On Intel AlderLake-N platforms where there are Ecores only, the Ecore Module topology is enumerated via CPUID.1F Module level, which has not been supported by Linux kernel yet. This exposes two issues in current CPUID.1F handling code. 1. Linux interprets the Module ID bits as package ID and erroneously reports a multi module system as a multi-package system. 2. Linux excludes the unknown Module ID bits from the core ID, and results in duplicate core ID’s shown in a package after the first issue solved. Plus that, a third problem is observed on Intel Hybrid ADL-S/P platforms. The return value of CPUID.1F SMT level EBX (number of siblings) differs on Pcore CPUs and Ecore CPUs, and results in inconsistent smp_num_siblings value based on the Pcore/Ecore CPU enumeration order. This could bring some potential issues although we have not observed any functionalities issues so far. This patch series fixes these three problems in CPUID.1F handling code, together with some related fixes and document updates. thanks, -rui --- Changes since V1: - fix/improve changelog/comment wording issues - reorder the patches to eliminate bisection breakage window - add a new patch for coretemp driver variable renaming - update coretemp driver patch to fix a case of ida_free(&ida, -2)
