linux-kernel - Re: [PATCH V3 01/21] dax: move dax_pgoff_to_phys from [drivers/dax/] device.c to bus.c

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Message-ID: <20260108152010.00003829@huawei.com>
Date: Thu, 8 Jan 2026 15:20:10 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: John Groves <John@...ves.net>
CC: Miklos Szeredi <miklos@...redi.hu>, Dan Williams
	<dan.j.williams@...el.com>, Bernd Schubert <bschubert@....com>, "Alison
 Schofield" <alison.schofield@...el.com>, John Groves <jgroves@...ron.com>,
	Jonathan Corbet <corbet@....net>, Vishal Verma <vishal.l.verma@...el.com>,
	Dave Jiang <dave.jiang@...el.com>, Matthew Wilcox <willy@...radead.org>, Jan
 Kara <jack@...e.cz>, Alexander Viro <viro@...iv.linux.org.uk>, "David
 Hildenbrand" <david@...nel.org>, Christian Brauner <brauner@...nel.org>,
	"Darrick J . Wong" <djwong@...nel.org>, Randy Dunlap <rdunlap@...radead.org>,
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 Hajnoczi <shajnocz@...hat.com>, Joanne Koong <joannelkoong@...il.com>, Josef
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 Joshi <ajayjoshi@...ron.com>, <venkataravis@...ron.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nvdimm@...ts.linux.dev>, <linux-cxl@...r.kernel.org>,
	<linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH V3 01/21] dax: move dax_pgoff_to_phys from
 [drivers/dax/] device.c to bus.c

On Thu, 8 Jan 2026 07:25:47 -0600
John Groves <John@...ves.net> wrote:

> On 26/01/08 10:43AM, Jonathan Cameron wrote:
> > On Wed,  7 Jan 2026 09:33:10 -0600
> > John Groves <John@...ves.net> wrote:
> >   
> > > This function will be used by both device.c and fsdev.c, but both are
> > > loadable modules. Moving to bus.c puts it in core and makes it available
> > > to both.
> > > 
> > > No code changes - just relocated.
> > > 
> > > Signed-off-by: John Groves <john@...ves.net>  
> > Hi John,
> > 
> > I don't know the code well enough to offer an opinion on whether this
> > move causes any issues or if this is the best location, so review is superficial
> > stuff only.
> > 
> > Jonathan
> >   
> > > ---
> > >  drivers/dax/bus.c    | 27 +++++++++++++++++++++++++++
> > >  drivers/dax/device.c | 23 -----------------------
> > >  2 files changed, 27 insertions(+), 23 deletions(-)
> > > 
> > > diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
> > > index fde29e0ad68b..a2f9a3cc30a5 100644
> > > --- a/drivers/dax/bus.c
> > > +++ b/drivers/dax/bus.c
> > > @@ -7,6 +7,9 @@
> > >  #include <linux/slab.h>
> > >  #include <linux/dax.h>
> > >  #include <linux/io.h>
> > > +#include <linux/backing-dev.h>  
> > 
> > I'm not immediately spotting why this one.  Maybe should be in a different
> > patch?
> >   
> > > +#include <linux/range.h>
> > > +#include <linux/uio.h>  
> > 
> > Why this one?  
> 
> Good eye, thanks. These must have leaked from some of the many dead ends
> that I tried before coming up with this approach.
> 
> I've dropped all new includes and it still builds :D

Range one should be there... 

> 
> > 
> > Style wise, dax seems to use reverse xmas tree for includes, so
> > this should keep to that.
> >   
> > >  #include "dax-private.h"
> > >  #include "bus.h"
> > >  
> > > @@ -1417,6 +1420,30 @@ static const struct device_type dev_dax_type = {
> > >  	.groups = dax_attribute_groups,
> > >  };
> > >  
> > > +/* see "strong" declaration in tools/testing/nvdimm/dax-dev.c  */  
> > Bonus space before that */
> > Curiously that wasn't there in the original.  
> 
> Removed.
> 
> [ ... ]
> 
> Thanks,
> John