linux-kernel - Re: [PATCH 2/7] parport: Use more comon logging styles

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Date:   Mon, 02 Mar 2020 11:39:53 -0800
From:   Joe Perches <joe@...ches.com>
To:     Helge Deller <deller@....de>, Randy Dunlap <rdunlap@...radead.org>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:     linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] parport: Use more comon logging styles

On Mon, 2020-03-02 at 20:29 +0100, Helge Deller wrote:
> On 28.02.20 09:32, Joe Perches wrote:
> > Some of the logging can be poorly formatted because of unexpected
> > line breaks given printks without KERN_CONT that should be pr_cont.
[]
> > diff --git a/drivers/parport/parport_gsc.c b/drivers/parport/parport_gsc.c
[]
> > @@ -238,14 +238,14 @@ struct parport *parport_gsc_probe_port(unsigned long base,
> > 
> >  	priv = kzalloc (sizeof (struct parport_gsc_private), GFP_KERNEL);
> >  	if (!priv) {
> > -		printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base);
> > +		printk(KERN_DEBUG "parport (0x%lx): no memory!\n", base);
> 
> pr_warn() instead?

For all of your remarks, the intent here is to keep the
same output.

Logging level changes and printk(KERN_DEBUG -> pr_debug(
conversions cause the dmesg output to be different.

	printk(KERN_DEBUG...)

is always emitted when the console level allows but

	pr_debug(...)

is not normally compiled in at all.

So it's possible for all printk(KERN_DEBUG to be pr_debug
but that causes no logging at all to be emitted when
DEBUG is not defined or CONFIG_DYNAMIC_DEBUG not enabled.