1 files changed, 12 insertions, 4 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 51d1fe3fb7ad..b6c90b5ef509 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -48,6 +48,7 @@
 #include <linux/tracehook.h>
 #include <linux/fs_struct.h>
 #include <linux/init_task.h>
+#include <linux/perf_counter.h>
 #include <trace/events/sched.h>
 
 #include <asm/uaccess.h>
@@ -154,6 +155,9 @@ static void delayed_put_task_struct(struct rcu_head *rhp)
 {
         struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
 
+#ifdef CONFIG_PERF_COUNTERS
+        WARN_ON_ONCE(tsk->perf_counter_ctxp);
+#endif
         trace_sched_process_free(tsk);
         put_task_struct(tsk);
 }
@@ -170,6 +174,7 @@ repeat:
         atomic_dec(&__task_cred(p)->user->processes);
 
         proc_flush_task(p);
+
         write_lock_irq(&tasklist_lock);
         tracehook_finish_release_task(p);
         __exit_signal(p);
@@ -971,16 +976,19 @@ NORET_TYPE void do_exit(long code)
                 module_put(tsk->binfmt->module);
 
         proc_exit_connector(tsk);
+
+        /*
+         * Flush inherited counters to the parent - before the parent
+         * gets woken up by child-exit notifications.
+         */
+        perf_counter_exit_task(tsk);
+
         exit_notify(tsk, group_dead);
 #ifdef CONFIG_NUMA
         mpol_put(tsk->mempolicy);
         tsk->mempolicy = NULL;
 #endif
 #ifdef CONFIG_FUTEX
-        /*
-         * This must happen late, after the PID is not
-         * hashed anymore:
-         */
         if (unlikely(!list_empty(&tsk->pi_state_list)))
                 exit_pi_state_list(tsk);
         if (unlikely(current->pi_state_cache))