linux-kernel - Re: [PATCH v2 7/7] pmem, dax: have direct_access use _

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Message-ID: <CAPcyv4hKsew+pNS+2i9rvfR+JCsXcKFURaQ2Cf3t5HZoTWWsvg@mail.gmail.com>
Date:	Sat, 15 Aug 2015 08:49:14 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Jonathan Corbet <corbet@....net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Jens Axboe <axboe@...nel.dk>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, Alexander Viro <viro@...iv.linux.org.uk>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Jeff Layton <jlayton@...marydata.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Omar Sandoval <osandov@...ndov.com>,
	Boaz Harrosh <boaz@...xistor.com>,
	Miklos Szeredi <mszeredi@...e.cz>, Jan Kara <jack@...e.cz>,
	Wolfram Sang <wsa@...-dreams.de>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Gerald Schaefer <gerald.schaefer@...ibm.com>,
	Ameen Ali <ameenali023@...il.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	Mike Snitzer <snitzer@...hat.com>, Tejun Heo <tj@...nel.org>,
	Shaohua Li <shli@...com>, Ming Lei <ming.lei@...onical.com>,
	linux-doc@...r.kernel.org,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	linux-s390@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation

On Sat, Aug 15, 2015 at 2:11 AM, Christoph Hellwig <hch@....de> wrote:
> On Fri, Aug 14, 2015 at 09:58:16AM -0700, Dan Williams wrote:
>> > I'll merge with your code for v3.
>>
>> Sounds, let me go rebase the __pfn_t patches on -mm so we'all lined up
>> and collision free.
>
> I'm doubt that we'll have PFN mapping ready for 4.3.  I'd rather see
> Ross series goes first, and move the patch to remove the size argument
> from ->direct access [1] over to this series as well.
>
> [1] https://git.kernel.org/cgit/linux/kernel/git/djbw/nvdimm.git/commit/?h=pfn&id=8e15e69fb9e61ac563c5a7ffd9dd9a7b545cced3

Yes, let's do it.  The need for DAX persistence guarantees is a higher
priority than solving the DAX vs PMEM unbind bug.  Especially if we
can defer __pfn_t and get some basic struct page mapping into 4.3 as
well.
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