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

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Date:	Sat, 22 Sep 2012 16:00:27 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	benh@...nel.crashing.org
Cc:	sfr@...b.auug.org.au, paulus@...ba.org,
	linuxppc-dev@...ts.ozlabs.org, 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)

From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Date: Sat, 22 Sep 2012 07:46:40 +1000

> Right, but on ppc, GFP_DMA is a nop (no separate ZONE_DMA, or rather all
> of memory is ZONE_DMA). It's always been like that afaik.
> 
> We could support ISA device limited addressability using the iommu but
> that would involve a map/unmap type API (which I remember we did support
> in the old days by passing NULL to pci_map_*, but we dropped that along
> the way).

I think I'm going to just end up restricting this driver to X86
as was originally suggested.

There seems to be no real consistent Kconfig protection for users
of isa_virt_to_bus() and friends.

We know that ISA_DMA_API doesn't do it, and ISA doesn't do it either
as powerpc also allows that to bet set for CHRP and friends.

Thanks.
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