-stable review patch. If anyone has any objections, please let us know.
------------------
Some broken BIOS's had processors disabled, but
same apic id as a valid processor. This causes
acpi_processor_start() to think this disabled
cpu is ok, and croak. So we dont record bad
apicid's anymore.
http://bugzilla.kernel.org/show_bug.cgi?id=5930
Signed-off-by: Ashok Raj <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
---
arch/i386/kernel/acpi/boot.c | 13 ++++++++++---
1 files changed, 10 insertions(+), 3 deletions(-)
Index: linux-2.6.15.3/arch/i386/kernel/acpi/boot.c
===================================================================
--- linux-2.6.15.3.orig/arch/i386/kernel/acpi/boot.c
+++ linux-2.6.15.3/arch/i386/kernel/acpi/boot.c
@@ -248,10 +248,17 @@ acpi_parse_lapic(acpi_table_entry_header
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? */
--
-
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