perf intel-pt: Rationalize intel_pt_sync_switch()'s use of next_tid

Returning 1 from intel_pt_sync_switch() causes the current tid to be
set. That negates the need to keep next_tid anymore. Rationalize the
code to that effect.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190412113830.4126-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 6aaba11..7a70693 100644 (file)
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1859,7 +1859,6 @@ static int intel_pt_sync_switch(struct intel_pt *pt, int cpu, pid_t tid,
 
        switch (ptq->switch_state) {
        case INTEL_PT_SS_NOT_TRACING:
-               ptq->next_tid = -1;
                break;
        case INTEL_PT_SS_UNKNOWN:
        case INTEL_PT_SS_TRACING:
@@ -1879,13 +1878,14 @@ static int intel_pt_sync_switch(struct intel_pt *pt, int cpu, pid_t tid,
                ptq->switch_state = INTEL_PT_SS_TRACING;
                break;
        case INTEL_PT_SS_EXPECTING_SWITCH_IP:
-               ptq->next_tid = tid;
                intel_pt_log("ERROR: cpu %d expecting switch ip\n", cpu);
                break;
        default:
                break;
        }
 
+       ptq->next_tid = -1;
+
        return 1;
 }