The NodeId field in cpuid_ecx(0x8000001e) is a 8 bit field. Although current extractor works fine, it will break if/when the most significant 5 bits ever get used.
So, lets honor the field as architected in the BKDG Reference: BKDG for AMD Fam15h Models 00h-0fh, CPUID Fn8000_001E_ECX Node Identifiers Signed-off-by: Aravind Gopalakrishnan <aravind.gopalakrish...@amd.com> --- arch/x86/kernel/cpu/amd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index a220239..9942b83 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -300,7 +300,7 @@ static void amd_get_topology(struct cpuinfo_x86 *c) cpuid(0x8000001e, &eax, &ebx, &ecx, &edx); nodes = ((ecx >> 8) & 7) + 1; - node_id = ecx & 7; + node_id = ecx & 0xff; /* get compute unit information */ smp_num_siblings = ((ebx >> 8) & 3) + 1; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/