On Wednesday, July 02, 2014 04:47:24 PM Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
>
> Now ARM64 support is being added to ACPI so architecture specific
> values can not be used in core ACPI code.
>
> Following on the patch "ACPI / processor: Check if LAPIC is present
> during initialization" which uses acpi_lapic in acpi_processor.c,
> on ARM64 platform, GIC is used instead of local APIC, so acpi_lapic
> is not a suitable value for ARM64.
>
> What is actually important at this point is the SMPness of the system,
> so introduce acpi_arch_is_smp() to be arch specific and generic.
>
> Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
> Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> ---
> arch/ia64/include/asm/acpi.h | 5 +++++
> arch/x86/include/asm/acpi.h | 5 +++++
> drivers/acpi/acpi_processor.c | 2 +-
> 3 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
> index 75dc59a..2fc0757 100644
> --- a/arch/ia64/include/asm/acpi.h
> +++ b/arch/ia64/include/asm/acpi.h
> @@ -40,6 +40,11 @@ extern int acpi_lapic;
> #define acpi_noirq 0 /* ACPI always enabled on IA64 */
> #define acpi_pci_disabled 0 /* ACPI PCI always enabled on IA64 */
> #define acpi_strict 1 /* no ACPI spec workarounds on IA64 */
> +
> +static inline bool acpi_arch_is_smp(void)
Why this name? In particular, local APIC being present doesn't imply SMP.
> +{
> + return acpi_lapic;
Also
return !!acpi_lapic;
would be cleaner IMO.
> +}
> #endif
> #define acpi_processor_cstate_check(x) (x) /* no idle limits on IA64 :) */
> static inline void disable_acpi(void) { }
> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
> index e06225e..939d377 100644
> --- a/arch/x86/include/asm/acpi.h
> +++ b/arch/x86/include/asm/acpi.h
> @@ -121,6 +121,11 @@ static inline void arch_acpi_set_pdc_bits(u32 *buf)
> buf[2] &= ~(ACPI_PDC_C_C2C3_FFH);
> }
>
> +static inline bool acpi_arch_is_smp(void)
> +{
> + return acpi_lapic;
> +}
> +
> #else /* !CONFIG_ACPI */
>
> #define acpi_lapic 0
> diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
> index 1c08574..8622a0e 100644
> --- a/drivers/acpi/acpi_processor.c
> +++ b/drivers/acpi/acpi_processor.c
> @@ -268,7 +268,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
> pr->apic_id = apic_id;
>
> cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
> - if (!cpu0_initialized && !acpi_lapic) {
> + if (!cpu0_initialized && !acpi_arch_is_smp()) {
> cpu0_initialized = 1;
> /* Handle UP system running SMP kernel, with no LAPIC in MADT */
> if ((cpu_index == -1) && (num_online_cpus() == 1))
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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