linux-kernel - [tip:perf/core] perf tools: Remove the '--(null)' long

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Message-ID: <tip-3ef1e65c829c86ffaa94a4ed59fed5da37f9610a@git.kernel.org>
Date:	Sat, 28 Feb 2015 01:33:46 -0800
From:	tip-bot for Yunlong Song <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	wangnan0@...wei.com, linux-kernel@...r.kernel.org,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, hpa@...or.com,
	yunlong.song@...wei.com, tglx@...utronix.de, acme@...hat.com,
	paulus@...ba.org
Subject: [tip:perf/core] perf tools: Remove the '--(null)'
  long_name for --list-opts

Commit-ID:  3ef1e65c829c86ffaa94a4ed59fed5da37f9610a
Gitweb:     http://git.kernel.org/tip/3ef1e65c829c86ffaa94a4ed59fed5da37f9610a
Author:     Yunlong Song <yunlong.song@...wei.com>
AuthorDate: Fri, 27 Feb 2015 18:21:30 +0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 27 Feb 2015 15:52:14 -0300

perf tools: Remove the '--(null)' long_name for --list-opts

If the long_name of a 'struct option' is defined as NULL, --list-opts
will incorrectly print '--(null)' in its output. As a result, '--(null)'
will finally appear in the case of bash completion, e.g. 'perf record
--'.

Example:

Before this patch:

 $ perf record --list-opts

 --event --filter --pid --tid --realtime --no-buffering --raw-samples
 --all-cpus --cpu --count --output --no-inherit --freq --mmap-pages
 --group --(null) --call-graph --verbose --quiet --stat --data
 --timestamp --period --no-samples --no-buildid-cache --no-buildid
 --cgroup --delay --uid --branch-any --branch-filter --weight
 --transaction --per-thread --intr-regs

After this patch:

 $ perf record --list-opts

 --event --filter --pid --tid --realtime --no-buffering --raw-samples
 --all-cpus --cpu --count --output --no-inherit --freq --mmap-pages
 --group --call-graph --verbose --quiet --stat --data --timestamp
 --period --no-samples --no-buildid-cache --no-buildid --cgroup --delay
 --uid --branch-any --branch-filter --weight --transaction --per-thread
 --intr-regs

Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/1425032491-20224-7-git-send-email-yunlong.song@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/parse-options.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
index b0ef2d8..1457d66 100644
--- a/tools/perf/util/parse-options.c
+++ b/tools/perf/util/parse-options.c
@@ -505,7 +505,8 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
 		break;
 	case PARSE_OPT_LIST_OPTS:
 		while (options->type != OPTION_END) {
-			printf("--%s ", options->long_name);
+			if (options->long_name)
+				printf("--%s ", options->long_name);
 			options++;
 		}
 		putchar('\n');
--
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