[PATCH] posix-timers: use schedule_timeout() in common_nsleep()

common_nsleep() reimplements schedule_timeout_interruptible() for unknown
reason.

Signed-off-by: Oleg Nesterov <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/posix-timers.c

···
 	return error;
 }
 
-static void nanosleep_wake_up(unsigned long __data)
-{
-	struct task_struct *p = (struct task_struct *) __data;
-
-	wake_up_process(p);
-}
-
 /*
  * The standard says that an absolute nanosleep call MUST wake up at
  * the requested time in spite of clock settings.  Here is what we do:
···
 			 int flags, struct timespec *tsave)
 {
 	struct timespec t, dum;
-	struct timer_list new_timer;
 	DECLARE_WAITQUEUE(abs_wqueue, current);
 	u64 rq_time = (u64)0;
 	s64 left;
···
 	    &current_thread_info()->restart_block;
 
 	abs_wqueue.flags = 0;
-	init_timer(&new_timer);
-	new_timer.expires = 0;
-	new_timer.data = (unsigned long) current;
-	new_timer.function = nanosleep_wake_up;
 	abs = flags & TIMER_ABSTIME;
 
 	if (restart_block->fn == clock_nanosleep_restart) {
···
 		if (left < (s64)0)
 			break;
 
-		new_timer.expires = jiffies + left;
-		__set_current_state(TASK_INTERRUPTIBLE);
-		add_timer(&new_timer);
+		schedule_timeout_interruptible(left);
 
-		schedule();
-
-		del_timer_sync(&new_timer);
 		left = rq_time - get_jiffies_64();
 	} while (left > (s64)0 && !test_thread_flag(TIF_SIGPENDING));