netdev - Re: [net-next, 2/5] sh_eth: WARN on access to a register not implemented in a particular chip

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Date:	Thu, 5 Mar 2015 10:02:45 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Ben Hutchings <ben.hutchings@...ethink.co.uk>,
	"David S. Miller" <davem@...emloft.net>
cc:	netdev@...r.kernel.org, linux-kernel@...ts.codethink.co.uk,
	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>,
	Mitsuhiro Kimura <mitsuhiro.kimura.kc@...esas.com>,
	Yoshihiro Kaneko <ykaneko0929@...il.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [net-next, 2/5] sh_eth: WARN on access to a register not
 implemented in a particular chip

Replying to a patchwork mbox, as I noticed this is in net-next.

On Thu, 26 Feb 2015, Ben Hutchings wrote:
> Currently we may silently read/write a register at offset 0.  Change
> this to WARN and then ignore the write or read-back all-ones.
> 
> Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
> Acked-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

While this may be a good idea for debugging...

> --- a/drivers/net/ethernet/renesas/sh_eth.h
> +++ b/drivers/net/ethernet/renesas/sh_eth.h
> @@ -543,19 +543,29 @@ static inline void sh_eth_soft_swap(char *src, int len)
>  #endif
>  }
>  
> +#define SH_ETH_OFFSET_INVALID	((u16) ~0)
> +
>  static inline void sh_eth_write(struct net_device *ndev, u32 data,
>  				int enum_index)
>  {
>  	struct sh_eth_private *mdp = netdev_priv(ndev);
> +	u16 offset = mdp->reg_offset[enum_index];
> +
> +	if (WARN_ON(offset == SH_ETH_OFFSET_INVALID))
> +		return;

... adding WARN_ON() to static inline functions increases code size a lot:

$ size drivers/net/ethernet/renesas/sh_eth.o{.orig,}
   text	   data	    bss	    dec	    hex	filename
  23352	   1136	      0	  24488	   5fa8	drivers/net/ethernet/renesas/sh_eth.o.orig
  27225	   1136	      0	  28361	   6ec9	drivers/net/ethernet/renesas/sh_eth.o
$

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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