linux-kernel - Re: [RFC v1 1/4] dma-mapping: introduce the DMA_ATTR_MAY

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Date:   Tue, 28 Mar 2023 05:57:25 +0200
From:   Christoph Hellwig <hch@....de>
To:     Petr Tesarik <petrtesarik@...weicloud.com>
Cc:     Jonathan Corbet <corbet@....net>, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Borislav Petkov <bp@...e.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Kim Phillips <kim.phillips@....com>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DMA MAPPING HELPERS" <iommu@...ts.linux.dev>,
        Roberto Sassu <roberto.sassu@...wei.com>, petr@...arici.cz
Subject: Re: [RFC v1 1/4] dma-mapping: introduce the DMA_ATTR_MAY_SLEEP
 attribute

On Mon, Mar 20, 2023 at 01:28:13PM +0100, Petr Tesarik wrote:
> From: Petr Tesarik <petr.tesarik.ext@...wei.com>
> 
> Introduce a DMA attribute to tell the DMA-mapping subsystem that
> the operation is allowed to sleep.
> 
> This patch merely adds the flag, which is not used for anything at
> the moment. It should be used by users who can sleep (e.g. dma-buf
> ioctls) to allow page reclaim and/or allocations from CMA.

So what drivers would call this?  As-is it doesn't have any users in
the series.