Commit-ID: bdde37163e1fd474509aab90f5eaacee46100107 Gitweb: http://git.kernel.org/tip/bdde37163e1fd474509aab90f5eaacee46100107 Author: Jiri Olsa <[email protected]> AuthorDate: Mon, 10 Sep 2012 18:50:16 +0200 Committer: Arnaldo Carvalho de Melo <[email protected]> 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 <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- 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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
