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From: Greg KH <gregkh@suse.de>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: hjk@linutronix.de,
	"linux-kernel@vger.kernel.org List"
	<linux-kernel@vger.kernel.org>
Subject: Re: UIO support for >32-bit physical addresses on 32-bit platforms
Date: Tue, 23 Feb 2010 07:01:41 -0800	[thread overview]
Message-ID: <20100223150140.GA3781@suse.de> (raw)
In-Reply-To: <A596AEB5-BAF0-4BF9-A9C0-44C50B9BCA34@kernel.crashing.org>

On Tue, Feb 23, 2010 at 08:54:16AM -0600, Kumar Gala wrote:
> Hans, Greg,
> 
> We are looking at using UIO for some driver work and noticed it
> assumes the address for MMIO regions is an 'unsigned long'.  This is a
> problem for the platforms we have in which we support a 36-bit
> physical address in a 32-bit machine.
> 
> Should we just change addr/size in struct uio_mem to u64 always?  At
> first I was thinking phys_addr_t but realized the addr could be PHYS,
> LOGICAL, or VIRTUAL.

I think that would work out fine, Hans, any ideas if this would cause
any problems with existing code or not?

thanks,

greg k-h

  reply	other threads:[~2010-02-23 15:01 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-23 14:54 UIO support for >32-bit physical addresses on 32-bit platforms Kumar Gala
2010-02-23 15:01 ` Greg KH [this message]
2010-02-23 19:49   ` Hans J. Koch
2010-02-23 22:52     ` Kumar Gala
2010-02-23 23:39       ` Hans J. Koch
2010-02-24  3:24         ` Kumar Gala
2010-02-24 13:47           ` Hans J. Koch

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