perf annotate: Make it to be able to skip unannotatable symbols

Add --skip-missing option for skipping symbols that cannot be used for
annotation.  It's the case of kernel symbols that user doesn't have a
vmlinux image file.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1360227734-375-8-git-send-email-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-annotate.txt

@@ -90,6 +90,9 @@ OPTIONS
 --objdump=<path>::
         Path to objdump binary.
 
+--skip-missing::
+	Skip symbols that cannot be annotated.
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-report[1]

tools/perf/builtin-annotate.c

@@ -37,6 +37,7 @@ struct perf_annotate {
 	bool	   force, use_tui, use_stdio, use_gtk;
 	bool	   full_paths;
 	bool	   print_line;
+	bool	   skip_missing;
 	const char *sym_hist_filter;
 	const char *cpu_list;
 	DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
@@ -139,11 +140,21 @@ static void hists__find_annotations(struct hists *self, int evidx,
 		}
 
 		if (use_browser == 2) {
-			hist_entry__gtk_annotate(he, evidx, NULL);
+			int ret;
+
+			ret = hist_entry__gtk_annotate(he, evidx, NULL);
+			if (!ret || !ann->skip_missing)
 				return;
+
+			/* skip missing symbols */
+			nd = rb_next(nd);
 		} else if (use_browser == 1) {
 			key = hist_entry__tui_annotate(he, evidx, NULL);
 			switch (key) {
+			case -1:
+				if (!ann->skip_missing)
+					return;
+				/* fall through */
 			case K_RIGHT:
 				next = rb_next(nd);
 				break;
@@ -288,6 +299,8 @@ int cmd_annotate(int argc, const char **argv, const char *prefix __maybe_unused)
 		    "print matching source lines (may be slow)"),
 	OPT_BOOLEAN('P', "full-paths", &annotate.full_paths,
 		    "Don't shorten the displayed pathnames"),
+	OPT_BOOLEAN(0, "skip-missing", &annotate.skip_missing,
+		    "Skip symbols that cannot be annotated"),
 	OPT_STRING('C', "cpu", &annotate.cpu_list, "cpu", "list of cpus to profile"),
 	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
 		   "Look for files with symbols relative to this directory"),