linux-kernel - Re: [PATCH] dma-contiguous: add optional cma

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Message-ID: <20220923144804.GA18477@lst.de>
Date:   Fri, 23 Sep 2022 16:48:04 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Nate Drude <nate.d@...iscite.com>, iommu@...ts.linux.dev,
        Jonathan Corbet <corbet@....net>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Borislav Petkov <bp@...e.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Muchun Song <songmuchun@...edance.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        eran.m@...iscite.com
Subject: Re: [PATCH] dma-contiguous: add optional cma_name for cma= kernel
 parameter

On Tue, Sep 13, 2022 at 11:45:17AM +0100, Robin Murphy wrote:
> If userspace expects the CMA heap driver to expose a consistent name for 
> CMA heaps, shouldn't it be the CMA heap driver's responsibility to expose a 
> consistent name for CMA heaps? Tinkering with the core CMA code doesn't 
> feel like the right approach.

Agreed.  In fact I think exposing this name in a uapi seems like a really
bad idea that is asking for a lot of trouble.