problems displaying offsets...

[Steve Dickson]

In need of a second pair of eyes... 

probe kernel.function("kernel_sendpage")
{
    size = ulong_arg(4)
    printf("kernel_sendpage: offset %d size %d\n", $offset, size);
}

>From some reason the offset displayed is always zero in the
above probe and I know for fact its not always zero... 

I'm have the same problem in I/O probes in the nfsd.proc.commit 
probe... Does anybody see what I'm doing wrong?

tia,

steved.