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

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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@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.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@redhat.com>
This commit is contained in:
Yunlong Song 2015-02-27 18:21:30 +08:00 committed by Arnaldo Carvalho de Melo
parent ed45752061
commit 3ef1e65c82
1 changed files with 2 additions and 1 deletions
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3
tools/perf/util/parse-options.c
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@ -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');