From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1428209AbdDXQ6J (ORCPT ); Mon, 24 Apr 2017 12:58:09 -0400 Received: from mail-wm0-f67.google.com ([74.125.82.67]:35796 "EHLO mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S975201AbdDXQ6B (ORCPT ); Mon, 24 Apr 2017 12:58:01 -0400 Date: Mon, 24 Apr 2017 19:57:57 +0300 From: "Kirill A. Shutemov" To: Dan Williams Cc: dvlasenk@redhat.com, Ingo Molnar , luto@kernel.org, Andrew Morton , brgerst@gmail.com, Arnd Bergmann , jpoimboe@redhat.com, mhocko@suse.com, "H. Peter Anvin" , dave.hansen@intel.com, Peter Zijlstra , "Kirill A. Shutemov" , Thomas Gleixner , Linus Torvalds , Andy Lutomirski , Borislav Petkov , Linux Kernel Mailing List , linux-tip-commits@vger.kernel.org Subject: Re: [tip:x86/mm] x86: Convert the rest of the code to support p4d_t Message-ID: <20170424165757.76g6qdm4yf4a5ggx@node.shutemov.name> References: <20170317185515.8636-7-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20170306 (1.8.0) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Apr 23, 2017 at 12:56:14PM -0700, Dan Williams wrote: > On Mon, Mar 27, 2017 at 3:25 AM, tip-bot for Kirill A. Shutemov > wrote: > > Commit-ID: f2a6a7050109e0a5c7a84c70aa6010f682b2f1ee > > Gitweb: http://git.kernel.org/tip/f2a6a7050109e0a5c7a84c70aa6010f682b2f1ee > > Author: Kirill A. Shutemov > > AuthorDate: Fri, 17 Mar 2017 21:55:15 +0300 > > Committer: Ingo Molnar > > CommitDate: Mon, 27 Mar 2017 08:56:58 +0200 > > > > x86: Convert the rest of the code to support p4d_t > > > > This patch converts x86 to use proper folding of a new (fifth) page table level > > with . > > > > That's a bit of a kitchen sink patch, but I don't see how to split it further > > without hurting bisectability. > > > > Signed-off-by: Kirill A. Shutemov > > Acked-by: Thomas Gleixner > > Cc: Andrew Morton > > Cc: Andy Lutomirski > > Cc: Andy Lutomirski > > Cc: Arnd Bergmann > > Cc: Borislav Petkov > > Cc: Brian Gerst > > Cc: Dave Hansen > > Cc: Denys Vlasenko > > Cc: H. Peter Anvin > > Cc: Josh Poimboeuf > > Cc: Linus Torvalds > > Cc: Michal Hocko > > Cc: Peter Zijlstra > > Cc: linux-arch@vger.kernel.org > > Cc: linux-mm@kvack.org > > Link: http://lkml.kernel.org/r/20170317185515.8636-7-kirill.shutemov@linux.intel.com > > Signed-off-by: Ingo Molnar > > Following Ingo's revert of commit 2947ba054a4d "x86/mm/gup: Switch GUP > to the generic get_user_page_fast() implementation", I gave > tip.git/master a try to see if it resolved the original failing > signature I was seeing with the "device-dax" regression test [1] on > next/master. It turns out that there are two failing signatures and I > need to use the revert during the bisect to find this other > regression. This new bisect points to commit f2a6a7050109 "x86: > Convert the rest of the code to support p4d_t" as the culprit. > > [ 43.194330] BUG: unable to handle kernel paging request at ffff880300000000 I cannot reproduce the issue. Could you share your kernel kernel config? -- Kirill A. Shutemov