posix-cpu-timers: Remove cputime_expires

The last users of the magic struct cputime based expiry cache are
gone. Remove the leftovers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192921.790209622@linutronix.de

include/linux/posix-timers.h

@@ -65,19 +65,14 @@ static inline int clockid_to_fd(const clockid_t clk)
 #ifdef CONFIG_POSIX_TIMERS
 /**
  * posix_cputimers - Container for posix CPU timer related data
- * @cputime_expires:	Earliest-expiration cache task_cputime based
  * @expiries:		Earliest-expiration cache array based
  * @cpu_timers:		List heads to queue posix CPU timers
  *
  * Used in task_struct and signal_struct
  */
 struct posix_cputimers {
-	/* Temporary union until all users are cleaned up */
-	union {
-		struct task_cputime	cputime_expires;
-		u64			expiries[CPUCLOCK_MAX];
-	};
-	struct list_head		cpu_timers[CPUCLOCK_MAX];
+	u64			expiries[CPUCLOCK_MAX];
+	struct list_head	cpu_timers[CPUCLOCK_MAX];
 };
 
 static inline void posix_cputimers_init(struct posix_cputimers *pct)

kernel/time/posix-cpu-timers.c

@@ -18,16 +18,6 @@
 
 #include "posix-timers.h"
 
-static inline void temporary_check(void)
-{
-	BUILD_BUG_ON(offsetof(struct task_cputime, stime) !=
-		     CPUCLOCK_PROF * sizeof(u64));
-	BUILD_BUG_ON(offsetof(struct task_cputime, utime) !=
-		     CPUCLOCK_VIRT * sizeof(u64));
-	BUILD_BUG_ON(offsetof(struct task_cputime, sum_exec_runtime) !=
-		     CPUCLOCK_SCHED * sizeof(u64));
-}
-
 static void posix_cpu_timer_rearm(struct k_itimer *timer);
 
 void posix_cputimers_group_init(struct posix_cputimers *pct, u64 cpu_limit)