+#define MODINFO_ATTR(field) \
+static void setup_modinfo_##field(struct module *mod, const char *s) \
+{ \
+ mod->field = kstrdup(s, GFP_KERNEL); \
+} \
+static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
+ struct module *mod, char *buffer) \
+{ \
+ return sprintf(buffer, "%s\n", mod->field); \
+} \
+static int modinfo_##field##_exists(struct module *mod) \
+{ \
+ return mod->field != NULL; \
+} \
+static void free_modinfo_##field(struct module *mod) \
+{ \
+ kfree(mod->field); \
+ mod->field = NULL; \
+} \
+static struct module_attribute modinfo_##field = { \
+ .attr = { .name = __stringify(field), .mode = 0444, \
+ .owner = THIS_MODULE }, \
+ .show = show_modinfo_##field, \
+ .setup = setup_modinfo_##field, \
+ .test = modinfo_##field##_exists, \
+ .free = free_modinfo_##field, \
+};
+
+MODINFO_ATTR(version);
+MODINFO_ATTR(srcversion);
+
+static struct module_attribute *modinfo_attrs[] = {
+ &modinfo_version,
+ &modinfo_srcversion,
+ NULL,
+};
+