Accessing kernel global variables

[Mike Mason]

Is systemtap able to access global kernel variables in a probe? The buildok/seventeen.stp test is failing for me on both FC5 and SLES 10 on x86_64.

Mike

Error:

semantic error: libdwfl failure (dwfl_addrmodule): Operation not permitted: identifier '$write_fifo_fops' at seventeen.stp:8:19

buildok/seventeen.stp:

probe kernel.function("pipe_write")
{
        printf("0x%x\n", $write_fifo_fops->llseek)
}