netdev - [PATCH net-next 5/7] mlxsw: core_acl: Use an array instead of a struct with a zero-length array

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Date:   Sun,  6 Dec 2020 10:22:25 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, jiri@...dia.com,
        petrm@...dia.com, mlxsw@...dia.com,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 5/7] mlxsw: core_acl: Use an array instead of a struct with a zero-length array

From: Ido Schimmel <idosch@...dia.com>

Suppresses the following coccinelle warning:

drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c:139:3-7:
WARNING use flexible-array member instead

Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
 .../mellanox/mlxsw/core_acl_flex_keys.c       | 26 ++++++++-----------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c
index 9f6905fa6b47..f1b09c2f9eda 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c
@@ -133,10 +133,8 @@ mlxsw_afk_key_info_find(struct mlxsw_afk *mlxsw_afk,
 }
 
 struct mlxsw_afk_picker {
-	struct {
-		DECLARE_BITMAP(element, MLXSW_AFK_ELEMENT_MAX);
-		unsigned int total;
-	} hits[0];
+	DECLARE_BITMAP(element, MLXSW_AFK_ELEMENT_MAX);
+	unsigned int total;
 };
 
 static void mlxsw_afk_picker_count_hits(struct mlxsw_afk *mlxsw_afk,
@@ -154,8 +152,8 @@ static void mlxsw_afk_picker_count_hits(struct mlxsw_afk *mlxsw_afk,
 
 			elinst = &block->instances[j];
 			if (elinst->element == element) {
-				__set_bit(element, picker->hits[i].element);
-				picker->hits[i].total++;
+				__set_bit(element, picker[i].element);
+				picker[i].total++;
 			}
 		}
 	}
@@ -169,13 +167,13 @@ static void mlxsw_afk_picker_subtract_hits(struct mlxsw_afk *mlxsw_afk,
 	int i;
 	int j;
 
-	memcpy(&hits_element, &picker->hits[block_index].element,
+	memcpy(&hits_element, &picker[block_index].element,
 	       sizeof(hits_element));
 
 	for (i = 0; i < mlxsw_afk->blocks_count; i++) {
 		for_each_set_bit(j, hits_element, MLXSW_AFK_ELEMENT_MAX) {
-			if (__test_and_clear_bit(j, picker->hits[i].element))
-				picker->hits[i].total--;
+			if (__test_and_clear_bit(j, picker[i].element))
+				picker[i].total--;
 		}
 	}
 }
@@ -188,8 +186,8 @@ static int mlxsw_afk_picker_most_hits_get(struct mlxsw_afk *mlxsw_afk,
 	int i;
 
 	for (i = 0; i < mlxsw_afk->blocks_count; i++) {
-		if (picker->hits[i].total > most_hits) {
-			most_hits = picker->hits[i].total;
+		if (picker[i].total > most_hits) {
+			most_hits = picker[i].total;
 			most_index = i;
 		}
 	}
@@ -206,7 +204,7 @@ static int mlxsw_afk_picker_key_info_add(struct mlxsw_afk *mlxsw_afk,
 	if (key_info->blocks_count == mlxsw_afk->max_blocks)
 		return -EINVAL;
 
-	for_each_set_bit(element, picker->hits[block_index].element,
+	for_each_set_bit(element, picker[block_index].element,
 			 MLXSW_AFK_ELEMENT_MAX) {
 		key_info->element_to_block[element] = key_info->blocks_count;
 		mlxsw_afk_element_usage_add(&key_info->elusage, element);
@@ -224,11 +222,9 @@ static int mlxsw_afk_picker(struct mlxsw_afk *mlxsw_afk,
 {
 	struct mlxsw_afk_picker *picker;
 	enum mlxsw_afk_element element;
-	size_t alloc_size;
 	int err;
 
-	alloc_size = sizeof(picker->hits[0]) * mlxsw_afk->blocks_count;
-	picker = kzalloc(alloc_size, GFP_KERNEL);
+	picker = kcalloc(mlxsw_afk->blocks_count, sizeof(*picker), GFP_KERNEL);
 	if (!picker)
 		return -ENOMEM;
 
-- 
2.28.0