sched: Mark parent and real_parent as __rcu
authorKees Cook <keescook@chromium.org>
Wed, 14 Dec 2011 22:39:26 +0000 (14:39 -0800)
committerIngo Molnar <mingo@elte.hu>
Thu, 15 Dec 2011 07:21:59 +0000 (08:21 +0100)
The parent and real_parent pointers should be considered __rcu,
since they should be held under either tasklist_lock or
rcu_read_lock.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/20111214223925.GA27578@www.outflux.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
include/linux/sched.h

index cc8c620..5ef0901 100644 (file)
@@ -1330,8 +1330,8 @@ struct task_struct {
         * older sibling, respectively.  (p->father can be replaced with 
         * p->real_parent->pid)
         */
-       struct task_struct *real_parent; /* real parent process */
-       struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
+       struct task_struct __rcu *real_parent; /* real parent process */
+       struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
        /*
         * children/sibling forms the list of my natural children
         */