Can't mmap the top 1MB of /dev/mem?

[Mark S. Mathews]

I figured it was something like that.  Shouldn't that expression be
testing the topmost address of the mmap'd region instead of one beyond it?

i.e.:

   if ( (off+len-1) < off )
	return EINVAL;


It works on the G3?  Perhaps the compiler/processor difference is getting
you into some of the 64-bit register goofiness or a slightly different
code sequence that does something different w/ the overflow flag.  Just
guessing here.

-Mark


On Thu, 22 Jun 2000, Pavel Roskin wrote:

>
> Hello, Mark!
>
> > If it _were_ extremely  important I could always trace the mmap system
> > call.
>
> I already know that it happens in do_mmap(), at this point:
>
> /* offset overflow? */
> if (off + len < off)
>         return -EINVAL;
>
> I'm puzzled why it doesn't happen on G3.
>
> > _That's_ why Linux is so cool.
>
> Yup.
>
> Pavel
>
>
>


Mark S. Mathews

AbsoluteValue Systems      Web:    http://www.linux-wlan.com
P.O. Box 941149            e-mail: mark at linux-wlan.com
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