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-rw-r--r--include/linux/taskstats_kern.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/taskstats_kern.h b/include/linux/taskstats_kern.h
index 0ae8f67..2b6adec 100644
--- a/include/linux/taskstats_kern.h
+++ b/include/linux/taskstats_kern.h
@@ -9,6 +9,7 @@
#include <linux/taskstats.h>
#include <linux/sched.h>
+#include <net/genetlink.h>
enum {
TASKSTATS_MSG_UNICAST, /* send data only to requester */
@@ -19,9 +20,19 @@ enum {
extern kmem_cache_t *taskstats_cache;
extern struct mutex taskstats_exit_mutex;
+static inline int taskstats_has_listeners(void)
+{
+ if (!genl_sock)
+ return 0;
+ return netlink_has_listeners(genl_sock, TASKSTATS_LISTEN_GROUP);
+}
+
+
static inline void taskstats_exit_alloc(struct taskstats **ptidstats)
{
- *ptidstats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
+ *ptidstats = NULL;
+ if (taskstats_has_listeners())
+ *ptidstats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
}
static inline void taskstats_exit_free(struct taskstats *tidstats)
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