perf intel-pt: Fix sync_switch INTEL_PT_SS_NOT_TRACING

commit dbcb82b93f3e8322891e47472c89e63058b81e99 upstream.

sync_switch is a facility to synchronize decoding more closely with the
point in the kernel when the context actually switched.

In one case, INTEL_PT_SS_NOT_TRACING state was not correctly
transitioning to INTEL_PT_SS_TRACING state due to a missing case clause.
Add it.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1527762225-26024-2-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index d9573c1fa555d0316290301b5c114f465ad64f3e..a39fc1200e2d9a0cacb0c4b737d533a61ad1b35b 100644 (file)
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1560,6 +1560,7 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
 
        if (intel_pt_is_switch_ip(ptq, state->to_ip)) {
                switch (ptq->switch_state) {
+               case INTEL_PT_SS_NOT_TRACING:
                case INTEL_PT_SS_UNKNOWN:
                case INTEL_PT_SS_EXPECTING_SWITCH_IP:
                        err = intel_pt_next_tid(pt, ptq);