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

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Date:	Thu, 13 Aug 2015 14:20:33 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:	"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>,
	Christoph Hellwig <hch@....de>,
	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 Thu, Aug 13, 2015 at 9:51 AM, Ross Zwisler
<ross.zwisler@...ux.intel.com> wrote:
> Update the annotation for the kaddr pointer returned by direct_access()
> so that it is a __pmem pointer.  This is consistent with the PMEM driver
> and with how this direct_access() pointer is used in the DAX code.
>
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
> ---
>  Documentation/filesystems/Locking |  3 ++-
>  arch/powerpc/sysdev/axonram.c     |  7 ++++---
>  drivers/block/brd.c               |  4 ++--
>  drivers/nvdimm/pmem.c             |  4 ++--
>  drivers/s390/block/dcssblk.c      | 10 +++++----
>  fs/block_dev.c                    |  2 +-
>  fs/dax.c                          | 44 +++++++++++++++++++++------------------
>  include/linux/blkdev.h            |  8 +++----
>  8 files changed, 45 insertions(+), 37 deletions(-)
>
> diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
> index 6a34a0f..06d4434 100644
> --- a/Documentation/filesystems/Locking
> +++ b/Documentation/filesystems/Locking
> @@ -397,7 +397,8 @@ prototypes:
>         int (*release) (struct gendisk *, fmode_t);
>         int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
>         int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
> -       int (*direct_access) (struct block_device *, sector_t, void **, unsigned long *);
> +       int (*direct_access) (struct block_device *, sector_t, void __pmem **,
> +                               unsigned long *);

So this collides with the __pfn_t work.  I think the we have a
reasonable chance of getting that in to 4.3, so I'd wait to see if we
hit any major roadblocks with that set [1] before merging these.

[1]: https://lists.01.org/pipermail/linux-nvdimm/2015-August/001803.html
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