net: openvswitch: Use struct_size()

Use struct_size() instead of hand writing it.
This is less verbose and more robust.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/e5122b4ff878cbf3ed72653a395ad5c4da04dc1e.1697264974.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
index 4f3b179..d108ae0 100644 (file)
--- a/net/openvswitch/flow_table.c
+++ b/net/openvswitch/flow_table.c
@@ -220,16 +220,13 @@ static struct mask_array *tbl_mask_array_alloc(int size)
        struct mask_array *new;
 
        size = max(MASK_ARRAY_SIZE_MIN, size);
-       new = kzalloc(sizeof(struct mask_array) +
-                     sizeof(struct sw_flow_mask *) * size +
+       new = kzalloc(struct_size(new, masks, size) +
                      sizeof(u64) * size, GFP_KERNEL);
        if (!new)
                return NULL;
 
        new->masks_usage_zero_cntr = (u64 *)((u8 *)new +
-                                            sizeof(struct mask_array) +
-                                            sizeof(struct sw_flow_mask *) *
-                                            size);
+                                            struct_size(new, masks, size));
 
        new->masks_usage_stats = __alloc_percpu(sizeof(struct mask_array_stats) +
                                                sizeof(u64) * size,