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SubjectRe: [tip:smp/hotplug] hwmon/coretemp: Convert to hotplug state machine
Just be aware that this patch is buggy.

Guenter

On Mon, Nov 21, 2016 at 07:56:02AM -0800, tip-bot for Sebastian Andrzej Siewior wrote:
> Commit-ID: 73f4f6f5ab9a069037b8e98663193accaf18bd5c
> Gitweb: http://git.kernel.org/tip/73f4f6f5ab9a069037b8e98663193accaf18bd5c
> Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> AuthorDate: Thu, 17 Nov 2016 19:35:25 +0100
> Committer: Thomas Gleixner <tglx@linutronix.de>
> CommitDate: Mon, 21 Nov 2016 16:37:10 +0100
>
> hwmon/coretemp: Convert to hotplug state machine
>
> Install the callbacks via the state machine. Setup and teardown are handled
> by the hotplug core.
>
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Cc: linux-hwmon@vger.kernel.org
> Cc: Fenghua Yu <fenghua.yu@intel.com>
> Cc: Jean Delvare <jdelvare@suse.com>
> Cc: rt@linuxtronix.de
> Cc: Guenter Roeck <linux@roeck-us.net>
> Link: http://lkml.kernel.org/r/20161117183541.8588-5-bigeasy@linutronix.de
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
> ---
> drivers/hwmon/coretemp.c | 74 +++++++++++++++---------------------------------
> 1 file changed, 23 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index 6a27eb2..3900388 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -676,7 +676,7 @@ static bool is_any_core_online(struct platform_data *pdata)
> return false;
> }
>
> -static void get_core_online(unsigned int cpu)
> +static int coretemp_cpu_online(unsigned int cpu)
> {
> struct cpuinfo_x86 *c = &cpu_data(cpu);
> struct platform_device *pdev = coretemp_get_pdev(cpu);
> @@ -688,12 +688,12 @@ static void get_core_online(unsigned int cpu)
> * without thermal sensors will be filtered out.
> */
> if (!cpu_has(c, X86_FEATURE_DTHERM))
> - return;
> + return 0;
>
> if (!pdev) {
> /* Check the microcode version of the CPU */
> if (chk_ucode_version(cpu))
> - return;
> + return 0;
>
> /*
> * Alright, we have DTS support.
> @@ -703,7 +703,7 @@ static void get_core_online(unsigned int cpu)
> */
> err = coretemp_device_add(cpu);
> if (err)
> - return;
> + return 0;
> /*
> * Check whether pkgtemp support is available.
> * If so, add interfaces for pkgtemp.
> @@ -716,9 +716,10 @@ static void get_core_online(unsigned int cpu)
> * So, just add interfaces for this core.
> */
> coretemp_add_core(cpu, 0);
> + return 0;
> }
>
> -static void put_core_offline(unsigned int cpu)
> +static int coretemp_cpu_offline(unsigned int cpu)
> {
> int i, indx;
> struct platform_data *pdata;
> @@ -726,7 +727,7 @@ static void put_core_offline(unsigned int cpu)
>
> /* If the physical CPU device does not exist, just return */
> if (!pdev)
> - return;
> + return 0;
>
> pdata = platform_get_drvdata(pdev);
>
> @@ -734,7 +735,7 @@ static void put_core_offline(unsigned int cpu)
>
> /* The core id is too big, just return */
> if (indx > MAX_CORE_DATA - 1)
> - return;
> + return 0;
>
> if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
> coretemp_remove_core(pdata, indx);
> @@ -747,7 +748,7 @@ static void put_core_offline(unsigned int cpu)
> */
> for_each_sibling(i, cpu) {
> if (i != cpu) {
> - get_core_online(i);
> + coretemp_cpu_online(i);
> /*
> * Display temperature sensor data for one HT sibling
> * per core only, so abort the loop after one such
> @@ -764,38 +765,20 @@ static void put_core_offline(unsigned int cpu)
> */
> if (!is_any_core_online(pdata))
> coretemp_device_remove(cpu);
> + return 0;
> }
>
> -static int coretemp_cpu_callback(struct notifier_block *nfb,
> - unsigned long action, void *hcpu)
> -{
> - unsigned int cpu = (unsigned long) hcpu;
> -
> - switch (action) {
> - case CPU_ONLINE:
> - case CPU_DOWN_FAILED:
> - get_core_online(cpu);
> - break;
> - case CPU_DOWN_PREPARE:
> - put_core_offline(cpu);
> - break;
> - }
> - return NOTIFY_OK;
> -}
> -
> -static struct notifier_block coretemp_cpu_notifier __refdata = {
> - .notifier_call = coretemp_cpu_callback,
> -};
> -
> static const struct x86_cpu_id __initconst coretemp_ids[] = {
> { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM },
> {}
> };
> MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
>
> +static enum cpuhp_state coretemp_hp_online;
> +
> static int __init coretemp_init(void)
> {
> - int i, err;
> + int err;
>
> /*
> * CPUID.06H.EAX[0] indicates whether the CPU has thermal
> @@ -809,44 +792,33 @@ static int __init coretemp_init(void)
> if (err)
> goto exit;
>
> - cpu_notifier_register_begin();
> - for_each_online_cpu(i)
> - get_core_online(i);
> + err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/coretemp:online",
> + coretemp_cpu_online, coretemp_cpu_offline);
> + if (err < 0)
> + goto exit_driver_unreg;
> + coretemp_hp_online = err;
>
> #ifndef CONFIG_HOTPLUG_CPU
> if (list_empty(&pdev_list)) {
> - cpu_notifier_register_done();
> err = -ENODEV;
> - goto exit_driver_unreg;
> + goto exit_hp_unreg;
> }
> #endif
> -
> - __register_hotcpu_notifier(&coretemp_cpu_notifier);
> - cpu_notifier_register_done();
> return 0;
>
> #ifndef CONFIG_HOTPLUG_CPU
> +exit_hp_unreg:
> + cpuhp_remove_state(coretemp_hp_online);
> +#endif
> exit_driver_unreg:
> platform_driver_unregister(&coretemp_driver);
> -#endif
> exit:
> return err;
> }
>
> static void __exit coretemp_exit(void)
> {
> - struct pdev_entry *p, *n;
> -
> - cpu_notifier_register_begin();
> - __unregister_hotcpu_notifier(&coretemp_cpu_notifier);
> - mutex_lock(&pdev_list_mutex);
> - list_for_each_entry_safe(p, n, &pdev_list, list) {
> - platform_device_unregister(p->pdev);
> - list_del(&p->list);
> - kfree(p);
> - }
> - mutex_unlock(&pdev_list_mutex);
> - cpu_notifier_register_done();
> + cpuhp_remove_state(coretemp_hp_online);
> platform_driver_unregister(&coretemp_driver);
> }
>

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