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

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Message-ID: <1311000648.2286.66.camel@Joe-Laptop>
Date:	Mon, 18 Jul 2011 07:50:48 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Bart Van Assche <bvanassche@....org>, jim.cromie@...il.com,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 11/11 re-post] dynamic_debug: use a single printk() to
 emit msgs

On Mon, 2011-07-18 at 10:30 -0400, Jason Baron wrote:
> On Fri, Jul 15, 2011 at 04:46:31PM -0700, Joe Perches wrote:
> > On Fri, 2011-07-15 at 15:59 -0400, Jason Baron wrote:
> > > diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
> > > +#define LEFT(wrote) ((PREFIX_SIZE - wrote) > 0) ? (PREFIX_SIZE - wrote) : 0
[]
> > > +	pos += snprintf(buf + pos, LEFT(pos), "%s", KERN_DEBUG);
> > > +	if (desc->flags & _DPRINTK_FLAGS_INCL_TID) {
> > >  		if (in_interrupt())
> > > -			snprintf(tid, sizeof(tid), "%s", "<intr> ");
> > > +			pos += snprintf(buf + pos, LEFT(pos), "%s ",
> > > +						"<intr>");
> > scnprintf works without using LEFT.
> > snprintf does as well.
> > http://lkml.org/lkml/2010/7/23/375
> So you're saying, just pass (PREFIX_SIZE - pos), as the second argument?

Yes.

> I see kernel code written both ways.

Perhaps one consistently used style is better than two.
 
> I think it's fine as written, unless you feel
> strongly about this.

You're the maintainer, do what you think best.

cheers, Joe

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