linux-kernel - Re: [PATCH 12/21] dma-iommu: factor atomic pool allocations into helpers

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Message-ID: <20190417063358.GA24139@lst.de>
Date:   Wed, 17 Apr 2019 08:33:58 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>, Joerg Roedel <joro@...tes.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/21] dma-iommu: factor atomic pool allocations into
 helpers

On Wed, Apr 10, 2019 at 08:11:57AM +0200, Christoph Hellwig wrote:
> On Tue, Apr 09, 2019 at 06:59:32PM +0100, Robin Murphy wrote:
> > On 27/03/2019 08:04, Christoph Hellwig wrote:
> >> This keeps the code together and will simplify compiling the code
> >> out on architectures that are always dma coherent.
> >
> > And this is where things take a turn in the direction I just can't get on 
> > with - I'm looking at the final result and the twisty maze of little 
> > disjoint helpers all overlapping each other in functionality is really 
> > difficult to follow. And I would *much* rather have things rely on 
> > compile-time constant optimisation than spend the future having to fix the 
> > #ifdefed parts for arm64 whenever x86-centric changes fail to test them.
> 
> Can you draft up a patch on top of my series to show me what you
> want?  I can take care of finishing it up and moving the changes
> into the right patches in the series.

Any chance to make some progress on this?  Or at least a better
description of what you want?