linux-kernel - Re: [RFC PATCH v2 03/35] drivers: base: Allow parts of GENERIC_CPU

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Message-ID: <20230914120014.00002866@Huawei.com>
Date:   Thu, 14 Sep 2023 12:00:14 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     James Morse <james.morse@....com>
CC:     <linux-pm@...r.kernel.org>, <loongarch@...ts.linux.dev>,
        <linux-acpi@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-riscv@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
        <x86@...nel.org>, Salil Mehta <salil.mehta@...wei.com>,
        Russell King <linux@...linux.org.uk>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        <jianyong.wu@....com>, <justin.he@....com>
Subject: Re: [RFC PATCH v2 03/35] drivers: base: Allow parts of
 GENERIC_CPU_DEVICES to be overridden

On Wed, 13 Sep 2023 16:37:51 +0000
James Morse <james.morse@....com> wrote:

> Architectures often have extra per-cpu work that needs doing
> before a CPU is registered, often to determine if a CPU is
> hotpluggable.
> 
> To allow the ACPI architectures to use GENERIC_CPU_DEVICES, move
> the cpu_register() call into arch_register_cpu(), which is made __weak
> so architectures with extra work can override it.
> This aligns with the way x86, ia64 and loongarch register hotplug CPUs
> when they become present.
> 
> Signed-off-by: James Morse <james.morse@....com>
> ---
> Changes since RFC:
>  * Dropped __init from x86/ia64 arch_register_cpu()
Confused...

> diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
> index 94a848b06f15..741863a187a6 100644
> --- a/arch/ia64/kernel/topology.c
> +++ b/arch/ia64/kernel/topology.c
> @@ -59,7 +59,7 @@ void __ref arch_unregister_cpu(int num)
>  }
>  EXPORT_SYMBOL(arch_unregister_cpu);
>  #else
> -static int __init arch_register_cpu(int num)
> +int __init arch_register_cpu(int num)

Still seems to be here...

>  {
>  	return register_cpu(&sysfs_cpus[num].cpu, num);
>  }

Even more confused because the block wasn't in the RFC at all.
Maybe dropped static?