linux-kernel - Re: [patch 2/17] Add a WARN() macro that acts like WARN

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Date:	Fri, 11 Jul 2008 13:51:43 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: [patch 2/17] Add a WARN() macro that acts like WARN_ON()+printk

On Fri, 11 Jul 2008 12:19:49 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Tue, 8 Jul 2008 09:40:23 -0700 Arjan van de Ven
> <arjan@...radead.org> wrote:
> 
> > From: Arjan van de Ven <arjan@...ux.intel.com>
> > 
> > Add a WARN() macro that acts like WARN_ON(), with the added feature
> > that it takes a printk like argument that is printed as part of the
> > warning message.
> > 
> 
> Apart from a little whitespace tweak, this is identical to what I
> already had.
> 
> > +#define WARN_ONCE(condition, format...)
> > ({			\
> > +	static int
> > __warned;					\
> > +	int __ret_warn_once
> > = !!(condition);			\
> > +								\
> > +	if
> > (unlikely(__ret_warn_once))				\
> > +		if (WARN(!__warned, format))
> > 			\
> > +			__warned =
> > 1;				\
> > +	unlikely(__ret_warn_once);				\
> > +})
> 
> Except it adds this operation, without describing it at all in the
> changelog.
> 
> Is this some brainfart, or am I missing something?  I can see some
> sense in a WARN_ONCE(format...), but not in a WARN_ONCE() which takes
> a `condition' and should be called WARN_ON_ONCE(), which we already
> have.

WARN_ON_ONCE() doesn't take printk arguments. So WARN_ONCE() is
WAR_ON_ONCE() with printk arguments...


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