /**
> * cpufreq_register_driver - register a CPU Frequency driver
> @@ -2517,7 +2497,13 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
> goto err_if_unreg;
> }
>
> - register_hotcpu_notifier(&cpufreq_cpu_notifier);
> + ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "cpufreq:online",
> + cpufreq_online,
> + cpufreq_offline);
> + if (ret < 0)
> + goto err_if_unreg;
> + hp_online = ret;
hp_online is enum cpuhp_state (and we pass it to
cpuhp_remove_state_nocalls(() later on), but
cpuhp_setup_state_nocalls() returns an int (and that should be 0 if it
is not an error code AFAICS), so is this actually correct?
Thanks,
Rafael
next prev parent reply other threads:[~2016-09-06 21:27 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-06 17:04 cpu hotplug: convert more drivers (batch #3) Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 01/21] arm64: FP/SIMD: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-09-06 18:14 ` Will Deacon
2016-09-19 19:51 ` [tip:smp/hotplug] arm64/FP/SIMD: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 02/21] ARM: shmobile: " Sebastian Andrzej Siewior
2016-09-06 18:05 ` Geert Uytterhoeven
2016-09-07 13:58 ` Sebastian Andrzej Siewior
2016-09-19 19:52 ` [tip:smp/hotplug] ARM/shmobile: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 03/21] ARM: OMAP: wakeupgen: " Sebastian Andrzej Siewior
2016-09-13 22:24 ` Tony Lindgren
2016-09-19 19:52 ` [tip:smp/hotplug] ARM/OMAP/wakeupgen: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 04/21] ia64: mca: " Sebastian Andrzej Siewior
2016-09-19 19:53 ` [tip:smp/hotplug] ia64/mca: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 05/21] sh: SH-X3 SMP: " Sebastian Andrzej Siewior
2016-09-19 19:53 ` [tip:smp/hotplug] sh/SH-X3 " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 06/21] x86: microcode: " Sebastian Andrzej Siewior
2016-09-07 11:36 ` Borislav Petkov
2016-09-07 14:51 ` Sebastian Andrzej Siewior
2016-09-07 16:02 ` Borislav Petkov
2016-09-07 16:45 ` [PATCH 06/21 v2] " Sebastian Andrzej Siewior
2016-09-19 19:54 ` [tip:smp/hotplug] x86/microcode: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 07/21] lib: irq_poll: " Sebastian Andrzej Siewior
2016-09-19 19:54 ` [tip:smp/hotplug] lib/irq_poll: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 08/21] block: softirq: " Sebastian Andrzej Siewior
2016-09-19 19:55 ` [tip:smp/hotplug] block/softirq: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 09/21] oprofile: timer: " Sebastian Andrzej Siewior
2016-09-19 19:55 ` [tip:smp/hotplug] oprofile/timer: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 10/21] virtio scsi: " Sebastian Andrzej Siewior
2016-09-19 19:56 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 11/21] ACPI: processor: " Sebastian Andrzej Siewior
2016-09-06 21:08 ` Rafael J. Wysocki
2016-09-07 14:01 ` Sebastian Andrzej Siewior
2016-09-07 15:59 ` Rafael J. Wysocki
2016-09-19 19:56 ` [tip:smp/hotplug] ACPI/processor: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 12/21] cpufreq: " Sebastian Andrzej Siewior
2016-09-06 21:27 ` Rafael J. Wysocki [this message]
2016-09-07 14:18 ` Sebastian Andrzej Siewior
2016-09-07 15:58 ` Rafael J. Wysocki
2016-09-19 19:56 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-09-20 14:56 ` [PATCH] cpufreq: fix up conversion " Sebastian Andrzej Siewior
2016-09-20 15:07 ` [tip:smp/hotplug] cpufreq: Fix " tip-bot for Sebastian Andrzej Siewior
2016-09-20 16:08 ` Borislav Petkov
2016-09-20 16:17 ` [PATCH] cpufreq: fix " Rafael J. Wysocki
2016-09-06 17:04 ` [PATCH 13/21] padata: Convert " Sebastian Andrzej Siewior
2016-09-19 19:57 ` [tip:smp/hotplug] " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 14/21] fault-injection: cpu: " Sebastian Andrzej Siewior
2016-09-19 19:57 ` [tip:smp/hotplug] fault-injection/cpu: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 15/21] mips: octeon: smp: " Sebastian Andrzej Siewior
2016-09-07 8:24 ` Matt Redfearn
2016-09-07 14:27 ` Sebastian Andrzej Siewior
2016-09-08 8:34 ` Matt Redfearn
2016-09-19 15:10 ` Ralf Baechle
2016-09-19 19:58 ` [tip:smp/hotplug] mips/octeon/smp: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 16/21] mips: loongson: smp: " Sebastian Andrzej Siewior
2016-09-19 15:10 ` Ralf Baechle
2016-09-19 19:58 ` [tip:smp/hotplug] mips/loongson/smp: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 17/21] s390: mm: pfault: " Sebastian Andrzej Siewior
2016-09-19 19:59 ` [tip:smp/hotplug] s390/mm/pfault: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 18/21] x86: apic: uv: " Sebastian Andrzej Siewior
2016-09-19 19:59 ` [tip:smp/hotplug] x86/apic/uv: " tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 19/21] blk: mq: reserve hotplug ID states for block Sebastian Andrzej Siewior
2016-09-19 20:03 ` [tip:smp/hotplug] blk/mq: Reserve hotplug ID states for block multiqueue tip-bot for Sebastian Andrzej Siewior
2016-09-19 21:24 ` [tip:smp/hotplug] blk/mq: Reserve hotplug " tip-bot for Sebastian Andrzej Siewior
2016-09-21 7:45 ` tip-bot for Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 20/21] blk: mq: cpu-notif: Convert to hotplug state machine Sebastian Andrzej Siewior
2016-09-06 17:04 ` [PATCH 21/21] blk: mq: " Sebastian Andrzej Siewior
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