linux-kernel - Re: linux-next: build failure after merge of the final tree (net-next tree related)

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Message-ID: <1348179764.1132.35.camel@pasglop>
Date:	Fri, 21 Sep 2012 08:22:44 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...ts.ozlabs.org,
	David Miller <davem@...emloft.net>,
	mika.westerberg@...ux.intel.com, netdev@...r.kernel.org,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: build failure after merge of the final tree
 (net-next tree related)

> > 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.

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