perf tools: Save failed result of get_srcline()

Some dso's lack srcline info, so there's no point to keep trying on
them.  Just save failture status and skip them.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1378876173-13363-8-git-send-email-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/dso.c

@@ -450,6 +450,7 @@ struct dso *dso__new(const char *name)
 		dso->rel = 0;
 		dso->sorted_by_name = 0;
 		dso->has_build_id = 0;
+		dso->has_srcline = 1;
 		dso->kernel = DSO_TYPE_USER;
 		dso->needs_swap = DSO_SWAP__UNSET;
 		INIT_LIST_HEAD(&dso->node);

tools/perf/util/dso.h

@@ -83,6 +83,7 @@ struct dso {
 	enum dso_binary_type	data_type;
 	u8		 adjust_symbols:1;
 	u8		 has_build_id:1;
+	u8		 has_srcline:1;
 	u8		 hit:1;
 	u8		 annotate_warned:1;
 	u8		 sname_alloc:1;

tools/perf/util/srcline.c

@@ -58,10 +58,13 @@ char *get_srcline(struct dso *dso, unsigned long addr)
 {
 	char *file;
 	unsigned line;
-	char *srcline = SRCLINE_UNKNOWN;
+	char *srcline;
 	char *dso_name = dso->long_name;
 	size_t size;
 
+	if (!dso->has_srcline)
+		return SRCLINE_UNKNOWN;
+
 	if (dso_name[0] == '[')
 		goto out;
 
@@ -81,8 +84,11 @@ char *get_srcline(struct dso *dso, unsigned long addr)
 		srcline = SRCLINE_UNKNOWN;
 
 	free(file);
-out:
 	return srcline;
+
+out:
+	dso->has_srcline = 0;
+	return SRCLINE_UNKNOWN;
 }
 
 void free_srcline(char *srcline)