Commit b33b890c authored by Stefan Hajnoczi's avatar Stefan Hajnoczi
Browse files

trace: avoid SystemTap dtrace(1) warnings on empty files 



target/hppa/trace-events only contains disabled events, resulting in a
trace-dtrace.dtrace file that says "provider qemu {}".  SystemTap's
dtrace(1) tool prints a warning when processing this input file.

This patch avoids the error by emitting an empty file instead of
"provider qemu {}" when there are no enabled trace events.

Fixes: 23c3d569 ("target/hppa: add TLB trace events")
Reported-by: default avatarMarkus Armbruster <armbru@redhat.com>
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: default avatarMarkus Armbruster <armbru@redhat.com>
Reviewed-by: default avatarLiam Merwick <liam.merwick@oracle.com>
Message-id: 20190321170831.6539-3-stefanha@redhat.com
Message-Id: <20190321170831.6539-3-stefanha@redhat.com>
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent fd985831

scripts/tracetool/format/d.py

+5 −0
Original line number Diff line number Diff line
@@ -33,6 +33,11 @@ def generate(events, backend, group): 
    events = [e for e in events

              if "disable" not in e.properties]



    # SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy

    # with an empty file.  Avoid the warning.

    if not events:

        return



    out('/* This file is autogenerated by tracetool, do not edit. */'

        '',

        'provider qemu {')