linux-kernel - Re: [PATCH 21/22] mmc: wbsd: Use dma_alloc

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Date:   Tue, 22 Feb 2022 21:40:02 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, cl@...ux.com, 42.hyeyoo@...il.com,
        penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        vbabka@...e.cz, David.Laight@...lab.com, david@...hat.com,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        linux-crypto@...r.kernel.org, steffen.klassert@...unet.com,
        netdev@...r.kernel.org, hca@...ux.ibm.com, gor@...ux.ibm.com,
        agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com,
        svens@...ux.ibm.com, linux-s390@...r.kernel.org, michael@...le.cc,
        linux-i2c@...r.kernel.org, wsa@...nel.org
Subject: Re: [PATCH 21/22] mmc: wbsd: Use dma_alloc_noncoherent() for dma
 buffer

On 02/22/22 at 02:11pm, Christoph Hellwig wrote:
> On Tue, Feb 22, 2022 at 05:14:16PM +0800, Baoquan He wrote:
> > > No, if you change it, it should be dma_set_coherent_mask only as it is
> > > not using streaming mappings.  I suspect dma_set_mask_and_coherent is
> > > the right thing if the driver ever wants to use streaming mapping,
> > > it would just need to be documented in the commit message.
> > 
> > It will serve dma_alloc_noncoherent() calling later, should be streaming
> > mapping?
> 
> No, that also looks at the coherent mask.  Which is a bit misnamed these
> days, it really should be the alloc mask.

I noticed the misnamed code and have made two draft patches, please help
check if it's necessary.