netdev - [net-next 02/15] net/mlx5e: Replace zero-length arrays with DECLARE_FLEX

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Date:   Tue, 29 Nov 2022 21:11:39 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>
Subject: [net-next 02/15] net/mlx5e: Replace zero-length arrays with DECLARE_FLEX_ARRAY() helper

From: "Gustavo A. R. Silva" <gustavoars@...nel.org>

Zero-length arrays are deprecated and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length arrays
declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for flexible-array members in unions.

Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/222
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
index 48241317a535..0db41fa4a9a6 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
@@ -97,8 +97,8 @@ struct mlx5_flow_attr {
 	} lag;
 	/* keep this union last */
 	union {
-		struct mlx5_esw_flow_attr esw_attr[0];
-		struct mlx5_nic_flow_attr nic_attr[0];
+		DECLARE_FLEX_ARRAY(struct mlx5_esw_flow_attr, esw_attr);
+		DECLARE_FLEX_ARRAY(struct mlx5_nic_flow_attr, nic_attr);
 	};
 };
 
-- 
2.38.1