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

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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: 23c3d569f4 ("target/hppa: add TLB trace events")
Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Message-id: 20190321170831.6539-3-stefanha@redhat.com
Message-Id: <20190321170831.6539-3-stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2019-03-21 17:08:31 +00:00
parent fd9858317a
commit b33b890cd0
1 changed files with 5 additions and 0 deletions
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5
scripts/tracetool/format/d.py
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@ -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 {')