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

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Date:   Thu, 18 Apr 2019 18:35:12 +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 Thu, Apr 18, 2019 at 04:06:56PM +0100, Robin Murphy wrote:
> OK, I'm still looking at mmap and get_sgtable, but for now I've pushed out 
> a partial branch that consolidates alloc and free in a way which makes 
> sense to me:
>
>   git://linux-arm.org/linux-rm  dma/rework
>
> Please let me know what you think.

>From a very high level POV this looks ok, but sometimes a bit to
convoluted to me.  The major issue why I went with the version I posted
is that I can cleanly ifdef out the remap code in just a few sections.
In this version it is spread out a lot more, and the use of IS_ENABLED
means that we'd need a lot more stubs for functionality that won't
ever be called but needs to be compilable.