On Tue, 28 Nov 2023 15:08:54 +0000 Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> wrote: > On Tue, 07 Nov 2023 10:30:25 +0000 > Russell King <rmk+kernel@xxxxxxxxxxxxxxx> wrote: > > > From: James Morse <james.morse@xxxxxxx> > > > > 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.morse@xxxxxxx> > > Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> > > Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> > > Given this series adds an arch_cpu_is_hotpluggable() callback we probably > want something in this patch description to say why this > isn't using that, but instead overriding arch_register_cpu() > As per comment on next patch I'm fine with this slight dance. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
