perf symbols: Add '.note' check into search for NOTE section

Adding '.note' section name to be check when looking for notes section.
The '.note' name is used by kernel VDSO.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Ulrich Drepper <drepper@gmail.com>
Link: http://lkml.kernel.org/r/1340120894-9465-15-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 994f4ffdcd055f026149aef6186eb106fa2952da..50958bbeb26aa0c0d19f92deb830649cd43d5100 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1478,14 +1478,31 @@ static int elf_read_build_id(Elf *elf, void *bf, size_t size)
                goto out;
        }
 
-       sec = elf_section_by_name(elf, &ehdr, &shdr,
-                                 ".note.gnu.build-id", NULL);
-       if (sec == NULL) {
+       /*
+        * Check following sections for notes:
+        *   '.note.gnu.build-id'
+        *   '.notes'
+        *   '.note' (VDSO specific)
+        */
+       do {
+               sec = elf_section_by_name(elf, &ehdr, &shdr,
+                                         ".note.gnu.build-id", NULL);
+               if (sec)
+                       break;
+
                sec = elf_section_by_name(elf, &ehdr, &shdr,
                                          ".notes", NULL);
-               if (sec == NULL)
-                       goto out;
-       }
+               if (sec)
+                       break;
+
+               sec = elf_section_by_name(elf, &ehdr, &shdr,
+                                         ".note", NULL);
+               if (sec)
+                       break;
+
+               return err;
+
+       } while (0);
 
        data = elf_getdata(sec, NULL);
        if (data == NULL)