linux-kernel - Re: [PATCH RFC 07/22] drivers: base: Allow parts of GENERIC_CPU

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Message-ID: <a51eab2e-5d23-420a-a46e-aad79af1ad50@redhat.com>
Date:   Mon, 13 Nov 2023 10:42:46 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        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, linux-csky@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-parisc@...r.kernel.org
Cc:     Salil Mehta <salil.mehta@...wei.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        jianyong.wu@....com, justin.he@....com,
        James Morse <james.morse@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH RFC 07/22] drivers: base: Allow parts of
 GENERIC_CPU_DEVICES to be overridden

On 11/7/23 20:29, Russell King (Oracle) wrote:
> From: James Morse <james.morse@....com>
> 
> 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>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> ---
> Changes since RFC:
>   * Dropped __init from x86/ia64 arch_register_cpu()
> Changes since RFC v2:
>   * Dropped unnecessary Loongarch asm/cpu.h changes
> ---
>   drivers/base/cpu.c  | 14 ++++++++++----
>   include/linux/cpu.h |  4 ++++
>   2 files changed, 14 insertions(+), 4 deletions(-)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>