4.4-stable review patch. If anyone has any objections, please let me know.
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From: Adrian Hunter adrian.hunter@intel.com
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@int... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- tools/perf/util/intel-pt.c | 1 + 1 file changed, 1 insertion(+)
--- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -1246,6 +1246,7 @@ static int intel_pt_sample(struct intel_
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);