linux-kernel - [PATCH] perf script: Fix error when printing 'weight' field

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Date:   Mon, 21 Feb 2022 17:17:06 +0000
From:   German Gomez <german.gomez@....com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org
Cc:     German Gomez <german.gomez@....com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH] perf script: Fix error when printing 'weight' field

In SPE traces the 'weight' field can't be printed in perf-script because
the 'dummy:u' event doesn't have the WEIGHT attribute set.

Use evsel__do_check_stype(..) to check this field, as it's done with
other fields such as "phys_addr".

Before:

$ perf record -e arm_spe_0// -- sleep 1
$ perf script -F event,ip,weight
Samples for 'dummy:u' event do not have WEIGHT attribute set. Cannot print 'weight' field.

After:

$ perf script -F event,ip,weight
   l1d-access:               12 ffffaf629d4cb320
   tlb-access:               12 ffffaf629d4cb320
       memory:               12 ffffaf629d4cb320

Fixes: b0fde9c6e291 ("perf arm-spe: Add SPE total latency as PERF_SAMPLE_WEIGHT")
Signed-off-by: German Gomez <german.gomez@....com>
---
 tools/perf/builtin-script.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 9e032343f..6ce581067 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -463,7 +463,7 @@ static int evsel__check_attr(struct evsel *evsel, struct perf_session *session)
 		return -EINVAL;
 
 	if (PRINT_FIELD(WEIGHT) &&
-	    evsel__check_stype(evsel, PERF_SAMPLE_WEIGHT_TYPE, "WEIGHT", PERF_OUTPUT_WEIGHT))
+	    evsel__do_check_stype(evsel, PERF_SAMPLE_WEIGHT_TYPE, "WEIGHT", PERF_OUTPUT_WEIGHT, allow_user_set))
 		return -EINVAL;
 
 	if (PRINT_FIELD(SYM) &&
-- 
2.25.1