wrapper/atomic.h

   1 /* SPDX-License-Identifier: (GPL-2.0 OR LGPL-2.1)
   2  *
   3  * wrapper/atomic.h
   4  *
   5  * wrapper around linux/atomic.h.
   6  *
   7  * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_WRAPPER_ATOMIC_H
  11 #define _LTTNG_WRAPPER_ATOMIC_H
  12
  13 #include <linux/version.h>
  14 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
  15 #include <linux/atomic.h>
  16 #else
  17 #include <asm/atomic.h>
  18 #endif
  19
  20 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0))
  21 static inline void lttng_smp_mb__before_atomic(void)
  22 {
  23         smp_mb__before_atomic();
  24 }
  25
  26 static inline void lttng_smp_mb__after_atomic(void)
  27 {
  28         smp_mb__after_atomic();
  29 }
  30 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */
  31 static inline void lttng_smp_mb__before_atomic(void)
  32 {
  33         smp_mb__before_atomic_inc();
  34 }
  35
  36 static inline void lttng_smp_mb__after_atomic(void)
  37 {
  38         smp_mb__after_atomic_inc();
  39 }
  40 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)) */
  41
  42 #endif /* _LTTNG_WRAPPER_ATOMIC_H */