perf tools: Add missing newline when parsing empty BPF proggie
This is not specific to BPF but was found when parsing a .c BPF proggie that while valid, had no events attached to tracepoints, kprobes, etc: Very minimal file that perf's BPF code can compile: # cat empty.c char _license[] __attribute__((section("license"), used)) = "GPL"; int _version __attribute__((section("version"), used)) = LINUX_VERSION_CODE; # Before this patch: # perf trace -e empty.c WARNING: event parser found nothinginvalid or unsupported event: 'empty.c' Run 'perf list' for a list of valid events Usage: perf trace [<options>] [<command>] or: perf trace [<options>] -- <command> [<options>] or: perf trace record [<options>] [<command>] or: perf trace record [<options>] -- <command> [<options>] -e, --event <event> event/syscall selector. use 'perf list' to list available events # After: # perf trace -e empty.c WARNING: event parser found nothing invalid or unsupported event: 'empty.c' Run 'perf list' for a list of valid events Usage: perf trace [<options>] [<command>] or: perf trace [<options>] -- <command> [<options>] or: perf trace record [<options>] [<command>] or: perf trace record [<options>] -- <command> [<options>] -e, --event <event> event/syscall selector. use 'perf list' to list available events # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-8ysughiz00h6mjpcot04qyjj@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -1715,7 +1715,7 @@ int parse_events(struct perf_evlist *evlist, const char *str,
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struct perf_evsel *last;
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struct perf_evsel *last;
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if (list_empty(&parse_state.list)) {
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if (list_empty(&parse_state.list)) {
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WARN_ONCE(true, "WARNING: event parser found nothing");
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WARN_ONCE(true, "WARNING: event parser found nothing\n");
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return -1;
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return -1;
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}
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}
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