From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755896Ab3AUSW1 (ORCPT ); Mon, 21 Jan 2013 13:22:27 -0500 Received: from mail.kernel.org ([198.145.19.201]:33788 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755418Ab3AUSWZ (ORCPT ); Mon, 21 Jan 2013 13:22:25 -0500 Date: Mon, 21 Jan 2013 10:23:45 -0800 From: Greg KH To: Jon Mason Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Dave Jiang , Nicholas Bellinger Subject: Re: [PATCH 01/21] NTB: correct missing readq/writeq errors Message-ID: <20130121182345.GC5499@kroah.com> References: <1358586155-23322-1-git-send-email-jon.mason@intel.com> <1358586155-23322-2-git-send-email-jon.mason@intel.com> <20130120234005.GA14196@kroah.com> <20130121173818.GD22208@jonmason-lab> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130121173818.GD22208@jonmason-lab> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 21, 2013 at 10:38:18AM -0700, Jon Mason wrote: > On Sun, Jan 20, 2013 at 03:40:05PM -0800, Greg KH wrote: > > On Sat, Jan 19, 2013 at 02:02:15AM -0700, Jon Mason wrote: > > > Atomic readq and writeq do not exist by default on some 32bit > > > architectures, thus causing compile errors due to non-existent symbols. > > > In those cases, use the definitions of those symbols from > > > include/asm-generic/io-64-nonatomic-hi-lo.h > > > > > > Signed-off-by: Jon Mason > > > --- > > > drivers/ntb/ntb_hw.c | 1 + > > > 1 file changed, 1 insertion(+) > > > > > > diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c > > > index 4c71b17..0b46fef 100644 > > > --- a/drivers/ntb/ntb_hw.c > > > +++ b/drivers/ntb/ntb_hw.c > > > @@ -45,6 +45,7 @@ > > > * Contact Information: > > > * Jon Mason > > > */ > > > +#include > > > > Really? This seems really odd. Usually we just don't build the code > > for any platform that doesn't have readq/writeq. Otherwise, shouldn't > > those arches just include this file themselves to keep everything > > working? Individual drivers shouldn't have to do this. > > There is no readq/writeq for 32bit x86. I was using this header file > to get around that. I freely admit that I have done 0 testing on > 32bit, but it should work. If you prefer I modify the Kconfig to only > enable this for x86_64 until such time as I test on x86_32, I will > happily submit that patch. No, other drivers on 32bit x86 also use readq, and do not include this asm header file. So there is a proper way to do this, just dig through the header file include mess to determine the proper one to include. You should never have to include asm-generic file directly, that's the issue here. thanks, greg k-h