Commit-ID: bdde37163e1fd474509aab90f5eaacee46100107 Gitweb: http://git.kernel.org/tip/bdde37163e1fd474509aab90f5eaacee46100107 Author: Jiri Olsa <jo...@redhat.com> AuthorDate: Mon, 10 Sep 2012 18:50:16 +0200 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Tue, 11 Sep 2012 12:01:15 -0300
perf tools: Do backtrace post unwind only if we regs and stack were captured Bail out without error if we want to do backtrace post unwind, but were not able to capture user registers or user stack during the record phase, which is possible and valid case. Signed-off-by: Jiri Olsa <jo...@redhat.com> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: Paul Mackerras <pau...@samba.org> Cc: Peter Zijlstra <a.p.zijls...@chello.nl> Link: http://lkml.kernel.org/r/1347295819-23177-2-git-send-email-jo...@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/util/session.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 3806ea4..0ecd62b 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -388,6 +388,11 @@ int machine__resolve_callchain(struct machine *machine, (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER))) return 0; + /* Bail out if nothing was captured. */ + if ((!sample->user_regs.regs) || + (!sample->user_stack.size)) + return 0; + return unwind__get_entries(unwind_entry, &callchain_cursor, machine, thread, evsel->attr.sample_regs_user, sample); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
