linux-mips
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Re: PATCH: Fix offset of mmap

To: "H . J . Lu" <hjl@lucon.org>
Subject: Re: PATCH: Fix offset of mmap
From: James Simmons <jsimmons@transvirtual.com>
Date: Fri, 14 Sep 2001 10:27:20 -0700 (PDT)
Cc: linux-mips@oss.sgi.com
In-reply-to: <20010914101549.A16156@lucon.org>
Sender: owner-linux-mips@oss.sgi.com
> > I believe this would break certain pieces of hardware. For example the
> > mq200 framebuffer in the sigmarion is not paged aligned. You have to
> > supply a offset to make it work.
> 
> How do you mmap a memory whose offset is not page aligned? The code
> here is
> 
> return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
>                                           ^^^^^^^^^^^^^^^^^^^^
> 
> It is up to the user code to make sure everything is ok.

Sorry. Mix up in the meaning of offset. 



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