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| author | Clark Williams <williams@redhat.com> | 2012-01-25 21:31:16 -0600 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-01-25 21:31:16 -0600 |
| commit | 974f4b86951972b133b4ec5b36956b979dea08d0 (patch) | |
| tree | 090b441b1c96f708e8a033c7f88fa383dd1e7cba /drivers/acpi/processor_core.c | |
| parent | 40a54e2e116950a27dbd0a46a7b1ff8e982de477 (diff) | |
| parent | 3499d6424f682a58761d827012567c552b053842 (diff) | |
Merge commit 'v3.2.2' into rt-3.2.2-rt10
Diffstat (limited to 'drivers/acpi/processor_core.c')
| -rw-r--r-- | drivers/acpi/processor_core.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 3a0428e8435c..c850de4c9a14 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -173,8 +173,30 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) apic_id = map_mat_entry(handle, type, acpi_id); if (apic_id == -1) apic_id = map_madt_entry(type, acpi_id); - if (apic_id == -1) - return apic_id; + if (apic_id == -1) { + /* + * On UP processor, there is no _MAT or MADT table. + * So above apic_id is always set to -1. + * + * BIOS may define multiple CPU handles even for UP processor. + * For example, + * + * Scope (_PR) + * { + * Processor (CPU0, 0x00, 0x00000410, 0x06) {} + * Processor (CPU1, 0x01, 0x00000410, 0x06) {} + * Processor (CPU2, 0x02, 0x00000410, 0x06) {} + * Processor (CPU3, 0x03, 0x00000410, 0x06) {} + * } + * + * Ignores apic_id and always return 0 for CPU0's handle. + * Return -1 for other CPU's handle. + */ + if (acpi_id == 0) + return acpi_id; + else + return apic_id; + } #ifdef CONFIG_SMP for_each_possible_cpu(i) { |