lib/bug.h

   1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
   2  *
   3  * lib/bug.h
   4  *
   5  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  */
   7
   8 #ifndef _LTTNG_BUG_H
   9 #define _LTTNG_BUG_H
  10
  11 #include <linux/version.h>
  12
  13 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38))
  14 #define LTTNG_BUILD_BUG_ON(cond) BUILD_BUG_ON(cond)
  15 #else
  16 #define LTTNG_BUILD_BUG_ON(cond) MAYBE_BUILD_BUG_ON(cond)
  17 #endif
  18
  19 /**
  20  * BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  21  * @condition: the condition which should be false.
  22  *
  23  * If the condition is a constant and true, the compiler will generate a build
  24  * error. If the condition is not constant, a BUG will be triggered at runtime
  25  * if the condition is ever true. If the condition is constant and false, no
  26  * code is emitted.
  27  */
  28 #define BUILD_RUNTIME_BUG_ON(condition)                         \
  29         do {                                                    \
  30                 if (__builtin_constant_p(condition))            \
  31                         LTTNG_BUILD_BUG_ON(condition);          \
  32                 else                                            \
  33                         BUG_ON(condition);                      \
  34         } while (0)
  35
  36 #endif