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    SubjectRe: [PATCH v7 05/16] ACPI: processor: Add acpi_get_processor_handle() helper
    On Thu, Apr 18, 2024 at 3:56 PM Jonathan Cameron
    <Jonathan.Cameron@huawei.com> wrote:
    >
    > If CONFIG_ACPI_PROCESSOR provide a helper to retrieve the
    > acpi_handle for a given CPU allowing access to methods
    > in DSDT.
    >
    > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
    > ---
    > v7: No change
    > v6: New patch
    > ---
    > drivers/acpi/acpi_processor.c | 10 ++++++++++
    > include/linux/acpi.h | 7 +++++++
    > 2 files changed, 17 insertions(+)
    >
    > diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
    > index ac7ddb30f10e..127ae8dcb787 100644
    > --- a/drivers/acpi/acpi_processor.c
    > +++ b/drivers/acpi/acpi_processor.c
    > @@ -35,6 +35,16 @@ EXPORT_PER_CPU_SYMBOL(processors);
    > struct acpi_processor_errata errata __read_mostly;
    > EXPORT_SYMBOL_GPL(errata);
    >
    > +acpi_handle acpi_get_processor_handle(int cpu)
    > +{
    > + acpi_handle handle = NULL;

    The local var looks redundant.

    > + struct acpi_processor *pr = per_cpu(processors, cpu);;
    > +
    > + if (pr)
    > + handle = pr->handle;
    > +
    > + return handle;

    struct acpi_processor *pr;

    pr = per_cpu(processors, cpu);
    if (pr)
    return pr->handle;

    return NULL;


    > +}
    > static int acpi_processor_errata_piix4(struct pci_dev *dev)
    > {
    > u8 value1 = 0;
    > diff --git a/include/linux/acpi.h b/include/linux/acpi.h
    > index 34829f2c517a..9844a3f9c4e5 100644
    > --- a/include/linux/acpi.h
    > +++ b/include/linux/acpi.h
    > @@ -309,6 +309,8 @@ int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
    > int acpi_unmap_cpu(int cpu);
    > #endif /* CONFIG_ACPI_HOTPLUG_CPU */
    >
    > +acpi_handle acpi_get_processor_handle(int cpu);
    > +
    > #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
    > int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr);
    > #endif
    > @@ -1077,6 +1079,11 @@ static inline bool acpi_sleep_state_supported(u8 sleep_state)
    > return false;
    > }
    >
    > +static inline acpi_handle acpi_get_processor_handle(int cpu)
    > +{
    > + return NULL;
    > +}
    > +
    > #endif /* !CONFIG_ACPI */
    >
    > extern void arch_post_acpi_subsys_init(void);
    > --

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