linux-kernel - [PATCH] perf trace: Show zero value in STRARRAY

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Message-ID: <20250502204056.973977-1-namhyung@kernel.org>
Date: Fri,  2 May 2025 13:40:56 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org,
	Howard Chu <howardchu95@...il.com>
Subject: [PATCH] perf trace: Show zero value in STRARRAY

The STRARRAY macro is to print values in a pre-defined array.  But
sometimes it hides the value because it's 0.  The value of 0 can have a
meaning in this case so set 'show_zero' field.

For example, it can show CREATE_MAP cmd in the bpf syscall.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-trace.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 83c62c30d914306c..9210ba34002b13c3 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1123,12 +1123,14 @@ static bool syscall_arg__strtoul_btf_type(char *bf __maybe_unused, size_t size _
 #define STRARRAY(name, array) \
 	  { .scnprintf	= SCA_STRARRAY, \
 	    .strtoul	= STUL_STRARRAY, \
-	    .parm	= &strarray__##array, }
+	    .parm	= &strarray__##array, \
+	    .show_zero	= true, }
 
 #define STRARRAY_FLAGS(name, array) \
 	  { .scnprintf	= SCA_STRARRAY_FLAGS, \
 	    .strtoul	= STUL_STRARRAY_FLAGS, \
-	    .parm	= &strarray__##array, }
+	    .parm	= &strarray__##array, \
+	    .show_zero	= true, }
 
 #include "trace/beauty/eventfd.c"
 #include "trace/beauty/futex_op.c"
-- 
2.49.0.906.g1f30a19c02-goog