x86, cacheinfo: Make use of CPUID 0x8000001d for cache information on AMD

Rely on CPUID 0x8000001d for cache information when AMD CPUID topology
extensions are available.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Link: http://lkml.kernel.org/r/20121019090049.GF26718@alberichSigned-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/kernel/cpu/intel_cacheinfo.c

@@ -538,6 +538,10 @@ __cpuinit cpuid4_cache_lookup_regs(int index,
 	unsigned		edx;
 
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
+		if (cpu_has_topoext)
+			cpuid_count(0x8000001d, index, &eax.full,
+				    &ebx.full, &ecx.full, &edx);
+		else
 			amd_cpuid4(index, &eax, &ebx, &ecx);
 		amd_init_l3_cache(this_leaf, index);
 	} else {