[batman] Align pointers in hna list elements

 
Architectures like SuperARM or Xscale needs aligned data for multi-byte
operations. GCC can create instructions sequences for packed data, but
must know that something will not be aligned. Since list_add will
operate on untyped data over void-pointers it cannot know that
hna_global_entry is packed and will create only a fast and unsafe
version for load and store operations.
It is only important for the first 5 bytes of hna_global_entry to be
packed we can force these elements to be aligned without changing
the relative addresses of the first bytes.

Signed-off-by: Sven Eckelmann <[email protected]>


git-svn-id: http://downloads.open-mesh.org/svn/batman/trunk/batman@1282 45894c77-fb22-0410-b583-ff6e7d5dbf6c

Author: marek

batman.h

@@ -153,6 +153,7 @@
 
 #define BATMANUNUSED(x) (x)__attribute__((unused))
 #define ALIGN_WORD __attribute__ ((aligned(sizeof(TYPE_OF_WORD))))
+#define ALIGN_POINTER __attribute__ ((aligned(sizeof(void*))))
 
 
 

hna.h

@@ -58,8 +58,8 @@ struct hna_global_entry
 {
 	uint32_t addr;
 	uint8_t netmask;
-	struct orig_node *curr_orig_node;
-	struct list_head_first orig_list;
+	struct orig_node *curr_orig_node ALIGN_POINTER;
+	struct list_head_first orig_list ALIGN_POINTER;
 } __attribute__((packed));
 
 struct hna_orig_ptr