linux-kernel - [PATCH v4] perf list: Fix the --no-desc option

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Date: Fri, 17 May 2024 07:14:26 -0700
From: Breno Leitao <leitao@...ian.org>
To: irogers@...gle.com,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>
Cc: leit@...a.com,
	linux-perf-users@...r.kernel.org (open list:PERFORMANCE EVENTS SUBSYSTEM),
	linux-kernel@...r.kernel.org (open list:PERFORMANCE EVENTS SUBSYSTEM)
Subject: [PATCH v4] perf list: Fix the --no-desc option

Currently, the --no-desc option in perf list isn't functioning as
intended.

This issue arises from the overwriting of struct option->desc with the
opposite value of struct option->long_desc. Consequently, whatever
parse_options() returns at struct option->desc gets overridden later,
rendering the --desc or --no-desc arguments ineffective.

To resolve this, set ->desc as true by default and allow parse_options()
to adjust it accordingly. This adjustment will fix the --no-desc
option while preserving the functionality of the other parameters.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
Changelog:

v4:
	* Revert the change in json_print_event() from v3.
v3:
       	* Applied the same logic to default_print_metric() and
          json_print_event() functions, as identified by Ian Rogers.
v2:
       	* Do not print desc if long_desc is being printed, as identified
          by Ian Rogers.
---
 tools/perf/builtin-list.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 02bf608d585e..24a136ea015e 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -149,7 +149,11 @@ static void default_print_event(void *ps, const char *pmu_name, const char *topi
 	} else
 		fputc('\n', fp);
 
-	if (desc && print_state->desc) {
+	if (long_desc && print_state->long_desc) {
+		fprintf(fp, "%*s", 8, "[");
+		wordwrap(fp, long_desc, 8, pager_get_columns(), 0);
+		fprintf(fp, "]\n");
+	} else if (desc && print_state->desc) {
 		char *desc_with_unit = NULL;
 		int desc_len = -1;
 
@@ -165,12 +169,6 @@ static void default_print_event(void *ps, const char *pmu_name, const char *topi
 		fprintf(fp, "]\n");
 		free(desc_with_unit);
 	}
-	long_desc = long_desc ?: desc;
-	if (long_desc && print_state->long_desc) {
-		fprintf(fp, "%*s", 8, "[");
-		wordwrap(fp, long_desc, 8, pager_get_columns(), 0);
-		fprintf(fp, "]\n");
-	}
 
 	if (print_state->detailed && encoding_desc) {
 		fprintf(fp, "%*s", 8, "");
@@ -243,15 +241,14 @@ static void default_print_metric(void *ps,
 	}
 	fprintf(fp, "  %s\n", name);
 
-	if (desc && print_state->desc) {
-		fprintf(fp, "%*s", 8, "[");
-		wordwrap(fp, desc, 8, pager_get_columns(), 0);
-		fprintf(fp, "]\n");
-	}
 	if (long_desc && print_state->long_desc) {
 		fprintf(fp, "%*s", 8, "[");
 		wordwrap(fp, long_desc, 8, pager_get_columns(), 0);
 		fprintf(fp, "]\n");
+	} else if (desc && print_state->desc) {
+		fprintf(fp, "%*s", 8, "[");
+		wordwrap(fp, desc, 8, pager_get_columns(), 0);
+		fprintf(fp, "]\n");
 	}
 	if (expr && print_state->detailed) {
 		fprintf(fp, "%*s", 8, "[");
@@ -491,6 +488,7 @@ int cmd_list(int argc, const char **argv)
 	int i, ret = 0;
 	struct print_state default_ps = {
 		.fp = stdout,
+		.desc = true,
 	};
 	struct print_state json_ps = {
 		.fp = stdout,
@@ -563,7 +561,6 @@ int cmd_list(int argc, const char **argv)
 		};
 		ps = &json_ps;
 	} else {
-		default_ps.desc = !default_ps.long_desc;
 		default_ps.last_topic = strdup("");
 		assert(default_ps.last_topic);
 		default_ps.visited_metrics = strlist__new(NULL, NULL);
-- 
2.43.0