Re: PATCH: Fix offset of mmap

["H . J . Lu" <hjl@lucon.org>]

On Fri, Sep 14, 2001 at 10:10:58AM -0700, James Simmons wrote:
> 
> > We should check if offset of mmap is on the page boundary.
> 
> 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.


H.J.