time, signal: Protect resource use statistics with seqlock

[mirror_ubuntu-zesty-kernel.git] / kernel / time / posix-cpu-timers.c

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 3b8946416a5f836227edcf0db8dd1f8b2eb95063..492b986195d53350abe899b0ecd059f91edb77a4 100644 (file)
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -272,22 +272,8 @@ static int posix_cpu_clock_get_task(struct task_struct *tsk,
                if (same_thread_group(tsk, current))
                        err = cpu_clock_sample(which_clock, tsk, &rtn);
        } else {
-               unsigned long flags;
-               struct sighand_struct *sighand;
-
-               /*
-                * while_each_thread() is not yet entirely RCU safe,
-                * keep locking the group while sampling process
-                * clock for now.
-                */
-               sighand = lock_task_sighand(tsk, &flags);
-               if (!sighand)
-                       return err;
-
                if (tsk == current || thread_group_leader(tsk))
                        err = cpu_clock_sample_group(which_clock, tsk, &rtn);
-
-               unlock_task_sighand(tsk, &flags);
        }
 
        if (!err)