On Fri, Dec 15, 2023 at 04:50:09PM +0000, Jonathan Cameron wrote: > On Wed, 13 Dec 2023 12:50:43 +0000 > Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> wrote: > > > From: James Morse <james.morse@xxxxxxx> > > > > The kbuild robot points out that configurations without HOTPLUG_CPU > > selected can try to build acpi_processor_post_eject() without success > > as arch_unregister_cpu() is not defined. > > > > Check this explicitly. This will be merged into: > > | ACPI: Add post_eject to struct acpi_scan_handler for cpu hotplug > > for any subsequent posting. > > > > Reported-by: kbuild test robot <lkp@xxxxxxxxx> > > Signed-off-by: James Morse <james.morse@xxxxxxx> > > Tested-by: Miguel Luis <miguel.luis@xxxxxxxxxx> > > Tested-by: Vishnu Pajjuri <vishnu@xxxxxxxxxxxxxxxxxxxxxx> > > Tested-by: Jianyong Wu <jianyong.wu@xxxxxxx> > > --- > > This should probably be squashed into an earlier patch. > > Agreed. If not > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> I'm not convinced that "ACPI: Add post_eject to struct acpi_scan_handler for cpu hotplug" is the correct commit to squash this into. As far as acpi_processor.c is concerned, This commit merely renames acpi_processor_remove() to be acpi_processor_post_eject(). The function references arch_unregister_cpu() before and after this change, and its build is dependent on CONFIG_ACPI_HOTPLUG_PRESENT_CPU being defined. Commit "ACPI: convert acpi_processor_post_eject() to use IS_ENABLED()" removed the ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU surrounding acpi_processor_post_eject, and that symbol depends on CONFIG_HOTPLUG_CPU, so I think this commit is also fine. Commit "ACPI: Check _STA present bit before making CPUs not present" rewrites the function - the original body gets called acpi_processor_make_not_present() and a new acpi_processor_post_eject() is created. At this point, it doesn't reference arch_unregister_cpu(). Commit "ACPI: add support to register CPUs based on the _STA enabled bit" adds a reference to arch_unregister_cpu() in this new acpi_processor_post_eject() - so I think this is the correct commit this change should be merged into. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
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