3 files changed, 20 insertions, 1 deletions

diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index dfadc96e9d6..2f4079175af 100644
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -29,6 +29,7 @@
    the kernel context */
 #define __cold                  __attribute__((__cold__))
 
+#define __linktime_error(message) __attribute__((__error__(message)))
 
 #if __GNUC_MINOR__ >= 5
 /*
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 320d6c94ff8..4a243546d14 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -293,7 +293,9 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 #ifndef __compiletime_error
 # define __compiletime_error(message)
 #endif
-
+#ifndef __linktime_error
+# define __linktime_error(message)
+#endif
 /*
  * Prevent the compiler from merging or refetching accesses.  The compiler
  * is also forbidden from reordering successive instances of ACCESS_ONCE(),
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index e8b1597b5cf..f48e8a52854 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -665,6 +665,7 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
 #define BUILD_BUG_ON_ZERO(e) (0)
 #define BUILD_BUG_ON_NULL(e) ((void*)0)
 #define BUILD_BUG_ON(condition)
+#define BUILD_BUG() (0)
 #else /* __CHECKER__ */
 
 /* Force a compilation error if a constant expression is not a power of 2 */
@@ -703,6 +704,21 @@ extern int __build_bug_on_failed;
                 if (condition) __build_bug_on_failed = 1;       \
         } while(0)
 #endif
+
+/**
+ * BUILD_BUG - break compile if used.
+ *
+ * If you have some code that you expect the compiler to eliminate at
+ * build time, you should use BUILD_BUG to detect if it is
+ * unexpectedly used.
+ */
+#define BUILD_BUG()                                             \
+        do {                                                    \
+                extern void __build_bug_failed(void)            \
+                        __linktime_error("BUILD_BUG failed");   \
+                __build_bug_failed();                           \
+        } while (0)
+
 #endif  /* __CHECKER__ */
 
 /* Trap pasters of __FUNCTION__ at compile-time */