linux-kernel - Re: Tiny error in printk output for clocksource : a3:<6>Time: acpi

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Date:	Thu, 28 Sep 2006 10:03:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	Denis Vlasenko <vda.linux@...glemail.com>
Cc:	Randy Dunlap <rdunlap@...otime.net>, Greg KH <greg@...ah.com>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Tiny error in printk output for clocksource : a3:<6>Time:
	acpi_pm clocksource has been installed.

On Thu, 2006-09-28 at 18:19 +0200, Denis Vlasenko wrote:
> You are trying to cover all possible cases with this monstrosity:
> extern char *__dev_addr6_fmt(char* buf, const unsigned char *addr);
> #define DEV_ADDR6_FMT "%s" /* expands to: "FF:FF:FF:FF:FF:FF" */
> #define DEV_ADDR6_BUF char __dev_addr6_buf[sizeof("FF:FF:FF:FF:FF:FF")]
> DEV_ADDR6_BUF;
> ...
> printk(", h/w address " DEV_ADDR6_FMT "\n", DEV_ADDR6(dev->dev_addr));

Yup, it's not pretty.

> Why don't you use a parameter for DEV_ADDR6{_BUF}? DEV_ADDR6_BUF(var_name).
> DEV_ADDR6(var_name, addr). That would be less cryptic.

Your idea makes code a bit visually longer, but I've no real objection.

> print_mac(", h/w address ", dev->dev_addr, "\n");

> > Would a patch with a DEV6_ADDR->EUI48 substitution
> > be acceptable?
> 
> Maybe. Doesn't look obvious, but if it is in standards...

Perhaps:

extern char *__EUI48_fmt(char *buf, const unsigned char *addr);
#define EUI48_FMT "%s" /* expands to: "FF:FF:FF:FF:FF:FF" */
#define DECLARE_EUI48(name) char name[sizeof("FF:FF:FF:FF:FF:FF")]
#define EUI48(name, addr) __EUI48_fmt(name, (const unsigned char *)addr)

use case:

{
	DECLARE_EUI48(eui48);
	printk("mac: " EUI48_FMT, EUI48(eui48, dev->dev_addr));
}

Here's one with an assumption of an eui48 buffer name.

extern char *__EUI48_fmt(char *buf, const unsigned char *addr);
#define EUI48_FMT "%s" /* expands to: "FF:FF:FF:FF:FF:FF" */
#define DECLARE_EUI48 char __eui48_buf[sizeof("FF:FF:FF:FF:FF:FF")]
#define EUI48(addr) __EUI48_fmt(__eui48_buf, (const unsigned char *)addr)

use case:

{
	DECLARE_EUI48;
	printk("mac: " EUI48_FMT, EUI48(dev->dev_addr));
}

Which one do you like more?

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