From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BAF5AC432C0 for ; Sun, 1 Dec 2019 20:09:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8403C20833 for ; Sun, 1 Dec 2019 20:09:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727169AbfLAUJh (ORCPT ); Sun, 1 Dec 2019 15:09:37 -0500 Received: from mailbackend.panix.com ([166.84.1.89]:41806 "EHLO mailbackend.panix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726173AbfLAUJh (ORCPT ); Sun, 1 Dec 2019 15:09:37 -0500 Received: from hp-x360n.lan (cpe-108-185-41-56.socal.res.rr.com [108.185.41.56]) by mailbackend.panix.com (Postfix) with ESMTPSA id 47QzqJ3Zdxz1QxS; Sun, 1 Dec 2019 15:09:32 -0500 (EST) Date: Sun, 1 Dec 2019 12:09:31 -0800 (PST) From: "Kenneth R. Crudup" Reply-To: "Kenneth R. Crudup" To: Ingo Molnar cc: Linus Torvalds , mceier@gmail.com, Davidlohr Bueso , kernel test robot , Davidlohr Bueso , Thomas Gleixner , Peter Zijlstra , Borislav Petkov , LKML , lkp@lists.01.org Subject: Re: [PATCH] x86/pat: Fix off-by-one bugs in interval tree search In-Reply-To: <20191201195521.GC3615@gmail.com> Message-ID: References: <20191127005312.GD20422@shao2-debian> <20191130212729.ykxstm5kj2p5ir6q@linux-p48b> <20191201104624.GA51279@gmail.com> <20191201144947.GA4167@gmail.com> <20191201195521.GC3615@gmail.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > uncached-minus @ 0xfed91000-0xfed92000 > > uncached-minus @ 0xff340000-0xff341000 > > write-combining @ 0x4000000000-0x4010000000 > > uncached-minus @ 0x4010000000-0x4010001000 On Sun, 1 Dec 2019, Ingo Molnar wrote: > I believe this is the region that caused the problem, the 0x4010000000 > 'end' address of the WC region is the same as the 0x4010000000 'start' > address of the UC- region that follows it. > > write-combining @ 0x604a800000-0x604b000000 > > uncached-minus @ 0x604b100000-0x604b110000 > This WC region was probably unaffected by the bug. For my education, and for completeness' sake, is there a proc/sys entry that would tell me which device/module has reserved which PAT region? -Kenny -- Kenneth R. Crudup Sr. SW Engineer, Scott County Consulting, Silicon Valley