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Date:	Mon, 11 Jun 2007 15:04:02 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
CC:	netdev@...r.kernel.org, jeff@...zik.org, davem@...emloft.net,
	arjan@...ux.intel.com, joe@...ches.com,
	shemminger@...ux-foundation.org
Subject: Re: [PATCH 1/2] [RFC] NET: Implement a standard ndev_printk family

Randy Dunlap wrote:
> On Mon, 11 Jun 2007 14:37:21 -0700 Auke Kok wrote:
> 
>>  include/linux/netdevice.h |   38 ++++++++++++++++++++++++++++++++++++++
>>  net/core/dev.c            |    5 +++++
>>  net/core/ethtool.c        |   14 +++++++-------
>>  3 files changed, 50 insertions(+), 7 deletions(-)
>>
>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
>> index 3a70f55..d185f41 100644
>> --- a/include/linux/netdevice.h
>> +++ b/include/linux/netdevice.h
>> @@ -540,6 +540,8 @@ struct net_device
>>  	struct device		dev;
>>  	/* space for optional statistics and wireless sysfs groups */
>>  	struct attribute_group  *sysfs_groups[3];
>> +
>> +	int			msg_enable;
>>  };
>>  #define to_net_dev(d) container_of(d, struct net_device, dev)
>>  
>> @@ -838,6 +840,42 @@ enum {
>>  	NETIF_MSG_WOL		= 0x4000,
>>  };
>>  
>> +#define ndev_err(netdev, level, format, arg...) \
>> +	do { if ((netdev)->msg_enable & NETIF_MSG_##level) { \
>> +		printk(KERN_ERR "%s: %s: " format, (netdev)->name, \
>> +		(netdev)->dev.parent->bus_id, ## arg); } } while (0)
>> +
> 
> I would still do what Steve H. suggested, i.e., only evaluate
> macro args one time.  E.g. (not tested & reformatted :)
> 
> +#define ndev_err(netdev, level, format, arg...) \
> +	do { \
> +		struct net_device *__nd = netdev; \
> +		if ((__nd)->msg_enable & NETIF_MSG_##level) \
> +			printk(KERN_ERR "%s: %s: " format, (__nd)->name, \
> +				(__nd)->dev.parent->bus_id, ## arg); \
> +	} while (0)
> +
> 
> Dropping the braces around the printk() too.

ahh, *now* I get it... :)

Auke
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