linux-kernel - Re: [PATCH] m68k/irq: don't use pr

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Date:	Sun, 18 Dec 2011 09:06:47 -0800
From:	Joe Perches <joe@...ches.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	debian-kernel@...ts.debian.org, linux-m68k@...r.kernel.org,
	Thorsten Glaser <tg@...ian.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68k/irq: don't use pr_crit in an header

On Sun, 2011-12-18 at 11:42 +0100, Uwe Kleine-König wrote:
> On Sun, Dec 18, 2011 at 11:32:21AM +0100, Geert Uytterhoeven wrote:
> > 2011/12/17 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>:
> > > Using pr_crit in an header results in funny messages. Consider
> > >        #define pr_fmt(fmt) "mydriver: " fmt
> > >        #include <linux/hardirq.h>
> > > which makes the message from ack_bad_irq
> > >        mydriver: unexpected IRQ trap...
> > > so better use plain printk with KERN_CRIT directly.

Why or when is that inappropriate?

> I only wondered if it is also desirable to
> have messages in headers modified depending on the module the header is
> included in.
[]
> > Nack. Nowadays pr_crit(...) is recommended over "printk(KERN_CRIT ...)".
> I know that, I just wonder if the proponents of this recommendation are
> aware of the issue when using pr_* in headers. Joe?

I believe it to be a feature rather than a defect.

For instance:  commit 256ee435b9a9ee9cca69602fe8046b27ca99fbee

    netdevice: Convert printk to pr_info in netif_tx_stop_queue
    
    This allows any caller to be prefaced by any specific
    pr_fmt to better identify which device driver is using
    this function inappropriately. 

cheers, Joe

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