Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck...

[firefly-linux-kernel-4.4.55.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 7fa8c4d372e7d2eb547a7580932d1b7d661535a2..aec904bc3da9b10aa4d69bece034b77aed3b5e1f 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -762,6 +762,18 @@ struct signal_struct {
        unsigned audit_tty_log_passwd;
        struct tty_audit_buf *tty_audit_buf;
 #endif
+#ifdef CONFIG_CGROUPS
+       /*
+        * group_rwsem prevents new tasks from entering the threadgroup and
+        * member tasks from exiting,a more specifically, setting of
+        * PF_EXITING.  fork and exit paths are protected with this rwsem
+        * using threadgroup_change_begin/end().  Users which require
+        * threadgroup to remain stable should use threadgroup_[un]lock()
+        * which also takes care of exec path.  Currently, cgroup is the
+        * only user.
+        */
+       struct rw_semaphore group_rwsem;
+#endif
 
        oom_flags_t oom_flags;
        short oom_score_adj;            /* OOM kill score adjustment */