linux-kernel - Re: [PATCH 4/6] dma-mapping: merge direct and noncoherent ops

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Date:   Thu, 1 Nov 2018 06:13:59 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:     Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Paul Burton <paul.burton@...s.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] dma-mapping: merge direct and noncoherent ops

On Wed, Oct 31, 2018 at 08:50:53PM +0000, Maciej W. Rozycki wrote:
> On Wed, 31 Oct 2018, Christoph Hellwig wrote:
> 
> > Can you send me your .config?
> 
>  Sure, attached.
> 
>  This is an updated 4.19 defconfig I was going to submit as I tripped over 
> this problem, so just rename it to .config and use `make olddefconfig' to 
> regenerate a full version.

Fails to compile for me with:

cc1: error: ‘-march=r3000’ requires ‘-mfp32’

using the x86_64 corss gcc 8 from Debian testing.

Either way the config looks like we have all the required bits for
non-coherent dma support.  The only guess is that somehow
dma_cache_wback_inv aren't hooked up to the right functions for some
reason, but I can't really think off why.