1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 7ef899c47c29..be658e33bd26 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1358,6 +1358,17 @@ extern void wait_task_inactive(struct task_struct * p);
 /* de_thread depends on thread_group_leader not being a pid based check */
 #define thread_group_leader(p)  (p == p->group_leader)
 
+/* Do to the insanities of de_thread it is possible for a process
+ * to have the pid of the thread group leader without actually being
+ * the thread group leader.  For iteration through the pids in proc
+ * all we care about is that we have a task with the appropriate
+ * pid, we don't actually care if we have the right task.
+ */
+static inline int has_group_leader_pid(struct task_struct *p)
+{
+        return p->pid == p->tgid;
+}
+
 static inline struct task_struct *next_thread(const struct task_struct *p)
 {
         return list_entry(rcu_dereference(p->thread_group.next),