sched/idle: Remove TS_POLLING support

Now that there are no architectures left using it, kill the support
for TS_POLLING.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/n/tip-6yurip2tfix2f4bfc5agu2s0@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/linux/sched.h

@@ -2775,51 +2775,9 @@ static inline int spin_needbreak(spinlock_t *lock)
 
 /*
  * Idle thread specific functions to determine the need_resched
- * polling state. We have two versions, one based on TS_POLLING in
- * thread_info.status and one based on TIF_POLLING_NRFLAG in
- * thread_info.flags
+ * polling state.
  */
-#ifdef TS_POLLING
-static inline int tsk_is_polling(struct task_struct *p)
-{
-	return task_thread_info(p)->status & TS_POLLING;
-}
-static inline void __current_set_polling(void)
-{
-	current_thread_info()->status |= TS_POLLING;
-}
-
-static inline bool __must_check current_set_polling_and_test(void)
-{
-	__current_set_polling();
-
-	/*
-	 * Polling state must be visible before we test NEED_RESCHED,
-	 * paired by resched_task()
-	 */
-	smp_mb();
-
-	return unlikely(tif_need_resched());
-}
-
-static inline void __current_clr_polling(void)
-{
-	current_thread_info()->status &= ~TS_POLLING;
-}
-
-static inline bool __must_check current_clr_polling_and_test(void)
-{
-	__current_clr_polling();
-
-	/*
-	 * Polling state must be visible before we test NEED_RESCHED,
-	 * paired by resched_task()
-	 */
-	smp_mb();
-
-	return unlikely(tif_need_resched());
-}
-#elif defined(TIF_POLLING_NRFLAG)
+#ifdef TIF_POLLING_NRFLAG
 static inline int tsk_is_polling(struct task_struct *p)
 {
 	return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG);