Add BUILD_BUG_ON_MSG which behaves like BUILD_BUG_ON (with optimizations
enabled), except that it allows you to specify the error message you
want emitted as the third parameter. Under the hood, this relies on
_BUILD_BUG_INTERNAL, which does the actual work and is pretty-much
identical to BUILD_BUG_ON.
Signed-off-by: Daniel Santos <daniel.santos@xxxxxxxxx>
---
include/linux/bug.h | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/include/linux/bug.h b/include/linux/bug.h
index 1b43ea2..f6f81f6 100644
--- a/include/linux/bug.h
+++ b/include/linux/bug.h
@@ -16,6 +16,7 @@ struct pt_regs;
#define BUILD_BUG_ON_NOT_POWER_OF_2(n)
#define BUILD_BUG_ON_ZERO(e) (0)
#define BUILD_BUG_ON_NULL(e) ((void*)0)
+#define BUILD_BUG_ON_MSG(cond, msg) (0)
#define BUILD_BUG_ON(condition) (0)
#define BUILD_BUG() (0)
#else /* __CHECKER__ */
@@ -38,6 +39,27 @@ struct pt_regs;
*/
#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
+#define __BUILD_BUG_INTERNAL(condition, msg, line) \
+ do { \
+ extern void __build_bug_on_failed_ ## line \
+ (void) __compiletime_error(msg); \
+ __compiletime_error_fallback(condition); \
+ if (condition) \
+ __build_bug_on_failed_ ## line(); \
+ } while (0)
+
+#define _BUILD_BUG_INTERNAL(condition, msg, line) \
+ __BUILD_BUG_INTERNAL(condition, msg, line)
+
+/**
+ * BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
+ * error message.
+ * @condition: the condition which the compiler should know is false.
+ *
+ * See BUILD_BUG_ON for description.
+ */
+#define BUILD_BUG_ON_MSG(cond, msg) _BUILD_BUG_INTERNAL(cond, msg, __LINE__)
+
/**
* BUILD_BUG_ON - break compile if a condition is true.
* @condition: the condition which the compiler should know is false.
--
1.7.3.4
--
To unsubscribe from this list: send the line "unsubscribe linux-sparse" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
