linux-kernel - Re: [PATCH 16/17] memremap: change devm_memremap_pages interface to use struct dev

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Message-ID: <20171219150347.GC13124@lst.de>
Date:   Tue, 19 Dec 2017 16:03:47 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        X86 ML <x86@...nel.org>, Linux MM <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 16/17] memremap: change devm_memremap_pages interface
        to use struct dev_pagemap

On Sun, Dec 17, 2017 at 10:51:56AM -0800, Dan Williams wrote:
> On Fri, Dec 15, 2017 at 6:09 AM, Christoph Hellwig <hch@....de> wrote:
> > From: Logan Gunthorpe <logang@...tatee.com>
> >
> > This new interface is similar to how struct device (and many others)
> > work. The caller initializes a 'struct dev_pagemap' as required
> > and calls 'devm_memremap_pages'. This allows the pagemap structure to
> > be embedded in another structure and thus container_of can be used. In
> > this way application specific members can be stored in a containing
> > struct.
> >
> > This will be used by the P2P infrastructure and HMM could probably
> > be cleaned up to use it as well (instead of having it's own, similar
> > 'hmm_devmem_pages_create' function).
> >
> > Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> > Signed-off-by: Christoph Hellwig <hch@....de>
> 
> Looks good, I notice that this does not initialize pgmap->type to
> MEMORY_DEVICE_HOST, but since that value is zero and likely won't
> change we're ok.

I'll add it jut for clarity.