On Wed, 13 Dec 2023 12:49:47 +0000 Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> wrote: > From: James Morse <james.morse@xxxxxxx> > > acpi_processor_hotadd_init() will make a CPU present by mapping it > based on its hardware id. > > 'hotadd_init' is ambiguous once there are two different behaviours > for cpu hotplug. This is for toggling the _STA present bit. Subsequent > patches will add support for toggling the _STA enabled bit, named > acpi_processor_make_enabled(). > > Rename it acpi_processor_make_present() to make it clear this is > for CPUs that were not previously present. > > Expose the function prototypes it uses to allow the preprocessor > guards to be removed. The IS_ENABLED() check will let the compiler > dead-code elimination pass remove this if it isn't going to be > used. > > 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> > --- > Outstanding comments: > https://lore.kernel.org/r/20230914151720.00007105@xxxxxxxxxx If it's not caused a build warning yet, chances are high this is fine. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > https://lore.kernel.org/r/b8f430c1-c30f-191f-18c6-f750fa6ba476@xxxxxxxxxx > For this comment, we use IS_ENABLED() in multiple places in the kernel in > this way, and it isn't a problem. > --- > drivers/acpi/acpi_processor.c | 14 +++++--------- > include/linux/acpi.h | 2 -- > 2 files changed, 5 insertions(+), 11 deletions(-) > > diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c > index c8e960ff0aca..26e3efb74614 100644 > --- a/drivers/acpi/acpi_processor.c > +++ b/drivers/acpi/acpi_processor.c > @@ -183,13 +183,15 @@ static void __init acpi_pcc_cpufreq_init(void) {} > #endif /* CONFIG_X86 */ > > /* Initialization */ > -#ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU > -static int acpi_processor_hotadd_init(struct acpi_processor *pr) > +static int acpi_processor_make_present(struct acpi_processor *pr) > { > unsigned long long sta; > acpi_status status; > int ret; > > + if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_PRESENT_CPU)) > + return -ENODEV; > + > if (invalid_phys_cpuid(pr->phys_id)) > return -ENODEV; > > @@ -223,12 +225,6 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr) > cpu_maps_update_done(); > return ret; > } > -#else > -static inline int acpi_processor_hotadd_init(struct acpi_processor *pr) > -{ > - return -ENODEV; > -} > -#endif /* CONFIG_ACPI_HOTPLUG_PRESENT_CPU */ > > static int acpi_processor_get_info(struct acpi_device *device) > { > @@ -335,7 +331,7 @@ static int acpi_processor_get_info(struct acpi_device *device) > * because cpuid <-> apicid mapping is persistent now. > */ > if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { > - int ret = acpi_processor_hotadd_init(pr); > + int ret = acpi_processor_make_present(pr); > > if (ret) > return ret; > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 36071bc11acd..19d009ca9e7a 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -301,12 +301,10 @@ static inline int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu, > } > #endif > > -#ifdef CONFIG_ACPI_HOTPLUG_PRESENT_CPU > /* Arch dependent functions for cpu hotplug support */ > int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id, > int *pcpu); > int acpi_unmap_cpu(int cpu); > -#endif /* CONFIG_ACPI_HOTPLUG_PRESENT_CPU */ > > #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC > int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
