Re: [PATCH net-next v5 1/7] tun: Refactor CONFIG_TUN_VNET_CROSS_LE

[Willem de Bruijn]

Akihiko Odaki wrote:
> Check IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE) to save some lines and make
> future changes easier.
> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@xxxxxxxxxx>
> Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
> ---
>  drivers/net/tun.c | 26 ++++++++------------------
>  1 file changed, 8 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index e816aaba8e5f2ed06f8832f79553b6c976e75bb8..452fc5104260fe7ff5fdd5cedc5d2647cbe35c79 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -298,10 +298,10 @@ static bool tun_napi_frags_enabled(const struct tun_file *tfile)
>  	return tfile->napi_frags_enabled;
>  }
>  
> -#ifdef CONFIG_TUN_VNET_CROSS_LE
>  static inline bool tun_legacy_is_little_endian(struct tun_struct *tun)
>  {
> -	return tun->flags & TUN_VNET_BE ? false :
> +	return !(IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE) &&
> +		 (tun->flags & TUN_VNET_BE)) &&
>  		virtio_legacy_is_little_endian();

Since I have other comments to the series:

Can we make this a bit simpler to the reader, by splitting the test:

    if (IS_ENABLED(CONFIG_TUN_VNET_CROSS_LE) && tun->flags & TUN_VNET_BE)
            return false;

    return virtio_legacy_is_little_endian();