linux-kernel - Re: [RFC][PATCH 1/2] uio: allow drivers to override the pgprot for mmap

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Message-ID: <20111029063809.GC2280@kroah.com>
Date:	Sat, 29 Oct 2011 08:38:09 +0200
From:	Greg KH <greg@...ah.com>
To:	"Hans J. Koch" <hjk@...sjkoch.de>
Cc:	Kumar Gala <galak@...nel.crashing.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 1/2] uio: allow drivers to override the pgprot for
 mmap

On Fri, Oct 28, 2011 at 11:48:12PM +0200, Hans J. Koch wrote:
> On Fri, Oct 28, 2011 at 10:50:29AM -0500, Kumar Gala wrote:
> > For some devices, the default behavior of pgprot_noncached() is not
> > appropriate for all of its mappable regions. This provides a means for
> > the kernel side of the UIO driver to override the flags without having
> > to implement its own full mmap callback.
> 
> Thanks for also providing an example driver showing the use of this.
> You should also post this driver in a mainline-ready version, I'm a bit
> uncomfortable with adding a new function pointer without having any users.

I'm more than "uncomfortable", I'll refuse to take any such patch unless
there is a in-kernel user, otherwise it makes no sense to add the
pointer at all.

thanks,

greg k-h
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