From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752665AbbCQI1q (ORCPT ); Tue, 17 Mar 2015 04:27:46 -0400 Received: from mail-we0-f170.google.com ([74.125.82.170]:35500 "EHLO mail-we0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751895AbbCQI1n (ORCPT ); Tue, 17 Mar 2015 04:27:43 -0400 Date: Tue, 17 Mar 2015 09:27:36 +0100 From: Ingo Molnar To: Borislav Petkov Cc: Denys Vlasenko , linux-tip-commits@vger.kernel.org, linux-kernel@vger.kernel.org, keescook@chromium.org, ast@plumgrid.com, fweisbec@gmail.com, oleg@redhat.com, tglx@linutronix.de, torvalds@linux-foundation.org, hpa@zytor.com, wad@chromium.org, rostedt@goodmis.org Subject: Re: [tip:x86/asm] x86/asm/entry/64: Remove unused thread_struct::usersp Message-ID: <20150317082736.GA28720@gmail.com> References: <1425984307-2143-2-git-send-email-dvlasenk@redhat.com> <20150316164707.GB23015@pd.tnic> <55075736.7030003@redhat.com> <20150317070830.GA19645@pd.tnic> <20150317071316.GA22758@gmail.com> <20150317072118.GA26864@gmail.com> <20150317075139.GA27898@gmail.com> <20150317080658.GD19645@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150317080658.GD19645@pd.tnic> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Borislav Petkov wrote: > On Tue, Mar 17, 2015 at 08:51:39AM +0100, Ingo Molnar wrote: > > can you confirm that your guest (sometimes) uses SYSENTER to do > > syscalls? > > I don't think so - in both dumps of libc.so and ld.so, we have > > SYSCALL... RET -> Ok, in any case I'm doing a rebase of the affected commits in tip:x86/asm. That's a tree where we don't want to break bisectability, and this breakage looks sufficiently mysterious. Thanks, Ingo