From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 8 Jun 2011 21:39:46 +0000 (-0400)
Subject: Add bug detection support for alignment header
X-Git-Tag: v2.0-pre1~57
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=58c78202dac3ba4678d59254d59e8b54628377c7;p=lttng-modules.git

Add bug detection support for alignment header

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/lib/bug.h b/lib/bug.h
new file mode 100644
index 00000000..8243cc94
--- /dev/null
+++ b/lib/bug.h
@@ -0,0 +1,29 @@
+#ifndef _LTTNG_BUG_H
+#define _LTTNG_BUG_H
+
+/*
+ * lib/bug.h
+ *
+ * (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+/**
+ * BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
+ * @condition: the condition which should be false.
+ *
+ * If the condition is a constant and true, the compiler will generate a build
+ * error. If the condition is not constant, a BUG will be triggered at runtime
+ * if the condition is ever true. If the condition is constant and false, no
+ * code is emitted.
+ */
+#define BUILD_RUNTIME_BUG_ON(condition)				\
+	do {							\
+		if (__builtin_constant_p(condition))		\
+			BUILD_BUG_ON(condition);		\
+		else						\
+			BUG_ON(condition);			\
+	} while (0)
+
+#endif
diff --git a/ltt-tracer-core.h b/ltt-tracer-core.h
index 4357cec3..d464877d 100644
--- a/ltt-tracer-core.h
+++ b/ltt-tracer-core.h
@@ -14,7 +14,7 @@
 #include <linux/list.h>
 #include <linux/percpu.h>
 
-#if 1 //ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
 /* Align data on its natural alignment */
 #define RING_BUFFER_ALIGN
 #endif