[Bug translator/21833] New: odd 'confusing usage, consider @entry($vmf->address) in .return probe' warnings in tapset/linux/memory.stp

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21833

            Bug ID: 21833
           Summary: odd 'confusing usage, consider @entry($vmf->address)
                    in .return probe' warnings in tapset/linux/memory.stp
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

With HEAD systemtap:

====
# stap -p4 testsuite/buildok/memory-all-probes.stp 
WARNING: cannot probe .return of 1 inlined functions  do_brk
WARNING: confusing usage, consider @entry($addr) in .return probe: identifier
'$addr' at /usr/local/share/systemtap/tapset/linux/memory.stp:194:15
 source:     address = $addr
                       ^
WARNING: confusing usage, consider @entry($len) in .return probe: identifier
'$len' at :195:14
 source:     length = $len
                      ^
WARNING: confusing usage, consider @entry($start) in .return probe: identifier
'$start' at :211:15
 source:     address = $start
                       ^
WARNING: confusing usage, consider @entry($oc->chosen) in .return probe:
identifier '$oc' at :249:16
 source:         task = $oc->chosen
                        ^
WARNING: confusing usage, consider @entry($vmf->address) in .return probe:
identifier '$vmf' at :148:31
 source:     address = @choose_defined($vmf->address,$address)
                                       ^
        in expansion of macro: operator '@value_if_defined' at
/usr/local/share/systemtap/tapset/choose_defined.stpm:3:35
 source:        ( @defined(@value_if_defined) ? (@value_if_defined) :
(@alternate) )
                                                 ^
        in expansion of macro: operator '@choose_defined' at
/usr/local/share/systemtap/tapset/linux/memory.stp:148:15
 source:     address = @choose_defined($vmf->address,$address)

... stuff deleted ...
====

Those warnings are quite odd, since the probes it is complaining about aren't
return probes, they are entry probes.

These are just warnings, but this is still quite confusing.

(Note that these warnings happen before and after the bpf merge, so it isn't
the culprit.)

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