linux-kernel - [PATCH 1/4] perf intel-pt: Fix sync_switch INTEL_PT_SS_NOT

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Date:   Thu, 31 May 2018 13:23:42 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] perf intel-pt: Fix sync_switch INTEL_PT_SS_NOT_TRACING

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@...el.com>
Cc: stable@...r.kernel.org
---
 tools/perf/util/intel-pt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 492986a25ef6..3db7f0ee52a8 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1521,6 +1521,7 @@ 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);
-- 
1.9.1