linux-kernel - Re: [PATCH] dma: remove bad_dma

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Message-ID: <20160613121105.GA12857@sudip-tp>
Date:	Mon, 13 Jun 2016 13:11:05 +0100
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Simran Rai <ssimran@...adcom.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] dma: remove bad_dma_ops to fix build fail

On Mon, Jun 13, 2016 at 12:59:11PM +0100, Mark Brown wrote:
> On Mon, Jun 13, 2016 at 11:51:08AM +0100, Sudip Mukherjee wrote:
> > On Mon, Jun 13, 2016 at 10:29:34AM +0100, Mark Brown wrote:
> 
> > > Right, we've got a couple of obscure architectures with no DMA support
> > > which are leading to a constant stream of patches like this that are
> > > being triggered by compile coverage stuff.  In situations like this we
> > > very often provide stubs rather than having to handle this in lots of
> > > different places in the code.
> 
> > Ok, I will do that. But I am seeing arch/m32r/include/asm/m32102.h is
> > defining the DMA Controller registers and also a MAX_DMA_ADDRESS is
> > defined in dma.h. Doesn't that mean that this arch is capable of DMA?
> 
> Quite possibly, but they don't seem to implement the standard interfaces
> for generic code (this sort of thing is quite common for the less widely
> used architectures sadly).

If only I had a board to play with the DMA code. :(

I will go for the stub like you said.

Regards
Sudip