From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <benh@kernel.crashing.org>
Received: from gate.crashing.org (gate.crashing.org [63.228.1.57])
 (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
 (Client did not present a certificate)
 by ozlabs.org (Postfix) with ESMTPS id DE7B02C007B
 for <linuxppc-dev@lists.ozlabs.org>; Fri, 21 Sep 2012 08:23:04 +1000 (EST)
Message-ID: <1348179764.1132.35.camel@pasglop>
Subject: Re: linux-next: build failure after merge of the final tree
 (net-next tree related)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Fri, 21 Sep 2012 08:22:44 +1000
In-Reply-To: <20120921081531.67db8a7d0ac1b35426b22c45@canb.auug.org.au>
References: <20120920173622.2aa7209cd241a3945f4384d4@canb.auug.org.au>
 <20120920091013.GV15548@intel.com>
 <20120920.164558.2281417114805373564.davem@davemloft.net>
 <20120921081531.67db8a7d0ac1b35426b22c45@canb.auug.org.au>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Cc: mika.westerberg@linux.intel.com, netdev@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-next@vger.kernel.org,
 Paul Mackerras <paulus@samba.org>, linuxppc-dev@lists.ozlabs.org,
 David Miller <davem@davemloft.net>
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>


> > I think the powerpc port is at fault here.
> > 
> > Part of being able to advertise ISA_DMA_API is providing isa_virt_to_bus().

Hrm, that's ancient gunk, I'll have to dig. We potentially can support
ISA devices DMA'ing from an ISA bridge... but via the iommu, which means
isa_virt_to_bus is a non-starter.

But then, do we really care ? IE. Is there single device that actually
requires ISA_DMA_API and that is expected to work on any currently
supported powerpc hw ? :-)

We don't even support PReP anymore, so that leaves us with what ?

Anybody has an objection to turning ISA_DMA_API off ?

Cheers,
Ben.