Andi Kleen <a...@firstfloor.org> writes: > Alexander Shishkin <alexander.shish...@linux.intel.com> writes: >> + return sprintf(page, "%lu\n", val); >> + case 1: >> + cpuid(0x15, &eax, &ebx, &ecx, &edx); > > Surely this needs to be protected by a cpuid level check? > Broadwell for once doesn't have CPUID 0x15.
I couldn't find where this is explicitly said in the SDM. However, the leaf description says that CPUID.0x15.EBX[31:0]==0 means that the ratio is not enumerated. I don't see how to better communicate this to userspace though than to simply have 0 there. Regards, -- Alex -- 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/
