[PATCH 2/5] xen/common: Cleanup use of __attribute__((packed))

[Andrew Cooper <andrew.cooper3@citrix.com>]

And standardise on having the statement at the head of the struct/union rather
than at the tail.

This introduced a formal define in compiler.h, and contains some mechanical
shuffling in common code.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Keir Fraser <keir@xen.org>
CC: Jan Beulich <JBeulich@suse.com>
CC: George Dunlap <george.dunlap@eu.citrix.com>
---
 xen/common/trace.c         |    4 ++--
 xen/common/unlzma.c        |    4 ++--
 xen/include/xen/compat.h   |    2 +-
 xen/include/xen/compiler.h |    2 ++
 4 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/xen/common/trace.c b/xen/common/trace.c
index dde662f..fa5c6ae 100644
--- a/xen/common/trace.c
+++ b/xen/common/trace.c
@@ -641,11 +641,11 @@ static inline void insert_wrap_record(struct t_buf *buf,
 
 static inline void insert_lost_records(struct t_buf *buf)
 {
-    struct {
+    struct __packed {
         u32 lost_records;
         u32 did:16, vid:16;
         u64 first_tsc;
-    } __attribute__((packed)) ed;
+    } ed;
 
     ed.vid = current->vcpu_id;
     ed.did = current->domain->domain_id;
diff --git a/xen/common/unlzma.c b/xen/common/unlzma.c
index 4d04330..103d2df 100644
--- a/xen/common/unlzma.c
+++ b/xen/common/unlzma.c
@@ -214,11 +214,11 @@ rc_bit_tree_decode(struct rc *rc, uint16_t *p, int num_levels, int *symbol)
  */
 
 
-struct lzma_header {
+struct __packed lzma_header {
 	uint8_t pos;
 	uint32_t dict_size;
 	uint64_t dst_size;
-} __attribute__ ((packed)) ;
+};
 
 
 #define LZMA_BASE_SIZE 1846
diff --git a/xen/include/xen/compat.h b/xen/include/xen/compat.h
index ca60699..d58aede 100644
--- a/xen/include/xen/compat.h
+++ b/xen/include/xen/compat.h
@@ -14,7 +14,7 @@
 #define __DEFINE_COMPAT_HANDLE(name, type) \
     typedef struct { \
         compat_ptr_t c; \
-        type *_[0] __attribute__((__packed__)); \
+        type *_[0] __packed; \
     } __compat_handle_ ## name
 
 #define DEFINE_COMPAT_HANDLE(name) \
diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h
index c80398d..6e07990 100644
--- a/xen/include/xen/compiler.h
+++ b/xen/include/xen/compiler.h
@@ -16,6 +16,8 @@
 
 #define noreturn      __attribute__((noreturn))
 
+#define __packed      __attribute__((packed))
+
 #if (!defined(__clang__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 5))
 #define unreachable() do {} while (1)
 #else
-- 
1.7.10.4