From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756542Ab3A2O0Y (ORCPT ); Tue, 29 Jan 2013 09:26:24 -0500 Received: from goliath.siemens.de ([192.35.17.28]:24355 "EHLO goliath.siemens.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752200Ab3A2O0V (ORCPT ); Tue, 29 Jan 2013 09:26:21 -0500 Message-ID: <5107DBF3.6000802@siemens.com> Date: Tue, 29 Jan 2013 15:25:55 +0100 From: Jan Kiszka User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 MIME-Version: 1.0 To: Borislav Petkov , Andrew Morton , linux-kernel@vger.kernel.org, Jason Wessel , kgdb-bugreport@lists.sourceforge.net, Andi Kleen , Tom Tromey , Ben Widawsky , "David S. Miller" , sparclinux@vger.kernel.org Subject: Re: [PATCH v5 16/20] scripts/gdb: Add internal helper and convenience function for per-cpu lookup References: <04960fa208fbd9c0962eb4f70aa45d28aec59e8d.1359463075.git.jan.kiszka@siemens.com> <20130129135109.GF14302@pd.tnic> <5107D528.2010305@siemens.com> <20130129141202.GH14302@pd.tnic> In-Reply-To: <20130129141202.GH14302@pd.tnic> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2013-01-29 15:12, Borislav Petkov wrote: > On Tue, Jan 29, 2013 at 02:56:56PM +0100, Jan Kiszka wrote: >> Let me guess: You are dumping a weird QEMU/KVM CPU, right? > > Nah, I actually have the silicon! :-) > > Joking, of course. I wish. I'm booting the guest with -cpu phenom (it > has been like that since forever in my boot-kernel-in-kvm script) but > the host is Intel. > > If I do this on an AMD host, all is ok: > > (gdb) p $lx_per_cpu("cpu_info").x86_vendor_id > $1 = "AuthenticAMD\000\000\000" > (gdb) p $lx_per_cpu("cpu_info").x86_model_id > $2 = "AMD Phenom(tm) 9550 Quad-Core Processor", '\000' > (gdb) Remains a bug of QEMU, though possibly a minor one. > > [ … ] > >>>> +class PerCpu(gdb.Function): >>>> + __doc__ = "Return per-cpu variable.\n" \ >>>> + "\n" \ >>>> + "$lx_per_cpu(\"VAR\"[, CPU]): Return the per-cpu variable called VAR for the\n" \ >>>> + "given CPU number. If CPU is omitted, the CPU of the current context is used.\n" \ >>>> + "Note that VAR has to be quoted as string." >>> >>> >>> Ok, seriously now: >>> >>> apropos shows the "Return per-cpu... " line above. Have you found out >>> which gdb command shows the rest? help and info both say "Undefined >>> command". >> >> help function lx_... >> >> It took me a while to find this, too. > > Maybe worth documenting it then at the end of gdb-kernel-debugging.txt? > Done. Will come with v6 (if needed), otherwise as an add-on patch. Thanks, Jan -- Siemens AG, Corporate Technology, CT RTC ITP SDP-DE Corporate Competence Center Embedded Linux