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

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!

quoted

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.

quoted

_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@linux-wlan.com
Maitland, FL 32794-1149    Phone:  407.644.8582
USA                        Fax:    407.539.1294


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