1 files changed, 66 insertions, 0 deletions
diff --git a/include/linux/ltt-core.h b/include/linux/ltt-core.h
new file mode 100644
index 00000000000..d02c1e64544
--- /dev/null
+++ b/include/linux/ltt-core.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2005-2010 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
+ *
+ * This contains the core definitions for the Linux Trace Toolkit.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+#ifndef LTT_CORE_H
+#define LTT_CORE_H
+
+/* Keep track of trap nesting inside LTT */
+DECLARE_PER_CPU(unsigned int, ltt_nesting);
+
+#ifndef MAYBE_BUILD_BUG_ON
+#define MAYBE_BUILD_BUG_ON(cond)					\
+	do {								\
+		if (__builtin_constant_p(cond))				\
+			BUILD_BUG_ON(cond);				\
+	} while (0)
+#endif
+
+#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+
+/*
+ * Calculate the offset needed to align the type.
+ * size_of_type must be non-zero.
+ */
+static inline unsigned int ltt_align(size_t align_drift, size_t size_of_type)
+{
+	return offset_align(align_drift, min(sizeof(void *), size_of_type));
+}
+/* Default arch alignment */
+#define LTT_ALIGN
+
+static inline int ltt_get_alignment(void)
+{
+	return sizeof(void *);
+}
+
+extern unsigned int ltt_fmt_largest_align(size_t align_drift, const char *fmt);
+
+#else
+
+static inline unsigned int ltt_align(size_t align_drift,
+		 size_t size_of_type)
+{
+	return 0;
+}
+
+#define LTT_ALIGN __attribute__((packed))
+
+static inline int ltt_get_alignment(void)
+{
+	return 0;
+}
+
+static inline unsigned int ltt_fmt_largest_align(size_t align_drift,
+		const char *fmt)
+{
+	return 0;
+}
+
+#endif /* HAVE_EFFICIENT_UNALIGNED_ACCESS */
+
+#endif /* LTT_CORE_H */