This is a note to let you know that I've just added the patch titled
perf intel-pt: Use FUP always when scanning for an IP
to the 4.4-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-use-fup-always-when-scanning-for-an-ip.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 622b7a47b843c78626f40c1d1aeef8483383fba2 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Fri, 26 May 2017 11:17:08 +0300
Subject: perf intel-pt: Use FUP always when scanning for an IP
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
commit 622b7a47b843c78626f40c1d1aeef8483383fba2 upstream.
The decoder will try to use branch packets to find an IP to start decoding
or to recover from errors. Currently the FUP packet is used only in the
case of an overflow, however there is no reason for that to be a special
case. So just use FUP always when scanning for an IP.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1495786658-18063-8-git-send-email-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 | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1848,14 +1848,10 @@ static int intel_pt_walk_to_ip(struct in
break;
case INTEL_PT_FUP:
- if (decoder->overflow) {
- if (intel_pt_have_ip(decoder))
- intel_pt_set_ip(decoder);
- if (decoder->ip)
- return 0;
- }
- if (decoder->packet.count && decoder->have_last_ip)
- intel_pt_set_last_ip(decoder);
+ if (intel_pt_have_ip(decoder))
+ intel_pt_set_ip(decoder);
+ if (decoder->ip)
+ return 0;
break;
case INTEL_PT_MTC:
Patches currently in stable-queue which might be from adrian.hunter@xxxxxxxxx are
queue-4.4/perf-intel-pt-ensure-never-to-set-last_ip-when-packet-count-is-zero.patch
queue-4.4/perf-intel-pt-use-fup-always-when-scanning-for-an-ip.patch
queue-4.4/perf-intel-pt-fix-last_ip-usage.patch
queue-4.4/perf-intel-pt-fix-ip-compression.patch