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Date:   Fri, 16 Aug 2019 14:06:23 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Christoph Hellwig <hch@lst.de>
Cc:     Jason Gunthorpe <jgg@mellanox.com>,
        Christoph Hellwig <hch@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas =?ISO-8859-1?Q?Hellstr=F6m?= <thomas@shipmail.org>,
        Jerome Glisse <jglisse@redhat.com>,
        Steven Price <steven.price@arm.com>,
        Linux-MM <linux-mm@kvack.org>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        Minchan Kim <minchan@kernel.org>
Subject: Re: cleanup the walk_page_range interface
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On Fri, 16 Aug 2019 14:32:58 +0200 Christoph Hellwig <hch@lst.de> wrote:

> On Fri, Aug 16, 2019 at 11:57:40AM +0000, Jason Gunthorpe wrote:
> > Are there conflicts with trees other than hmm?
> > 
> > We can put it on a topic branch and merge to hmm to resolve. If hmm
> > has problems then send the topic on its own?
> 
> I see two new walk_page_range user in linux-next related to MADV_COLD
> support (which probably really should use walk_range_vma), and then
> there is the series from Steven, which hasn't been merged yet.

Would it be practical to create a brand new interface with different
functions names all in new source files?  Once all callers are migrated
over and tested, remove the old code?