[Bug runtime/10190] New: Suppress registration warnings for optional probes

[jistone at redhat dot com]

When a kprobe fails to register, WARNINGS are printed to let the user know:

  $ stap -e 'probe kprobe.function("foo") ? { exit() }'
  WARNING: probe kprobe.function("foo")? registration error (rc -22)
  ^C

Since kprobe.function can't be resolved until runtime, scripts may have to
specify multiple alternative functions to probe.  It becomes annoying to the
user though that registration warnings are printed for the unused functions. 
Also, if enough of these WARNINGS are printed, you can lose the STP_START as per
PR10189.

It would be nice if the WARNING could be suppressed for registration failures on
probes with the optional '?' flag.

-- 
           Summary: Suppress registration warnings for optional probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: jistone at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10190

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