From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+w=401wt.eu-S1758001AbZA2SEX@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1758001AbZA2SEX (ORCPT <rfc822;w@1wt.eu>);
	Thu, 29 Jan 2009 13:04:23 -0500
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752653AbZA2SEO
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Thu, 29 Jan 2009 13:04:14 -0500
Received: from smtp1.linux-foundation.org ([140.211.169.13]:59527 "EHLO
	smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK)
	by vger.kernel.org with ESMTP id S1753574AbZA2SEN (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Thu, 29 Jan 2009 13:04:13 -0500
Date: Thu, 29 Jan 2009 10:01:57 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Neil Horman <nhorman@tuxdriver.com>
Cc: Simon Horman <horms@verge.net.au>, Randy Dunlap <randy.dunlap@oracle.com>,
       linux-kernel@vger.kernel.org, Miao Xie <miaox@cn.fujitsu.com>,
       Vivek Goyal <vgoyal@redhat.com>
Subject: Re: mmotm 2009-01-28-02-17 uploaded (i386 build errors: cpusets &
 kexec)
Message-Id: <20090129100157.965bd396.akpm@linux-foundation.org>
In-Reply-To: <20090129120935.GB9221@hmsreliant.think-freely.org>
References: <200901281019.n0SAJ9C6013727@imap1.linux-foundation.org>
	<49808E3F.1090805@oracle.com>
	<20090128163040.88b05b3d.akpm@linux-foundation.org>
	<20090129022846.GA1319@verge.net.au>
	<20090129120935.GB9221@hmsreliant.think-freely.org>
X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.5; x86_64-redhat-linux-gnu)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, 29 Jan 2009 07:09:35 -0500 Neil Horman <nhorman@tuxdriver.com> wrote:

> > > So does that.
> > > 
> > > --- a/kernel/printk.c~kexec-add-dmesg-log-symbols-to-proc-vmcoreinfo-lists-fix-fix
> > > +++ a/kernel/printk.c
> > > @@ -137,11 +137,13 @@ static char *log_buf = __log_buf;
> > >  static int log_buf_len = __LOG_BUF_LEN;
> > >  static unsigned logged_chars; /* Number of chars produced since last read+clear operation */
> > >  
> > > +#ifdef CONFIG_KEXEC
> > >  void log_buf_kexec_setup(void)
> > >  {
> > >  	VMCOREINFO_SYMBOL(log_buf);
> > >  	VMCOREINFO_SYMBOL(log_end);
> > >  }
> > > +#endif
> > >  
> > >  static int __init log_buf_len_setup(char *str)
> > >  {
> > > _
> > 
> > Weird, I thought I checked that just now. In any case this email
> > was already in my inbox. In any case, I can now produce the problem,
> > and this patch resolves it.
> > 
> 
> Sorry, i didn't think to check on conditions when CONFIG_KEXEC wasn't set.  I
> assumed we had a stub for all the VMCOREINFO defines.  Why don't we fix it in
> that manner?  I mean we have serveral arch specific additions to vmcoreinfo, all
> of which apparently must be ifdefd for this to work.  Why not just fix it in
> conditional definition?

I didn't do that because then we'd have an empty function log_buf_kexec_setup()
floating about in every vmlinux.

Hardly a big issue, but a bit regrettable.