cpuidle: Fix poll_idle() noinstr annotation

The instrumentation_begin()/end() annotations in poll_idle() were
complete nonsense. Specifically they caused tracing to happen in the
middle of noinstr code, resulting in RCU splats.

Now that local_clock() is noinstr, mark up the rest and let it rip.

Fixes: 00717eb8 ("cpuidle: Annotate poll_idle()")
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/oe-lkp/202301192148.58ece903-oliver.sang@intel.com
Link: https://lore.kernel.org/r/20230126151323.819534689@infradead.org

drivers/cpuidle/cpuidle.c

@@ -426,7 +426,7 @@ void cpuidle_reflect(struct cpuidle_device *dev, int index)
  * @dev:   the cpuidle device
  *
  */
-u64 cpuidle_poll_time(struct cpuidle_driver *drv,
+__cpuidle u64 cpuidle_poll_time(struct cpuidle_driver *drv,
 		      struct cpuidle_device *dev)
 {
 	int i;

drivers/cpuidle/poll_state.c

@@ -15,7 +15,6 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev,
 {
 	u64 time_start;
 
-	instrumentation_begin();
 	time_start = local_clock();
 
 	dev->poll_time_limit = false;
@@ -42,7 +41,6 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev,
 	raw_local_irq_disable();
 
 	current_clr_polling();
-	instrumentation_end();
 
 	return index;
 }