linux-kernel - Re: [PATCH] uio: Support 36-bit physical addresses on 32-bit systems

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Message-ID: <20111014183633.GA30068@suse.de>
Date:	Fri, 14 Oct 2011 12:36:33 -0600
From:	Greg KH <gregkh@...e.de>
To:	"Hans J. Koch" <hjk@...sjkoch.de>
Cc:	Kumar Gala <galak@...nel.crashing.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, Kai Jiang <Kai.Jiang@...escale.com>
Subject: Re: [PATCH] uio: Support 36-bit physical addresses on 32-bit systems

On Fri, Oct 14, 2011 at 08:31:45PM +0200, Hans J. Koch wrote:
> On Thu, Oct 13, 2011 at 10:50:58AM -0500, Kumar Gala wrote:
> > From: Kai Jiang <Kai.Jiang@...escale.com>
> > 
> > To support >32-bit physical addresses for UIO_MEM_PHYS type we need to
> > extend the width of 'addr' in struct uio_mem.  Numerous platforms like
> > embedded PPC, ARM, and X86 have support for systems with larger physical
> > address than logical.
> > 
> > Since 'addr' may contain a physical, logical, or virtual address the
> > easiest solution is to just change the type to 'phys_addr_t' which
> > should always be greater than or equal to the sizeof(void *) such that
> > it can properly hold any of the address types.
> > 
> > For physical address we can support up to a 44-bit physical address on a
> > typical 32-bit system as we utilize remap_pfn_range() for the mapping of
> > the memory region and pfn's are represnted by shifting the address by
> > the page size (typically 4k).
> > 
> > Signed-off-by: Kai Jiang <Kai.Jiang@...escale.com>
> > Signed-off-by: Minghuan Lian <Minghuan.Lian@...escale.com>
> > Signed-off-by: Kumar Gala <galak@...nel.crashing.org>
> 
> Signed-off-by: "Hans J. Koch" <hjk@...sjkoch.de>
> 
> That looks good to me. There's an unnecessary cast (see below), but I fixed that
> on the way.
> 
> Greg, please pull this from branch uio-for-gregkh from
> 
> git://hansjkoch.de/git/linux-hjk

Care to send it as an email?  I can apply it easier that way as I have
limited internet access while on the road.

greg k-h
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