diff options
| author | Yinghai Lu <Yinghai.Lu@Sun.COM> | 2008-02-23 21:48:42 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 17:40:49 +0200 |
| commit | 322850af8d93735f67b8ebf84bb1350639be3f34 (patch) | |
| tree | 107a13e6d486d6d5f0791630c8701b100d9cfb92 /arch | |
| parent | 513ad84bf60d96a6998bca10ed07c3d340449be8 (diff) | |
x86: make amd quad core 8 socket system not be clustered_box, #2
quad core 8 socket system will have apic id lifting.the apic id range could
be [4, 0x23]. and apic_is_clustered_box will think that need to three clusters
and that is large than 2. So it is treated as clustered_box.
and will get
Marking TSC unstable due to TSCs unsynchronized
even the CPUs have X86_FEATURE_CONSTANT_TSC set.
this patch will check if the cpu is from AMD.
Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/apic_64.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c index d8d03e09dea2..7d8ffdaa0ab3 100644 --- a/arch/x86/kernel/apic_64.c +++ b/arch/x86/kernel/apic_64.c @@ -1180,9 +1180,19 @@ __cpuinit int apic_is_clustered_box(void) { int i, clusters, zeros; unsigned id; - u16 *bios_cpu_apicid = x86_bios_cpu_apicid_early_ptr; + u16 *bios_cpu_apicid; DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); + /* + * there is not this kind of box with AMD CPU yet. + * Some AMD box with quadcore cpu and 8 sockets apicid + * will be [4, 0x23] or [8, 0x27] could be thought to + * have three apic_clusters. So go out early. + */ + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) + return 0; + + bios_cpu_apicid = x86_bios_cpu_apicid_early_ptr; bitmap_zero(clustermap, NUM_APIC_CLUSTERS); for (i = 0; i < NR_CPUS; i++) { |