linux-kernel - Re: [PATCH] driver core: cpu: don't hand-override the uevent bus

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Date:   Mon, 13 Feb 2023 17:08:17 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH] driver core: cpu: don't hand-override the uevent bus_type callback.

On Fri, Feb 10, 2023 at 11:24 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> Instead of having to change the uevent bus_type callback by hand at
> runtime, set it at build time based on the build configuration options,
> making this much simpler to maintain and understand (and allow to make
> the structure constant.)
>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>

LGTM:

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/base/cpu.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 8bb623039bb2..182c6122f815 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -125,17 +125,6 @@ static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store);
>  #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
>  #endif /* CONFIG_HOTPLUG_CPU */
>
> -struct bus_type cpu_subsys = {
> -       .name = "cpu",
> -       .dev_name = "cpu",
> -       .match = cpu_subsys_match,
> -#ifdef CONFIG_HOTPLUG_CPU
> -       .online = cpu_subsys_online,
> -       .offline = cpu_subsys_offline,
> -#endif
> -};
> -EXPORT_SYMBOL_GPL(cpu_subsys);
> -
>  #ifdef CONFIG_KEXEC
>  #include <linux/kexec.h>
>
> @@ -348,6 +337,20 @@ static int cpu_uevent(const struct device *dev, struct kobj_uevent_env *env)
>  }
>  #endif
>
> +struct bus_type cpu_subsys = {
> +       .name = "cpu",
> +       .dev_name = "cpu",
> +       .match = cpu_subsys_match,
> +#ifdef CONFIG_HOTPLUG_CPU
> +       .online = cpu_subsys_online,
> +       .offline = cpu_subsys_offline,
> +#endif
> +#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
> +       .uevent = cpu_uevent,
> +#endif
> +};
> +EXPORT_SYMBOL_GPL(cpu_subsys);
> +
>  /*
>   * register_cpu - Setup a sysfs device for a CPU.
>   * @cpu - cpu->hotpluggable field set to 1 will generate a control file in
> @@ -368,9 +371,6 @@ int register_cpu(struct cpu *cpu, int num)
>         cpu->dev.offline_disabled = !cpu->hotpluggable;
>         cpu->dev.offline = !cpu_online(num);
>         cpu->dev.of_node = of_get_cpu_node(num, NULL);
> -#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
> -       cpu->dev.bus->uevent = cpu_uevent;
> -#endif
>         cpu->dev.groups = common_cpu_attr_groups;
>         if (cpu->hotpluggable)
>                 cpu->dev.groups = hotplugable_cpu_attr_groups;
> --
> 2.39.1
>