#! stap -Wp2

# Each of the @defined should be a valid symbol, and sometimes their expansion
# leads to a new function declaration.  We don't want to get warnings when such
# functions turn out to be unused and are elided.

probe kernel.function("sys_open") { println(@defined($mode) ? 1 : $nosuchvar) }
probe kernel.trace("sched_switch")? { println(@defined($next->pid) ? 1 : $nosuchvar) }
probe procfs.write { println(@defined($value) ? 1 : $nosuchvar) }
probe begin { println(@defined(@cast(0, "task_struct")->pid) ? 1 : $nosuchvar) }