linux-kernel - Re: dma_mmap

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Message-ID: <20190906072037.GA29459@infradead.org>
Date:   Fri, 6 Sep 2019 00:20:37 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org,
        "pv-drivers@...are.com" <pv-drivers@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Christian König <christian.koenig@....com>
Subject: Re: dma_mmap_fault discussion

On Fri, Sep 06, 2019 at 09:10:08AM +0200, Thomas Hellström (VMware) wrote:
> It's definitely possible. I was just wondering whether it was necessary, but
> it seems like it.

Yepp.

I've pushed a new version out (even hotter off the press) that doesn't
require the region for dma_mmap_prepare, and also uses PAGE_SIZE units
for the offset / length in dma_mmap_fault, which simplifies a few
things.