1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index ffccdad050b5..485234d2fd42 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -549,6 +549,7 @@ struct signal_struct {
         atomic_t                sigcnt;
         atomic_t                live;
         int                     nr_threads;
+        struct list_head        thread_head;
 
         wait_queue_head_t       wait_chldexit;  /* for wait4() */
 
@@ -1271,6 +1272,7 @@ struct task_struct {
         /* PID/PID hash table linkage. */
         struct pid_link pids[PIDTYPE_MAX];
         struct list_head thread_group;
+        struct list_head thread_node;
 
         struct completion *vfork_done;          /* for vfork() */
         int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
@@ -2341,6 +2343,16 @@ extern bool current_is_single_threaded(void);
 #define while_each_thread(g, t) \
         while ((t = next_thread(t)) != g)
 
+#define __for_each_thread(signal, t)    \
+        list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
+
+#define for_each_thread(p, t)           \
+        __for_each_thread((p)->signal, t)
+
+/* Careful: this is a double loop, 'break' won't work as expected. */
+#define for_each_process_thread(p, t)   \
+        for_each_process(p) for_each_thread(p, t)
+
 static inline int get_nr_threads(struct task_struct *tsk)
 {
         return tsk->signal->nr_threads;