perf cs-etm: Don't check cs_etm_queue::prev_packet validity

Since cs_etm_queue::prev_packet is allocated for all cases, it will
never be NULL pointer; now validity checking prev_packet is pointless,
remove all of them.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Suzuki K Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20190428083228.20246-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 1108049..7777cfc 100644 (file)
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -981,7 +981,6 @@ static int cs_etm__sample(struct cs_etm_queue *etmq)
         * PREV_PACKET is a branch.
         */
        if (etm->synth_opts.last_branch &&
-           etmq->prev_packet &&
            etmq->prev_packet->sample_type == CS_ETM_RANGE &&
            etmq->prev_packet->last_instr_taken_branch)
                cs_etm__update_last_branch_rb(etmq);
@@ -1014,7 +1013,7 @@ static int cs_etm__sample(struct cs_etm_queue *etmq)
                etmq->period_instructions = instrs_over;
        }
 
-       if (etm->sample_branches && etmq->prev_packet) {
+       if (etm->sample_branches) {
                bool generate_sample = false;
 
                /* Generate sample for tracing on packet */
@@ -1071,9 +1070,6 @@ static int cs_etm__flush(struct cs_etm_queue *etmq)
        struct cs_etm_auxtrace *etm = etmq->etm;
        struct cs_etm_packet *tmp;
 
-       if (!etmq->prev_packet)
-               return 0;
-
        /* Handle start tracing packet */
        if (etmq->prev_packet->sample_type == CS_ETM_EMPTY)
                goto swap_packet;