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

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Date:	Sat, 15 Aug 2015 18:00:55 +0200
From:	Christoph Hellwig <hch@....de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Christoph Hellwig <hch@....de>,
	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 08:44:27AM -0700, Dan Williams wrote:
> That said, while we don't need special accessors we do need guarantees
> that anything that has written to a persistent memory address has done
> so in a way that wmb_pmem() is able to flush it.  It's more of a "I've
> audited this code path for wmb_pmem() compatibility so use this api to
> write to pmem."

I'm more worried about things where don't just do plain loads and stores
to a pmem region but DMA, which will end up as a nightmare of casts.

But we can wait and see how that evolves in the end..
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