linux-kernel - Re: [PATCH] dmaengine: remove DMA_MEMCPY

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Date:   Tue, 7 Jun 2022 09:33:33 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Adrian Larumbe <adrianml@...mnos.upm.es>
Cc:     Christoph Hellwig <hch@....de>, michal.simek@...inx.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] dmaengine: remove DMA_MEMCPY_SG once again

On 06-06-22, 20:54, Adrian Larumbe wrote:
> >On 06.06.2022 23:23, Vinod Koul wrote:
> >On 06-06-22, 09:47, Christoph Hellwig wrote:
> >> This was removed before due to the complete lack of users, but
> >> 3218910fd585 ("dmaengine: Add core function and capability check for
> >> DMA_MEMCPY_SG") and 29cf37fa6dd9 ("dmaengine: Add consumer for the new
> >> DMA_MEMCPY_SG API function.") added it back despite still not having
> >> any users whatsoever.
> >> 
> >> Fixes: 3218910fd585 ("dmaengine: Add core function and capability check for DMA_MEMCPY_SG")
> >> Fixes: 29cf37fa6dd9 ("dmaengine: Add consumer for the new DMA_MEMCPY_SG API function.")
> >
> >This is consumer of the driver API and it was bought back with the
> >premise that user will also come...
> 
> It's commit 29cf37fa6dd9 ("dmaengine: Add consumer for the new DMA_MEMCPY_SG API function.")
> 
> The two previous commits add the new driver API callback and document it.
> 
> >Adrianm, Michal any reason why user is not mainline yet..?
> 
> Just double checked the mainline, and all three commits are there.

There are no clients in mainline which call this API. There is a driver
which implements this API, but no users...

$ git grep dmaengine_prep_dma_memcpy_sg
include/linux/dmaengine.h:static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_memcpy_sg(

-- 
~Vinod