linux-kernel - Re: [PATCH RFC 17/22] x86/topology: convert to use arch_cpu_is

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Message-ID: <20231128151827.0000689e@Huawei.com>
Date:   Tue, 28 Nov 2023 15:18:27 +0000
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
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>, <linux-csky@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-ia64@...r.kernel.org>,
        <linux-parisc@...r.kernel.org>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        <jianyong.wu@....com>, <justin.he@....com>,
        James Morse <james.morse@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH RFC 17/22] x86/topology: convert to use
 arch_cpu_is_hotpluggable()

On Tue, 07 Nov 2023 10:30:45 +0000
"Russell King (Oracle)" <rmk+kernel@...linux.org.uk> wrote:

> Convert x86 to use the arch_cpu_is_hotpluggable() helper rather than
> arch_register_cpu().
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

As with earlier set of related changes, could squash this down to avoid
churn and use Co-developed or similar. Up to you though.

Maybe a forwards reference to this being a later change in the patch 15
description might be good though!
> ---
>  arch/x86/kernel/topology.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/kernel/topology.c b/arch/x86/kernel/topology.c
> index 211863cb5b81..d42c28b8bfd8 100644
> --- a/arch/x86/kernel/topology.c
> +++ b/arch/x86/kernel/topology.c
> @@ -36,11 +36,8 @@
>  #include <asm/cpu.h>
>  
>  #ifdef CONFIG_HOTPLUG_CPU
> -int arch_register_cpu(int cpu)
> +bool arch_cpu_is_hotpluggable(int cpu)
>  {
> -	struct cpu *c = per_cpu_ptr(&cpu_devices, cpu);
> -
> -	c->hotpluggable = cpu > 0;
> -	return register_cpu(c, cpu);
> +	return cpu > 0;
>  }
>  #endif /* CONFIG_HOTPLUG_CPU */