From: Arnaldo Carvalho de Melo on
From: Arnaldo Carvalho de Melo <acme(a)redhat.com>

It was assuming that the cache was always available and also wasn't
checking if the file found in the build id cache was just a kallsyms
file, that is not supported by objdump for disassembly.

Reported-by: Ingo Molnar <mingo(a)elte.hu>
Cc: Frédéric Weisbecker <fweisbec(a)gmail.com>
Cc: Mike Galbraith <efault(a)gmx.de>
Cc: Paul Mackerras <paulus(a)samba.org>
Cc: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Cc: Stephane Eranian <eranian(a)google.com>
Cc: Tom Zanussi <tzanussi(a)gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme(a)redhat.com>
---
tools/perf/util/hist.c | 13 +++++++++++--
1 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 682a6d8..cbf7eae 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -990,6 +990,7 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head)
struct map *map = self->ms.map;
struct dso *dso = map->dso;
char *filename = dso__build_id_filename(dso, NULL, 0);
+ bool free_filename = true;
char command[PATH_MAX * 2];
FILE *file;
int err = 0;
@@ -1001,11 +1002,19 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head)
sym->name);
return -ENOMEM;
}
+ goto fallback;
+ } else if (readlink(filename, command, sizeof(command)) < 0 ||
+ strstr(command, "[kernel.kallsyms]") ||
+ access(filename, R_OK)) {
+ free(filename);
+fallback:
/*
- * If we don't have build-ids, well, lets hope that this
+ * If we don't have build-ids or the build-id file isn't in the
+ * cache, or is just a kallsyms file, well, lets hope that this
* DSO is the same as when 'perf record' ran.
*/
filename = dso->long_name;
+ free_filename = false;
}

if (dso->origin == DSO__ORIG_KERNEL) {
@@ -1045,7 +1054,7 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head)

pclose(file);
out_free_filename:
- if (dso->has_build_id)
+ if (free_filename)
free(filename);
return err;
}
--
1.6.2.5

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