6 files changed, 17 insertions, 51 deletions

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index fc21ad79dd83..a85936f09f3e 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -342,22 +342,10 @@ static int process_sample_event(event_t *event, struct perf_session *session)
         return 0;
 }
 
-static int sample_type_check(struct perf_session *session)
-{
-        if (!(session->sample_type & PERF_SAMPLE_RAW)) {
-                fprintf(stderr,
-                        "No trace sample to read. Did you call perf record "
-                        "without -R?");
-                return -1;
-        }
-
-        return 0;
-}
-
 static struct perf_event_ops event_ops = {
         .process_sample_event   = process_sample_event,
         .process_comm_event     = event__process_comm,
-        .sample_type_check      = sample_type_check,
+        .sample_type_check      = perf_session__has_traces,
 };
 
 static double fragmentation(unsigned long n_req, unsigned long n_alloc)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 80209df6cfe8..d65098c42990 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1653,23 +1653,11 @@ static int process_lost_event(event_t *event __used,
         return 0;
 }
 
-static int sample_type_check(struct perf_session *session __used)
-{
-        if (!(session->sample_type & PERF_SAMPLE_RAW)) {
-                fprintf(stderr,
-                        "No trace sample to read. Did you call perf record "
-                        "without -R?");
-                return -1;
-        }
-
-        return 0;
-}
-
 static struct perf_event_ops event_ops = {
         .process_sample_event   = process_sample_event,
         .process_comm_event     = event__process_comm,
         .process_lost_event     = process_lost_event,
-        .sample_type_check      = sample_type_check,
+        .sample_type_check      = perf_session__has_traces,
 };
 
 static int read_events(void)
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index a589a43112d6..b42f337c17d9 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -1029,23 +1029,12 @@ static void process_samples(struct perf_session *session)
         }
 }
 
-static int sample_type_check(struct perf_session *session)
-{
-        if (!(session->sample_type & PERF_SAMPLE_RAW)) {
-                fprintf(stderr, "No trace samples found in the file.\n"
-                                "Have you used 'perf timechart record' to record it?\n");
-                return -1;
-        }
-
-        return 0;
-}
-
 static struct perf_event_ops event_ops = {
         .process_comm_event     = process_comm_event,
         .process_fork_event     = process_fork_event,
         .process_exit_event     = process_exit_event,
         .process_sample_event   = queue_sample_event,
-        .sample_type_check      = sample_type_check,
+        .sample_type_check      = perf_session__has_traces,
 };
 
 static int __cmd_timechart(void)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 574a215e800b..b0ba2ac37e2c 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -103,22 +103,10 @@ static int process_sample_event(event_t *event, struct perf_session *session)
         return 0;
 }
 
-static int sample_type_check(struct perf_session *session)
-{
-        if (!(session->sample_type & PERF_SAMPLE_RAW)) {
-                fprintf(stderr,
-                        "No trace sample to read. Did you call perf record "
-                        "without -R?");
-                return -1;
-        }
-
-        return 0;
-}
-
 static struct perf_event_ops event_ops = {
         .process_sample_event   = process_sample_event,
         .process_comm_event     = event__process_comm,
-        .sample_type_check      = sample_type_check,
+        .sample_type_check      = perf_session__has_traces,
 };
 
 static int __cmd_trace(struct perf_session *session)
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 736d4fda9272..60eab8b3ff34 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -393,3 +393,14 @@ done:
 out_err:
         return err;
 }
+
+int perf_session__has_traces(struct perf_session *self)
+{
+        if (!(self->sample_type & PERF_SAMPLE_RAW)) {
+                pr_err("No trace sample to read. Did you call perf record "
+                       "without -R?");
+                return -1;
+        }
+
+        return 0;
+}
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 32eaa1bada06..a6951d2f700f 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -56,6 +56,8 @@ struct symbol **perf_session__resolve_callchain(struct perf_session *self,
                                                 struct ip_callchain *chain,
                                                 struct symbol **parent);
 
+int perf_session__has_traces(struct perf_session *self);
+
 int perf_header__read_build_ids(int input, u64 offset, u64 file_size);
 
 #endif /* __PERF_SESSION_H */