linux-kernel - Re: [PATCH] Use vprintk rather that vsnprintf where possible

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Message-ID: <20081205031312.GA1381@mail.local.tull.net>
Date:	Fri, 5 Dec 2008 14:13:12 +1100
From:	Nick Andrew <nick@...k-andrew.net>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Use vprintk rather that vsnprintf where possible

On Fri, Dec 05, 2008 at 04:05:06AM +0100, Kay Sievers wrote:
> On Thu, Dec 4, 2008 at 21:41, Matt Mackall <mpm@...enic.com> wrote:
> > This does away with lots of large static and on-stack buffers as well
> > as a few associated locks.
> 
> > -               len = snprintf(s, 256, KERN_DEBUG "%s: ", prefix);
> > -
> >                va_start(args, fmt);
> > -               len += vsnprintf(&s[len], (256 - len), fmt, args);
> > +               printk(KERN_DEBUG "%s: ", prefix);
> > +               vprintk(fmt, args);
> 
> If we convert to two printk calls for a single line, does that not
> possibly get mixed up with printks from other locations and lead to
> hardly readable log output?

That's right.

Nick.
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