diff options
Diffstat (limited to 'arch/x86_64/kernel')
| -rw-r--r-- | arch/x86_64/kernel/genapic.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/genapic.c b/arch/x86_64/kernel/genapic.c index d2c42fb99cb3..69b9c25a8fc4 100644 --- a/arch/x86_64/kernel/genapic.c +++ b/arch/x86_64/kernel/genapic.c @@ -20,6 +20,10 @@ #include <asm/smp.h> #include <asm/ipi.h> +#if defined(CONFIG_ACPI_BUS) +#include <acpi/acpi_bus.h> +#endif + /* which logical CPU number maps to which CPU (physical APIC ID) */ u8 x86_cpu_to_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID }; EXPORT_SYMBOL(x86_cpu_to_apicid); @@ -47,6 +51,18 @@ void __init clustered_apic_check(void) goto print; } +#if defined(CONFIG_ACPI_BUS) + /* + * Some x86_64 machines use physical APIC mode regardless of how many + * procs/clusters are present (x86_64 ES7000 is an example). + */ + if (acpi_fadt.revision > FADT2_REVISION_ID) + if (acpi_fadt.force_apic_physical_destination_mode) { + genapic = &apic_cluster; + goto print; + } +#endif + memset(cluster_cnt, 0, sizeof(cluster_cnt)); for (i = 0; i < NR_CPUS; i++) { |
