linux-kernel - Re: [PATCH -mm 4/5] Blackfin: patch add blackfin support in smc91x ethernet controller driver

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Message-Id: <20070301013201.e43ae3f5.akpm@linux-foundation.org>
Date:	Thu, 1 Mar 2007 01:32:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	bryan.wu@...log.com
Cc:	nico@....org, jgarzik@...ox.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 4/5] Blackfin: patch add blackfin support in smc91x
 ethernet controller driver

On Thu, 01 Mar 2007 17:23:23 +0800 "Wu, Bryan" <bryan.wu@...log.com> wrote:

> On Thu, 2007-03-01 at 00:54 -0800, Andrew Morton wrote:
> > On Thu, 01 Mar 2007 12:15:29 +0800 "Wu, Bryan" <bryan.wu@...log.com> wrote:
> > 
> > > +/* check if the mac in reg is valid */
> > > +#define SMC_GET_MAC_ADDR(addr)					\
> > > +	do {							\
> > > +		unsigned int __v;				\
> > > +		__v = SMC_inw( ioaddr, ADDR0_REG );		\
> > > +		addr[0] = __v; addr[1] = __v >> 8;		\
> > > +		__v = SMC_inw( ioaddr, ADDR1_REG );		\
> > > +		addr[2] = __v; addr[3] = __v >> 8;		\
> > > +		__v = SMC_inw( ioaddr, ADDR2_REG );		\
> > > +		addr[4] = __v; addr[5] = __v >> 8;		\
> > > +		if (*(u32 *)(&addr[0]) == 0xFFFFFFFF) {		\
> > > +			random_ether_addr(addr);		\
> > > +		}						\
> > > +	} while (0)
> > 
> > Please follow kernel coding style:
> > 
> > 	__v = SMC_inw(ioaddr, ADDR2_REG);
> > 

You skipped this:

> > Can this not be implemented as a C function?

> +#define SMC_GET_MAC_ADDR(addr)					\
> +	do {							\
> +		unsigned int __v;				\
> +		__v = SMC_inw(ioaddr, ADDR0_REG);		\
> +		addr[0] = __v; addr[1] = __v >> 8;		\
> +		__v = SMC_inw(ioaddr, ADDR1_REG);		\
> +		addr[2] = __v; addr[3] = __v >> 8;		\
> +		__v = SMC_inw(ioaddr, ADDR2_REG);		\
> +		addr[4] = __v; addr[5] = __v >> 8;		\
> +		if (*(u32 *)(&addr[0]) == 0xFFFFFFFF) {		\
> +			random_ether_addr(addr);		\
> +		}						\
> +	} while (0)

It can be, I think...

Please always prefer coding in C over coding in cpp.
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