linux-kernel - Re: [PATCH] printk: Use symbolic defines for console loglevels

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Message-ID: <20140519192501.GD6311@pd.tnic>
Date:	Mon, 19 May 2014 21:25:01 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Joe Perches <joe@...ches.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...radead.org>, x86@...nel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net, Hedi Berriche <hedi@....com>,
	Mike Travis <travis@....com>,
	Dimitri Sivanich <sivanich@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Kees Cook <keescook@...omium.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] printk: Use symbolic defines for console loglevels

On Mon, May 19, 2014 at 12:12:51PM -0700, Joe Perches wrote:
> On Mon, 2014-05-19 at 20:27 +0200, Borislav Petkov wrote:
> > ... instead of naked numbers.
> 
> Seems sensible.
> 
> > diff --git a/include/linux/printk.h b/include/linux/printk.h
> []
> > @@ -30,6 +30,17 @@ static inline const char *printk_skip_level(const char *buffer)
> >  	return buffer;
> >  }
> >  
> > +/* printk's without a loglevel use this.. */
> > +#define DEFAULT_MESSAGE_LOGLEVEL CONFIG_DEFAULT_MESSAGE_LOGLEVEL
> 
> Does anyone actually set CONFIG_DEFAULT_MESSAGE_LOGLEVEL
> to something other than 4?
> 
> > +/* We show everything that is MORE important than this.. */
> 
> It might be nice to show somewhere that larger values are
> less important.
> 
> > +#define CONSOLE_LOGLEVEL_SILENT  0 /* Mum's the word */
> > +#define CONSOLE_LOGLEVEL_MIN	 1 /* Minimum loglevel we let people use */
> > +#define CONSOLE_LOGLEVEL_QUIET	 4 /* Shhh ..., when booted with "quiet" */
> > +#define CONSOLE_LOGLEVEL_DEFAULT 7 /* anything MORE serious than KERN_DEBUG */
> > +#define CONSOLE_LOGLEVEL_DEBUG	10 /* issue debug messages */
> > +#define CONSOLE_LOGLEVEL_MOTORMOUTH 15	/* You can't shut this one up */
> 
> It may be nicer to have #defines for the
> KERN_<LEVEL> numbers from kern_levels.h
> and use those here.
> 
> Maybe add:
> 
> #define LOGLEVEL_EMERG		0
> #define LOGLEVEL_ALERT		1
> #define LOGLEVEL_CRIT		2
> #define LOGLEVEL_ERR		3
> #define LOGLEVEL_WARNING	4
> #define LOGLEVEL_NOTICE		5
> #define LOGLEVEL_INFO		6
> #define LOGLEVEL_DEBUG		7
> 
> That could clean up a few uses of
> magic numbers like 7 in dev_printk_emit

This patch is supposed to be as obvious as possible - all other things
which need/must/will be done should come ontop, not here.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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