babeltrace: fix alignment issue

Fix alignment issue in babeltrace

Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/meta/recipes-kernel/lttng/babeltrace/Fix-Align-buffers-from-objstack_alloc-on-sizeof-void.patch b/meta/recipes-kernel/lttng/babeltrace/Fix-Align-buffers-from-objstack_alloc-on-sizeof-void.patch
new file mode 100644
index 0000000000..8e81d2d781
--- /dev/null
+++ b/meta/recipes-kernel/lttng/babeltrace/Fix-Align-buffers-from-objstack_alloc-on-sizeof-void.patch
@@ -0,0 +1,54 @@
+From cae67efbd9ddf2cee6bbefec076dc8933ababc43 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Fredrik=20Markstr=C3=B6m?= <fredrik.markstrom@gmail.com>
+Date: Fri, 16 May 2014 10:10:38 +0800
+Subject: [PATCH] Fix: Align buffers from objstack_alloc on sizeof(void *)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Upstream-Status: Backport
+
+The buffers from objstack_alloc will store pointers, so they must
+be aligned on a pointer's size, or else it will cause issues on the
+CPUs which do not support unaligned addresses access.
+
+Signed-off-by: Fredrik Markstrom <fredrik.markstrom@gmail.com>
+Signed-off-by: Roy Li <rongqing.li@windriver.com>
+Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
+---
+ formats/ctf/metadata/objstack.c |    5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/formats/ctf/metadata/objstack.c b/formats/ctf/metadata/objstack.c
+index 9e264a4..14d9252 100644
+--- a/formats/ctf/metadata/objstack.c
++++ b/formats/ctf/metadata/objstack.c
+@@ -27,6 +27,7 @@
+ #include <stdlib.h>
+ #include <babeltrace/list.h>
+ #include <babeltrace/babeltrace-internal.h>
++#include <babeltrace/align.h>
+ 
+ #define OBJSTACK_INIT_LEN		128
+ #define OBJSTACK_POISON			0xcc
+@@ -39,7 +40,7 @@ struct objstack_node {
+ 	struct bt_list_head node;
+ 	size_t len;
+ 	size_t used_len;
+-	char data[];
++	char __attribute__ ((aligned (sizeof(void *)))) data[];
+ };
+ 
+ BT_HIDDEN
+@@ -118,6 +119,8 @@ void *objstack_alloc(struct objstack *objstack, size_t len)
+ 	struct objstack_node *last_node;
+ 	void *p;
+ 
++	len = ALIGN(len, sizeof(void *));
++
+ 	/* Get last node */
+ 	last_node = bt_list_entry(objstack->head.prev,
+ 			struct objstack_node, node);
+-- 
+1.7.10.4
+