linux-kernel - Re: [PATCH v5 2/7] mm, devm_memremap_pages: Kill mapping "System RAM" support

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Message-ID: <20180914131420.GC27141@lst.de>
Date:   Fri, 14 Sep 2018 15:14:20 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     akpm@...ux-foundation.org, Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        alexander.h.duyck@...el.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/7] mm, devm_memremap_pages: Kill mapping "System
 RAM" support

On Wed, Sep 12, 2018 at 07:22:11PM -0700, Dan Williams wrote:
> Given the fact that devm_memremap_pages() requires a percpu_ref that is
> torn down by devm_memremap_pages_release() the current support for
> mapping RAM is broken.

I agree.  Do you remember why we even added it in the first place?

Signed-off-by: Christoph Hellwig <hch@....de>