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Subject[PATCH 1/3] perf-probe: Fix debuginfo__new() to enable build-id based debuginfo
Date
From: Masami Hiramatsu <mhriamat@kernel.org>

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 <tmricht@linux.ibm.com>
Signed-off-by: Masami Hiramatsu <mhriamat@kernel.org>
---
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++) {
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