linux-kernel - Re: checkpatch and kernel/sched.c

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Message-Id: <20071001003949.d5c9563e.akpm@linux-foundation.org>
Date:	Mon, 1 Oct 2007 00:39:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Andy Whitcroft <apw@...dowen.org>,
	linux-kernel@...r.kernel.org
Subject: Re: checkpatch and kernel/sched.c

On Mon, 01 Oct 2007 09:48:25 +0200 Avi Kivity <avi@...ranet.com> wrote:

> Andrew Morton wrote:
> >> this is actually a false positive - as the debug code constructs a 
> >> printk output _without_ \n. So the script should check whether there's 
> >> any \n in the printk string - if there is none, do not emit a warning. 
> >> (if you implement that then i think it can remain a warning and does not 
> >> need to move to CHECK.)
> >>     
> >
> > Yeah, it does that sometimes.  I don't think it's fixable within the scope
> > of checkpatch.  It needs to check whether some preceding printk which might
> > not even be in the patch has a \n:
> >
> > 	printk(KERN_ERR "foo");
> > 	<100 lines of whatever>
> > +	printk("bar\n");
> >
> > we're screwed...
> >
> >   
> 
> Isn't that broken on SMP (or with preemption) anyway?

Yep.  Or with interrupts...
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