From eb4717f733b5941a29ea4e0aec3227a0e0770487 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Sun, 4 Jul 2021 00:35:18 +0900 Subject: [PATCH] perf probe: Fix debuginfo__new() to enable build-id based debuginfo Fix debuginfo__new() to set the build-id to dso before dso__read_binary_type_filename() so that it can find DSO_BINARY_TYPE__BUILDID_DEBUGINFO debuginfo correctly. However, this may not change the result, because elfutils (libdwfl) has its own debuginfo finder. With/without this patch, the perf probe correctly find the debuginfo file. This is just a failsafe and keep code's sanity (if you use dso__read_binary_type_filename(), you must set the build-id to the dso.) Reported-by: Thomas Richter Acked-by: Thomas Richter Signed-off-by: Masami Hiramatsu Cc: Heiko Carstens Cc: Stefan Liebler Cc: Sven Schnelle Link: http://lore.kernel.org/lkml/162532651863.393143.11692691321219235810.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-finder.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index b029c29ce227..02ef0d78053b 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -118,12 +118,17 @@ struct debuginfo *debuginfo__new(const char *path) char buf[PATH_MAX], nil = '\0'; struct dso *dso; struct debuginfo *dinfo = NULL; + struct build_id bid; /* Try to open distro debuginfo files */ dso = dso__new(path); if (!dso) goto out; + /* Set the build id for DSO_BINARY_TYPE__BUILDID_DEBUGINFO */ + if (is_regular_file(path) && filename__read_build_id(path, &bid) > 0) + dso__set_build_id(dso, &bid); + for (type = distro_dwarf_types; !dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND; type++) {