[dpdk-dev] [PATCH v2] net/mlx5: fix linkage error for glue lib

[Shahaf Shuler <shahafs@mellanox.com>]

From: Yaroslav Brustinov <ybrustin@cisco.com>

addressing a gcc 4.7.2 bug that cannot be reproduced with latter
versions:

"bin/ld: Warning: alignment 8 of symbol `mlx5_glue' in
src/dpdk/drivers/net/mlx5/mlx5_glue.c.21.o is smaller than 16 in
src/dpdk/drivers/net/mlx5/mlx5_rxq.c.21.o"

Fix it be forcing the alignment of the glue lib.

Fixes: 0e83b8e536c1 ("net/mlx5: move rdma-core calls to separate file")
Cc: stable@dpdk.org
Cc: nelio.laranjeiro@6wind.com
Cc: adrien.mazarguil@6wind.com

Signed-off-by: Yaroslav Brustinov <ybrustin@cisco.com>
Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
---
On v2:
 - Forced alignment using alignas to the size of the cacheline.

---
 drivers/net/mlx5/mlx5_glue.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_glue.c b/drivers/net/mlx5/mlx5_glue.c
index c7965e51fe..705232f614 100644
--- a/drivers/net/mlx5/mlx5_glue.c
+++ b/drivers/net/mlx5/mlx5_glue.c
@@ -6,6 +6,7 @@
 #include <errno.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdalign.h>
 
 /*
  * Not needed by this file; included to work around the lack of off_t
@@ -23,6 +24,8 @@
 #pragma GCC diagnostic error "-Wpedantic"
 #endif
 
+#include <rte_config.h>
+
 #include "mlx5_autoconf.h"
 #include "mlx5_glue.h"
 
@@ -343,7 +346,8 @@ mlx5_glue_dv_create_qp(struct ibv_context *context,
 #endif
 }
 
-const struct mlx5_glue *mlx5_glue = &(const struct mlx5_glue){
+alignas(RTE_CACHE_LINE_SIZE)
+const struct mlx5_glue *mlx5_glue = &(const struct mlx5_glue) {
 	.version = MLX5_GLUE_VERSION,
 	.fork_init = mlx5_glue_fork_init,
 	.alloc_pd = mlx5_glue_alloc_pd,
-- 
2.12.0