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Date: Wed, 18 Aug 2004 13:54:01 -0700
From: "David S. Miller" <davem@redhat.com>
To: Paul Jackson <pj@sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Does io_remap_page_range() take 5 or 6 args?
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On Wed, 18 Aug 2004 13:33:48 -0700
Paul Jackson <pj@sgi.com> wrote:

> Does anyone know the story behind this odd inconsistency?

Each platform needs different args, unfortunately.

Sparc needs the extra arg because the device space is described
with a base 32-bit address, then an upper 32-bit base to form
the full 64-bit address.  This upper 32-bit part is called the
"io_space" and thus is what gets passed into that 6-th argument.