perf trace: Do not accept --no-syscalls together with -e

Doesn't make sense and was causing a segfault, fix it.

  # trace -e clone --no-syscalls --event sched:*exec firefox
  The -e option can't be used with --no-syscalls.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ccrahezikdk2uebptzr1eyyi@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index b842ddd3ad0c..d49c131bb5de 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -3344,6 +3344,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
                 goto out;
         }
 
+        err = -1;
+
         if (trace.trace_pgfaults) {
                 trace.opts.sample_address = true;
                 trace.opts.sample_time = true;
@@ -3368,6 +3370,11 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
                 return -1;
         }
 
+        if (!trace.trace_syscalls && ev_qualifier_str) {
+                pr_err("The -e option can't be used with --no-syscalls.\n");
+                goto out;
+        }
+
         if (output_name != NULL) {
                 err = trace__open_output(&trace, output_name);
                 if (err < 0) {