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.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/machine.c

@@ -460,12 +460,35 @@ int machine__process_lost_event(struct machine *machine __maybe_unused,
 	return 0;
 }
 
+static struct dso *machine__module_dso(struct machine *machine, const char *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;
+
+		if (machine__is_host(machine))
+			dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
+		else
+			dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
+
+		/* _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 = __dsos__findnew(&machine->kernel_dsos, filename);
-	bool compressed;
+	struct dso *dso = machine__module_dso(machine, filename);
 
 	if (dso == NULL)
 		return NULL;
@@ -474,15 +497,6 @@ struct map *machine__new_module(struct machine *machine, u64 start,
 	if (map == NULL)
 		return NULL;
 
-	if (machine__is_host(machine))
-		dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
-	else
-		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
-
-	/* _KMODULE_COMP should be next to _KMODULE */
-	if (is_kernel_module(filename, &compressed) && compressed)
-		dso->symtab_type++;
-
 	map_groups__insert(&machine->kmaps, map);
 	return map;
 }