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| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2008-08-23 17:47:10 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-08-23 17:47:10 +0200 |
| commit | bbb65d2d365efe9951290e61678dcf81ec60add4 (patch) | |
| tree | f3eacf1b1313d729e084064ed6dda5db64522bf4 /arch/x86/kernel/cpu/intel_64.c | |
| parent | 87ce786ae5f24e336195805a9fc7428a6f922478 (diff) | |
| download | op-kernel-dev-bbb65d2d365efe9951290e61678dcf81ec60add4.zip op-kernel-dev-bbb65d2d365efe9951290e61678dcf81ec60add4.tar.gz | |
x86: use cpuid vector 0xb when available for detecting cpu topology
cpuid leaf 0xb provides extended topology enumeration. This interface provides
the 32-bit x2APIC id of the logical processor and it also provides a new
mechanism to detect SMT and core siblings (which provides increased
addressability).
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/intel_64.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel_64.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/intel_64.c b/arch/x86/kernel/cpu/intel_64.c index 1019c58..42d501a 100644 --- a/arch/x86/kernel/cpu/intel_64.c +++ b/arch/x86/kernel/cpu/intel_64.c @@ -80,7 +80,10 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c) if (c->x86 == 6) set_cpu_cap(c, X86_FEATURE_REP_GOOD); set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC); - c->x86_max_cores = intel_num_cpu_cores(c); + + detect_extended_topology(c); + if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) + c->x86_max_cores = intel_num_cpu_cores(c); srat_detect_node(); } |
