Re: [PATCH RFC 07/22] drivers: base: Allow parts of GENERIC_CPU_DEVICES to be overridden
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- To: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
- Subject: Re: [PATCH RFC 07/22] drivers: base: Allow parts of GENERIC_CPU_DEVICES to be overridden
- From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
- Date: Tue, 28 Nov 2023 14:49:21 +0000
- Cc: <linux-pm@xxxxxxxxxxxxxxx>, <loongarch@xxxxxxxxxxxxxxx>, <linux-acpi@xxxxxxxxxxxxxxx>, <linux-arch@xxxxxxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, <linux-riscv@xxxxxxxxxxxxxxxxxxx>, <kvmarm@xxxxxxxxxxxxxxx>, <x86@xxxxxxxxxx>, <linux-csky@xxxxxxxxxxxxxxx>, <linux-doc@xxxxxxxxxxxxxxx>, <linux-ia64@xxxxxxxxxxxxxxx>, <linux-parisc@xxxxxxxxxxxxxxx>, Salil Mehta <salil.mehta@xxxxxxxxxx>, Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>, <jianyong.wu@xxxxxxx>, <justin.he@xxxxxxx>, James Morse <james.morse@xxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- In-reply-to: <E1r0JLG-00CTx8-CG@rmk-PC.armlinux.org.uk>
- Organization: Huawei Technologies Research and Development (UK) Ltd.
- References: <ZUoRY33AAHMc5ThW@shell.armlinux.org.uk> <E1r0JLG-00CTx8-CG@rmk-PC.armlinux.org.uk>
On Tue, 07 Nov 2023 10:29:54 +0000
Russell King <rmk+kernel@xxxxxxxxxxxxxxx> wrote:
> From: James Morse <james.morse@xxxxxxx>
>
> 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@xxxxxxx>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
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