summaryrefslogtreecommitdiffstats
path: root/arch/i386
diff options
context:
space:
mode:
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/kernel/acpi/boot.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index f21fa0d4482..79577f0ace9 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -248,10 +248,17 @@ acpi_parse_lapic(acpi_table_entry_header * header, const unsigned long end)
acpi_table_print_madt_entry(header);
- /* Register even disabled CPUs for cpu hotplug */
-
- x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
+ /* Record local apic id only when enabled */
+ if (processor->flags.enabled)
+ x86_acpiid_to_apicid[processor->acpi_id] = processor->id;
+ /*
+ * We need to register disabled CPU as well to permit
+ * counting disabled CPUs. This allows us to size
+ * cpus_possible_map more accurately, to permit
+ * to not preallocating memory for all NR_CPUS
+ * when we use CPU hotplug.
+ */
mp_register_lapic(processor->id, /* APIC ID */
processor->flags.enabled); /* Enabled? */