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Message-ID: <20231130165706.000060fa@Huawei.com>
Date: Thu, 30 Nov 2023 16:57:06 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Russell King <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>,
Huacai Chen <chenhuacai@...nel.org>,
WANG Xuerui <kernel@...0n.name>
Subject: Re: [PATCH 17/21] LoongArch: Switch over to GENERIC_CPU_DEVICES
On Tue, 21 Nov 2023 13:45:17 +0000
Russell King <rmk+kernel@...linux.org.uk> wrote:
> From: James Morse <james.morse@....com>
>
> Now that GENERIC_CPU_DEVICES calls arch_register_cpu(), which can be
> overridden by the arch code, switch over to this to allow common code
> to choose when the register_cpu() call is made.
>
> This allows topology_init() to be removed.
>
> This is an intermediate step to the logic being moved to drivers/acpi,
> where GENERIC_CPU_DEVICES will do the work when booting with acpi=off.
>
> This is a subtle change. Originally:
> - on boot, topology_init() would have marked present CPUs that
> io_master() is true for as hotplug-incapable.
> - if a CPU is hotplugged that is an io_master(), it can later be
> hot-unplugged.
>
> The new behaviour is that any CPU that io_master() is true for will
> now always be marked as hotplug-incapable, thus even if it was
> hotplugged, it can no longer be hot-unplugged.
>
> This patch also has the effect of moving the registration of CPUs from
> subsys to driver core initialisation, prior to any initcalls running.
>
> Signed-off-by: James Morse <james.morse@....com>
> Reviewed-by: Gavin Shan <gshan@...hat.com>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
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