linux-kernel - Re: [PATCH 11/11] dynamic_debug: use a single printk() to emit msgs

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Message-ID: <20110715160417.GB2493@redhat.com>
Date:	Fri, 15 Jul 2011 12:04:18 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Bart Van Assche <bvanassche@....org>
Cc:	Joe Perches <joe@...ches.com>, gregkh@...e.de,
	jim.cromie@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/11] dynamic_debug: use a single printk() to emit msgs

On Fri, Jul 15, 2011 at 05:57:11PM +0200, Bart Van Assche wrote:
> On Fri, Jul 15, 2011 at 5:48 PM, Joe Perches <joe@...ches.com> wrote:
> > On Fri, 2011-07-15 at 12:05 +0200, Bart Van Assche wrote:
> >> Not that's it important, but this change makes is possible to
> >> eliminate the tid[] and lineno[] arrays again. Has that been
> >> considered ?
> >
> > tid and lineno are decimal.  Not using intermediate
> > arrays would require awkward contortions to snprintf
> > them without emitting 0 in the output.
> 
> Sorry, but I do not agree with the above. The current implementation
> of __dynamic_pr_debug() shows that an implementation without temporary
> arrays does not require any awkward constructs. See e.g.
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=lib/dynamic_debug.c
> for the source code of the current implementation of
> __dynamic_pr_debug().
> 
> This may be subjective, but my opinion is that following that style
> results in shorter and more elegant code than the approach with the
> temporary arrays proposed in patch 11/11.
> 
> Bart.

yes, but that approach uses 'KERN_CONT'. The point of patch 11/11 is to get rid
of KERN_CONT, which is racy. 

Thanks,

-Jason
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