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

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Date:	Thu, 01 Mar 2007 17:52:48 +0800
From:	"Wu, Bryan" <bryan.wu@...log.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	bryan.wu@...log.com, 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, 2007-03-01 at 01:32 -0800, Andrew Morton wrote:
> 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.

Yes, it can be writen as a C function.
We just follow other implementation in the drivers/net/smc91x.h

start at line 1156 of
---
#ifndef SMC_GET_MAC_ADDR
#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;                      \
        } while (0)
#endif
_

If you think this is necessary, we may rewrite it in C function.

Thanks
-Bryan
-
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