perf top: Do show usage message when failing to create cpu/thread maps

This is necessary to get rid of the browser dependency from
usage_with_options() and its friends.  Because we validate the targets
which are used to create the cpu/thread maps and inform the user about
any override performed via the chosen UI, we don't need to call the
usage routine for that.

Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-slu7lj7buzpwgop1vo9la8ma@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 7e2e72e..84fd636 100644 (file)
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1279,8 +1279,11 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
        if (target__none(target))
                target->system_wide = true;
 
-       if (perf_evlist__create_maps(top.evlist, target) < 0)
-               usage_with_options(top_usage, options);
+       if (perf_evlist__create_maps(top.evlist, target) < 0) {
+               ui__error("Couldn't create thread/CPU maps: %s\n",
+                         errno == ENOENT ? "No such process" : strerror_r(errno, errbuf, sizeof(errbuf)));
+               goto out_delete_evlist;
+       }
 
        if (!top.evlist->nr_entries &&
            perf_evlist__add_default(top.evlist) < 0) {