[tip:perf/core] perf trace: Do not show syscall tracepoint filter in the --no-syscalls case

[tip-bot for Arnaldo Carvalho de Melo <tipbot@zytor.com>]

Commit-ID:  2e5e5f876143b147b98d0c0854b5fc577412b05b
Gitweb:     http://git.kernel.org/tip/2e5e5f876143b147b98d0c0854b5fc577412b05b
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Mon, 3 Aug 2015 17:12:29 -0300
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 5 Aug 2015 10:52:19 -0300

perf trace: Do not show syscall tracepoint filter in the --no-syscalls case

We were accessing trace->syscalls.events members even when that struct
wasn't initialized, i.e. --no-syscalls was specified on the command
line, fix it to show that, still in debug mode, when we have an event
qualifier list, i.e. when we actually are doing subset syscall tracing.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Milian Wolff <mail@milianw.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Fixes: 19867b6186f3 ("perf trace: Use event filters for the event qualifier list")
Link: http://lkml.kernel.org/n/tip-7980ym6vujgh3yiai0cqzc88@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-trace.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 06cfa93..3cfca93 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2394,9 +2394,10 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 		err = trace__set_ev_qualifier_filter(trace);
 		if (err < 0)
 			goto out_errno;
-	}
 
-	pr_debug("%s\n", trace->syscalls.events.sys_exit->filter);
+		pr_debug("event qualifier tracepoint filter: %s\n",
+			 trace->syscalls.events.sys_exit->filter);
+	}
 
 	err = perf_evlist__apply_filters(evlist, &evsel);
 	if (err < 0)