The patch titled
x86_64: set cpu_index to NR_CPUS instead of 0
has been added to the -mm tree. Its filename is
x86_64-set-cpu_index-to-nr_cpus-instead-of-0.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: x86_64: set cpu_index to NR_CPUS instead of 0
From: Yinghai Lu <Yinghai.Lu@xxxxxxx>
Same BIOS will support two/four dualcore/quadcore system, and will get
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Processor #0 15:1 APIC version 16
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
Processor #1 15:1 APIC version 16
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled)
Processor #2 15:1 APIC version 16
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] enabled)
Processor #3 15:1 APIC version 16
ACPI: LAPIC (acpi_id[0x05] lapic_id[0x84] disabled)
ACPI: LAPIC (acpi_id[0x06] lapic_id[0x85] disabled)
ACPI: LAPIC (acpi_id[0x07] lapic_id[0x86] disabled)
ACPI: LAPIC (acpi_id[0x08] lapic_id[0x87] disabled)
ACPI: LAPIC (acpi_id[0x09] lapic_id[0x88] disabled)
ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x89] disabled)
ACPI: LAPIC (acpi_id[0x0b] lapic_id[0x8a] disabled)
ACPI: LAPIC (acpi_id[0x0c] lapic_id[0x8b] disabled)
ACPI: LAPIC (acpi_id[0x0d] lapic_id[0x8c] disabled)
ACPI: LAPIC (acpi_id[0x0e] lapic_id[0x8d] disabled)
ACPI: LAPIC (acpi_id[0x0f] lapic_id[0x8e] disabled)
ACPI: LAPIC (acpi_id[0x10] lapic_id[0x8f] disabled)
SMP: Allowing 16 CPUs, 12 hotplug CPUs
the /proc/cpuinfo will show as bunch of NULL cpus with cpu_index=0
so assign impossible cpu_index value at first instead of 0.
Signed-off-by: Yinghai Lu <yinghai.lu@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/smpboot_64.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff -puN arch/x86/kernel/smpboot_64.c~x86_64-set-cpu_index-to-nr_cpus-instead-of-0 arch/x86/kernel/smpboot_64.c
--- a/arch/x86/kernel/smpboot_64.c~x86_64-set-cpu_index-to-nr_cpus-instead-of-0
+++ a/arch/x86/kernel/smpboot_64.c
@@ -862,6 +862,18 @@ void __init smp_set_apicids(void)
x86_cpu_to_apicid_ptr = NULL;
}
+static void __init smp_cpu_index_default(void)
+{
+ int i;
+ struct cpuinfo_x86 *c;
+
+ for_each_cpu_mask(i, cpu_possible_map) {
+ c = &cpu_data(i);
+ /* mark all to hotplug */
+ c->cpu_index = NR_CPUS;
+ }
+}
+
/*
* Prepare for SMP bootup. The MP table or ACPI has been read
* earlier. Just do some sanity checking here and enable APIC mode.
@@ -869,6 +881,7 @@ void __init smp_set_apicids(void)
void __init smp_prepare_cpus(unsigned int max_cpus)
{
nmi_watchdog_default();
+ smp_cpu_index_default();
current_cpu_data = boot_cpu_data;
current_thread_info()->cpu = 0; /* needed? */
smp_set_apicids();
_
Patches currently in -mm which might be from Yinghai.Lu@xxxxxxx are
serial-keep-the-dtr-setting-for-serial-console.patch
git-x86.patch
x86_64-set-cpu_index-to-nr_cpus-instead-of-0.patch
kernel-printkc-concerns-about-the-console-handover.patch
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