[PATCH v7 24/29] examples/vhost_blk: replace packed attributes

[Andre Muezerie]

MSVC struct packing is not compatible with GCC. Replace macro
__rte_packed with __rte_packed_begin to push existing pack value
and set packing to 1-byte and macro __rte_packed_end to restore
the pack value prior to the push.

Macro __rte_packed_end is deliberately utilized to trigger a
MSVC compiler warning if no existing packing has been pushed allowing
easy identification of locations where the __rte_packed_begin is
missing.

Signed-off-by: Andre Muezerie <andre...@linux.microsoft.com>
---
 examples/vhost_blk/blk_spec.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/examples/vhost_blk/blk_spec.h b/examples/vhost_blk/blk_spec.h
index 3c54f70eaf..6c6a36d471 100644
--- a/examples/vhost_blk/blk_spec.h
+++ b/examples/vhost_blk/blk_spec.h
@@ -73,6 +73,7 @@ struct vhost_memory_padded {
        struct vhost_memory_region regions[VHOST_USER_MEMORY_MAX_NREGIONS];
 };
 
+__rte_packed_begin
 struct vhost_user_msg {
        enum vhost_user_request request;
 
@@ -89,6 +90,6 @@ struct vhost_user_msg {
                struct vhost_memory_padded memory;
                struct vhost_user_config cfg;
        } payload;
-} __rte_packed;
+} __rte_packed_end;
 
 #endif
-- 
2.47.0.vfs.0.3