On Tue, 21 Nov 2023 13:44:51 +0000
Russell King <rmk+ker...@armlinux.org.uk> wrote:

> From: James Morse <james.mo...@arm.com>
> To allow ACPI's _STA value to hide CPUs that are present, but not
> available to online right now due to VMM or firmware policy, the
> register_cpu() call needs to be made by the ACPI machinery when ACPI
> is in use. This allows it to hide CPUs that are unavailable from sysfs.
> Switching to GENERIC_CPU_DEVICES is an intermediate step to allow all
> five ACPI architectures to be modified at once.
> Switch over to GENERIC_CPU_DEVICES, and provide an arch_register_cpu()
> that populates the hotpluggable flag. arch_register_cpu() is also the
> interface the ACPI machinery expects.
> The struct cpu in struct cpuinfo_arm64 is never used directly, remove
> it to use the one GENERIC_CPU_DEVICES provides.
> This changes the CPUs visible in sysfs from possible to present, but
> on arm64 smp_prepare_cpus() ensures these are the same.
> 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.mo...@arm.com>
> Reviewed-by: Russell King (Oracle) <rmk+ker...@armlinux.org.uk>
> Reviewed-by: Shaoqin Huang <shahu...@redhat.com>
> Reviewed-by: Gavin Shan <gs...@redhat.com>
> Signed-off-by: Russell King (Oracle) <rmk+ker...@armlinux.org.uk>
Reviewed-by: Jonathan Cameron <jonathan.came...@huawei.com>

Reply via email to