linux-kernel - Re: [PATCH net-next] net: dsa: add CONFIG_NET_DSA

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Date:   Tue, 11 Apr 2017 23:20:26 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next] net: dsa: add CONFIG_NET_DSA_LEGACY

> +#ifdef CONFIG_NET_DSA_LEGACY
>  static const char *mv88e6xxx_drv_probe(struct device *dsa_dev,
>  				       struct device *host_dev, int sw_addr,
>  				       void **priv)
> @@ -4256,6 +4257,7 @@ static const char *mv88e6xxx_drv_probe(struct device *dsa_dev,
>  
>  	return NULL;
>  }
> +#endif /* CONFIG_NET_DSA_LEGACY */

Hi Vivien

Rather than scatter #ifdef everywhere, can you use

       if (!IS_ENABLED(CONFIG_NET_DSA_LEGACY))
              return NULL

The compiler will then throw away the rest of the function, after
checking it does actually compile.

	 Andrew