RHEL-8.1 backported a couple features breaking wireguard compilation.

[Jason A. Donenfeld]

Thanks. The rhel backporting policy has generally been to not support older
point releases once new ones exist. So we'll move to supporting rhel 8.1
and drop 8.0. If you submit a properly formatted git patch with a sign off
line, I can apply it.

On Sun, Dec 8, 2019, 11:41 Sergey Ivanov <seriv at cs.umd.edu> wrote:

> Hi,
>
> on kernel 4.18.0-147.el8.x86_64 I am not able to compile
> https://git.zx2c4.com/WireGuard sources, tried tags 0.0.20191127 and
> 0.0.20191205 and master at 5eb87fb649.
>
> To compile it I did the following workaround:
>
> ===
>
>
> $ git diff
> diff --git a/src/compat/compat.h b/src/compat/compat.h
> index ab22fa4..6e034b5 100644
> --- a/src/compat/compat.h
> +++ b/src/compat/compat.h
> @@ -326,7 +326,7 @@ static inline int wait_for_random_bytes(void)
>   }
>   #endif
>
> -#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 19, 0) && LINUX_VERSION_CODE
>  >= KERNEL_VERSION(4, 2, 0)
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 19, 0) && defined(ISRHEL8)
> && RHEL_MINOR < 1 && LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
>   #include <linux/random.h>
>   #include <linux/slab.h>
>   struct rng_is_initialized_callback {
> @@ -831,7 +831,7 @@ static inline void skb_mark_not_on_list(struct
> sk_buff *skb)
>   }
>   #endif
>
> -#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0)
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 20, 0) && (!defined(ISRHEL8)
> || RHEL_MINOR < 1)
>   #define NLA_EXACT_LEN NLA_UNSPEC
>   #endif
>   #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
> ===
>
> --
>
>    Regards,
>
>    Sergey Ivanov
>
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>
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