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Date: Fri, 22 Feb 2002 18:22:31 -0800
From: Richard Henderson <rth@twiddle.net>
To: Steffen Persvold <sp@scali.com>
Cc: "Jeff V. Merkey" <jmerkey@vger.timpanogas.org>,
        linux-kernel@vger.kernel.org, jmerkey@timpanogas.org
Subject: Re: ioremap()/PCI sickness in 2.4.18-rc2 (FIXED ALMOST)
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In-Reply-To: <3C7626A9.330A9249@scali.com>; from sp@scali.com on Fri, Feb 22, 2002 at 12:08:25PM +0100
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On Fri, Feb 22, 2002 at 12:08:25PM +0100, Steffen Persvold wrote:
> I think you'll have to check again. In LP64 programming models (used on most
> 64-bit OS'es) 'long' is 64 bit. Thus a 'unsigned long' is always safe to use
> for pointer arithmetic since it will be 32 bit on 32bit machines and 64bit on
> 64bit machines.

This isn't something you should count on universally.  There
are targets that have a 64-bit long, but a 32-bit pointer.

Seems unlikely to show up on linux, but...


r~
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