X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=include%2Flttng%2Fust-tracer.h;h=0094477ea635d9ba11879a88e08b43a1e0830890;hb=1c1968450409b3c159a3000f9e1a968ff1e5f7e8;hp=4b12be184481cc5501622e2bbc97f2cf4a31a8c4;hpb=3d3dc207c16d90ecd80eb1e757fe8b94ff317c63;p=lttng-ust.git

diff --git a/include/lttng/ust-tracer.h b/include/lttng/ust-tracer.h
index 4b12be18..0094477e 100644
--- a/include/lttng/ust-tracer.h
+++ b/include/lttng/ust-tracer.h
@@ -1,8 +1,8 @@
+// SPDX-FileCopyrightText: 2005-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+//
+// SPDX-License-Identifier: MIT
+
 /*
- * SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2005-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
  * This contains the core definitions for the Linux Trace Toolkit.
  */
 
@@ -15,18 +15,23 @@
 #include <lttng/ust-version.h>
 
 /*
- * Default to having the content of the ringbuffer respect the natural
- * alignment of the system. Only pack its content on architectures we know
- * have efficient unaligned memory access.
+ * On architectures without efficient unaligned accesses, the layout of
+ * the ringbuffer's content respects the natural alignment of the
+ * system. Only pack its content on architectures we know have efficient
+ * unaligned memory access.
+ *
+ * Whether to pack the ring buffer contents or not is part of the ABI
+ * between the probe providers and the tracer, and is selected by the
+ * lttng/ust-arch.h header.
  */
 #ifndef LTTNG_UST_ARCH_HAS_EFFICIENT_UNALIGNED_ACCESS
 #define LTTNG_UST_RING_BUFFER_NATURAL_ALIGN
 #endif
 
 #ifdef LTTNG_UST_RING_BUFFER_NATURAL_ALIGN
-#define lttng_alignof(type)	__alignof__(type)
+#define lttng_ust_rb_alignof(type)	__alignof__(type)
 #else
-#define lttng_alignof(type)	1
+#define lttng_ust_rb_alignof(type)	1
 #endif
 
 /*