linux-kernel - Re: [PATCH 1/9] watchdog: WatchDog Timer Driver Core

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Message-Id: <201107301040.47664.arnd@arndb.de>
Date:	Sat, 30 Jul 2011 10:40:47 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Joe Perches <joe@...ches.com>
Cc:	Wim Van Sebroeck <wim@...ana.be>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Wolfram Sang <w.sang@...gutronix.de>
Subject: Re: [PATCH 1/9] watchdog: WatchDog Timer Driver Core - Add basic framework

On Thursday 28 July 2011, Joe Perches wrote:
> Perhaps add some logging helpers to the .h?
> 
> #define wdd_emerg(wd, fmt, ...)                                 \
>         pr_emerg("%s: " fmt, (wd)->info->identity, ##__VA_ARGS__)
> #define wdd_crit(wd, fmt, ...)                                  \
>         pr_crit("%s: " fmt, (wd)->info->identity, ##__VA_ARGS__)
> #define wdd_alert(wd, fmt, ...)                                 \
>         pr_alert("%s: " fmt, (wd)->info->identity, ##__VA_ARGS__)
> #define wdd_err(wd, fmt, ...)                                   \
>         pr_err("%s: " fmt, (wd)->info->identity, ##__VA_ARGS__)
> #define wdd_notice(wd, fmt, ...)                                \
>         pr_notice("%s: " fmt, (wd)->info->identity, ##__VA_ARGS__)
> #define wdd_warn(wd, fmt, ...)                                  \
>         pr_warn("%s: " fmt, (wd)->info->identity, ##__VA_ARGS__)
> #define wdd_info(wd, fmt, ...)                                  \
>         pr_info("%s: " fmt, (wd)->info->identity, ##__VA_ARGS__)
> #define wdd_dbg(wd, fmt, ...)                                   \
>         pr_debug("%s: " fmt, (wd)->info->identity, ##__VA_ARGS__)

No, please don't. Adding driver-specific debugging macros tends to confuse
more than it helps, IMHO.

> > +     err = misc_register(&watchdog_miscdev);
> > +     if (err != 0) {
> > +             pr_err("%s: cannot register miscdev on minor=%d (err=%d).\n",
> > +                     watchdog->info->identity, WATCHDOG_MINOR, err);
> 
>                 wdd_err(watchdog, "cannot register watchdog on minor %d, err: %d\n",
>                         WATCHDOG_MINOR, err);

I think changing them could be useful, but I'd rather change them to
dev_err etc and pass the underlying device.

	Arnd
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