This is a note to let you know that I've just added the patch titled
perf intel-pt: Fix sync state when a PSB (synchronization) packet is found
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-intel-pt-fix-sync-state-when-a-psb-synchronization-packet-is-found.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ad106a26aef3a95ac7ca88d033b431661ba346ce Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Fri, 10 Dec 2021 18:22:58 +0200
Subject: perf intel-pt: Fix sync state when a PSB (synchronization) packet is found
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
commit ad106a26aef3a95ac7ca88d033b431661ba346ce upstream.
When syncing, it may be that branch packet generation is not enabled at
that point, in which case there will not immediately be a control-flow
packet, so some packets before a control flow packet turns up, get
ignored. However, the decoder is in sync as soon as a PSB is found, so
the state should be set accordingly.
Fixes: f4aa081949e7b6 ("perf tools: Add Intel PT decoder")
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v5.15+
Link: https://lore.kernel.org/r/20211210162303.2288710-3-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -3607,7 +3607,7 @@ static int intel_pt_sync(struct intel_pt
}
decoder->have_last_ip = true;
- decoder->pkt_state = INTEL_PT_STATE_NO_IP;
+ decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
err = intel_pt_walk_psb(decoder);
if (err)
Patches currently in stable-queue which might be from adrian.hunter@xxxxxxxxx are
queue-5.15/perf-intel-pt-fix-some-pge-packet-generation-enable-control-flow-packets-usage.patch
queue-5.15/perf-intel-pt-fix-intel_pt_fup_event-assumptions-about-setting-state-type.patch
queue-5.15/perf-intel-pt-fix-next-err-value-walking-trace.patch
queue-5.15/perf-intel-pt-fix-error-timestamp-setting-on-the-decoder-error-path.patch
queue-5.15/perf-intel-pt-fix-state-setting-when-receiving-overflow-ovf-packet.patch
queue-5.15/perf-intel-pt-fix-sync-state-when-a-psb-synchronization-packet-is-found.patch
queue-5.15/perf-intel-pt-fix-missing-instruction-events-with-q-option.patch
