From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 1 Mar 2012 18:39:04 +0000 (-0500)
Subject: Fix ABI: add padding to tracepoint and ring buffer config public structures
X-Git-Tag: v2.0.0-rc2~8
X-Git-Url: http://git.liburcu.org/?p=lttng-ust.git;a=commitdiff_plain;h=2e707419baf97942e59a9d13bb23e0392bc48c15

Fix ABI: add padding to tracepoint and ring buffer config public structures

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

diff --git a/include/lttng/ringbuffer-config.h b/include/lttng/ringbuffer-config.h
index 728738cd..5273f321 100644
--- a/include/lttng/ringbuffer-config.h
+++ b/include/lttng/ringbuffer-config.h
@@ -24,6 +24,7 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <urcu/arch.h>
+#include <string.h>
 #include "lttng/align.h"
 
 struct lttng_ust_lib_ring_buffer;
@@ -122,6 +123,7 @@ struct lttng_ust_lib_ring_buffer_client_cb {
  * RING_BUFFER_WAKEUP_NONE does not perform any wakeup whatsoever. The client
  * has the responsibility to perform wakeups.
  */
+#define LTTNG_UST_RING_BUFFER_CONFIG_PADDING	32
 struct lttng_ust_lib_ring_buffer_config {
 	enum {
 		RING_BUFFER_ALLOC_PER_CPU,
@@ -175,6 +177,7 @@ struct lttng_ust_lib_ring_buffer_config {
 	 * callbacks and update the cb pointers.
 	 */
 	int client_type;
+	char padding[LTTNG_UST_RING_BUFFER_CONFIG_PADDING];
 };
 
 /*
@@ -184,6 +187,7 @@ struct lttng_ust_lib_ring_buffer_config {
  * lib_ring_buffer_try_discard_reserve(), lib_ring_buffer_align_ctx() and
  * lib_ring_buffer_write().
  */
+#define LTTNG_UST_RING_BUFFER_CTX_PADDING	24
 struct lttng_ust_lib_ring_buffer_ctx {
 	/* input received by lib_ring_buffer_reserve(), saved here. */
 	struct channel *chan;		/* channel */
@@ -211,6 +215,7 @@ struct lttng_ust_lib_ring_buffer_ctx {
 					 */
 	uint64_t tsc;			/* time-stamp counter value */
 	unsigned int rflags;		/* reservation flags */
+	char padding[LTTNG_UST_RING_BUFFER_CTX_PADDING];
 };
 
 /**
@@ -235,6 +240,7 @@ void lib_ring_buffer_ctx_init(struct lttng_ust_lib_ring_buffer_ctx *ctx,
 	ctx->cpu = cpu;
 	ctx->rflags = 0;
 	ctx->handle = handle;
+	memset(ctx->padding, 0, LTTNG_UST_RING_BUFFER_CTX_PADDING);
 }
 
 /*
diff --git a/include/lttng/tracepoint-types.h b/include/lttng/tracepoint-types.h
index 37a7662b..77e2e25d 100644
--- a/include/lttng/tracepoint-types.h
+++ b/include/lttng/tracepoint-types.h
@@ -19,11 +19,13 @@ struct tracepoint_probe {
 	void *data;
 };
 
+#define TRACEPOINT_PADDING	16
 struct tracepoint {
 	const char *name;
 	int state;
 	struct tracepoint_probe *probes;
 	int *tracepoint_provider_ref;
+	char padding[TRACEPOINT_PADDING];
 };
 
 #endif /* _LTTNG_TRACEPOINT_TYPES_H */