lib/bug.h

   1 #ifndef _LTTNG_BUG_H
   2 #define _LTTNG_BUG_H
   3
   4 /*
   5  * lib/bug.h
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <linux/version.h>
  25
  26 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38))
  27 #define LTTNG_BUILD_BUG_ON(cond) BUILD_BUG_ON(cond)
  28 #else
  29 #define LTTNG_BUILD_BUG_ON(cond) MAYBE_BUILD_BUG_ON(cond)
  30 #endif
  31
  32 /**
  33  * BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  34  * @condition: the condition which should be false.
  35  *
  36  * If the condition is a constant and true, the compiler will generate a build
  37  * error. If the condition is not constant, a BUG will be triggered at runtime
  38  * if the condition is ever true. If the condition is constant and false, no
  39  * code is emitted.
  40  */
  41 #define BUILD_RUNTIME_BUG_ON(condition)                         \
  42         do {                                                    \
  43                 if (__builtin_constant_p(condition))            \
  44                         LTTNG_BUILD_BUG_ON(condition);          \
  45                 else                                            \
  46                         BUG_ON(condition);                      \
  47         } while (0)
  48
  49 #endif