tools/testing/selftests/rcutorture/formal/srcu-cbmc/src/preempt.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef PREEMPT_H
   3 #define PREEMPT_H
   4
   5 #include <stdbool.h>
   6
   7 #include "bug_on.h"
   8
   9 /* This flag contains garbage if preempt_disable_count is 0. */
  10 extern __thread int thread_cpu_id;
  11
  12 /* Support recursive preemption disabling. */
  13 extern __thread int preempt_disable_count;
  14
  15 void preempt_disable(void);
  16 void preempt_enable(void);
  17
  18 static inline void preempt_disable_notrace(void)
  19 {
  20         preempt_disable();
  21 }
  22
  23 static inline void preempt_enable_no_resched(void)
  24 {
  25         preempt_enable();
  26 }
  27
  28 static inline void preempt_enable_notrace(void)
  29 {
  30         preempt_enable();
  31 }
  32
  33 static inline int preempt_count(void)
  34 {
  35         return preempt_disable_count;
  36 }
  37
  38 static inline bool preemptible(void)
  39 {
  40         return !preempt_count();
  41 }
  42
  43 static inline int get_cpu(void)
  44 {
  45         preempt_disable();
  46         return thread_cpu_id;
  47 }
  48
  49 static inline void put_cpu(void)
  50 {
  51         preempt_enable();
  52 }
  53
  54 static inline void might_sleep(void)
  55 {
  56         BUG_ON(preempt_disable_count);
  57 }
  58
  59 #endif