perf tools: Add machine__module_dso function

Separate the dso object addition and update when adding new kernel
module.

Currently we update dso's symtab_type any time we find it in the list,
because we can't distinguish between new and found dso from
__dsos__findnew function.

Adding machine__module_dso that separates finding and adding new dso
objects, so there's no superfluous update of dso.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-uvqgs5tyq4wssnq6fm43hgvk@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/machine.c

@@ -460,20 +460,17 @@ int machine__process_lost_event(struct machine *machine __maybe_unused,
 	return 0;
 }
 
-struct map *machine__new_module(struct machine *machine, u64 start,
-				const char *filename)
+static struct dso *machine__module_dso(struct machine *machine, const char *filename)
 {
-	struct map *map;
-	struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
+	struct dso *dso;
 	bool compressed;
 
+	dso = dsos__find(&machine->kernel_dsos, filename, false);
+	if (!dso) {
+		dso = dsos__addnew(&machine->kernel_dsos, filename);
 		if (dso == NULL)
 			return NULL;
 
-	map = map__new2(start, dso, MAP__FUNCTION);
-	if (map == NULL)
-		return NULL;
-
 		if (machine__is_host(machine))
 			dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
 		else
@@ -482,6 +479,23 @@ struct map *machine__new_module(struct machine *machine, u64 start,
 		/* _KMODULE_COMP should be next to _KMODULE */
 		if (is_kernel_module(filename, &compressed) && compressed)
 			dso->symtab_type++;
+	}
+
+	return dso;
+}
+
+struct map *machine__new_module(struct machine *machine, u64 start,
+				const char *filename)
+{
+	struct map *map;
+	struct dso *dso = machine__module_dso(machine, filename);
+
+	if (dso == NULL)
+		return NULL;
+
+	map = map__new2(start, dso, MAP__FUNCTION);
+	if (map == NULL)
+		return NULL;
 
 	map_groups__insert(&machine->kmaps, map);
 	return map;