Re: [RFC PATCH 0/7] evacuate struct page from the block layer

From: Christoph Hellwig <hch@infradead.org>
To: Rik van Riel <riel@redhat.com>
Cc: Boaz Harrosh <boaz@plexistor.com>,
	Matthew Wilcox <willy@linux.intel.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Williams <dan.j.williams@intel.com>,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	axboe@kernel.dk, linux-nvdimm@ml01.01.org,
	Dave Hansen <dave.hansen@linux.intel.com>,
	linux-raid@vger.kernel.org, mgorman@suse.de, hch@infradead.org,
	linux-fsdevel@vger.kernel.org,
	"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [RFC PATCH 0/7] evacuate struct page from the block layer
Date: Mon, 23 Mar 2015 12:30:17 -0700	[thread overview]
Message-ID: <20150323193017.GA14179@infradead.org> (raw)
In-Reply-To: <55102EEB.2090401@redhat.com>

On Mon, Mar 23, 2015 at 11:19:07AM -0400, Rik van Riel wrote:
> There are two things going on here:
> 
> 1) You want to keep using struct page for now, while there are
>    subsystems that require it. This is perfectly legitimate.
> 
> 2) Matthew and Dan are changing over some subsystems to no longer
>    require struct page. This is perfectly legitimate.
> 
> I do not understand why either of you would have to object to what
> the other is doing. There is room to keep using struct page until
> the rest of the kernel no longer requires it.

*nod*

I'd really like to merge the struct page based pmem driver ASAP.  We can
then look into work that avoid the need for struct page, and I think Dan
is doing some good work in that direction.