From: Davide Caratti <dcara...@redhat.com>
Date: Tue, 16 May 2017 18:27:45 +0200

> @@ -2243,6 +2243,30 @@ __wsum skb_copy_and_csum_bits(const struct sk_buff 
> *skb, int offset,
>  }
>  EXPORT_SYMBOL(skb_copy_and_csum_bits);
>  
> +static __wsum warn_crc32c_csum_update(const void *buff, int len, __wsum sum)
> +{
> +     net_warn_ratelimited(
> +             "%s: attempt to compute crc32c without libcrc32c.ko\n",
> +             __func__);
> +     return 0;
> +}
> +
> +static __wsum warn_crc32c_csum_combine(__wsum csum, __wsum csum2,
> +                                    int offset, int len)
> +{
> +     net_warn_ratelimited(
> +             "%s: attempt to compute crc32c without libcrc32c.ko\n",
> +             __func__);
> +     return 0;
> +}
> +
> +const struct skb_checksum_ops *crc32c_csum_stub __read_mostly =
> +     &(struct skb_checksum_ops) {
> +     .update  = warn_crc32c_csum_update,
> +     .combine = warn_crc32c_csum_combine,
> +};
> +EXPORT_SYMBOL(crc32c_csum_stub);

Please, if you are going to do this, declare things in a more
traditional and canonical way:

static const struct skb_checksum_ops default_crc32c_ops = {
        .update  = warn_crc32c_csum_update,
        .combine = warn_crc32c_csum_combine,
};

const struct skb_checksum_ops *crc32c_csum_stub __read_mostly =
        &default_crc32c_ops;

> +static const struct skb_checksum_ops *crc32c_csum_ops __read_mostly =
> +     &(struct skb_checksum_ops) {
> +     .update  = sctp_csum_update,
> +     .combine = sctp_csum_combine,
> +};

Likewise.

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