linux-kernel - Re: tty_init_dev: 24 callbacks suppressed

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Message-ID: <20121004131101.GA245@x4>
Date:	Thu, 4 Oct 2012 15:11:01 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Borislav Petkov <bp@...64.org>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: tty_init_dev: 24 callbacks suppressed

On 2012.10.04 at 14:40 +0200, Borislav Petkov wrote:
> On Thu, Oct 04, 2012 at 01:51:57PM +0200, Markus Trippelsdorf wrote:
> > diff --git a/include/linux/ratelimit.h b/include/linux/ratelimit.h
> > index e11ccb4..d8de255 100644
> > --- a/include/linux/ratelimit.h
> > +++ b/include/linux/ratelimit.h
> > @@ -46,20 +46,17 @@ extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
> >  #define WARN_ON_RATELIMIT(condition, state)			\
> >  		WARN_ON((condition) && __ratelimit(state))
> >  
> > -#define __WARN_RATELIMIT(condition, state, format...)		\
> > -({								\
> > -	int rtn = 0;						\
> > -	if (unlikely(__ratelimit(state)))			\
> > -		rtn = WARN(condition, format);			\
> > -	rtn;							\
> > -})
> > -
> > -#define WARN_RATELIMIT(condition, format...)			\
> > +#define WARN_RATELIMIT(condition, fmt, ...)			\
> >  ({								\
> >  	static DEFINE_RATELIMIT_STATE(_rs,			\
> >  				      DEFAULT_RATELIMIT_INTERVAL,	\
> >  				      DEFAULT_RATELIMIT_BURST);	\
> > -	__WARN_RATELIMIT(condition, &_rs, format);		\
> > +	int rtn = !!(condition);				\
> > +								\
> > +	if (unlikely(rtn && __ratelimit(&_rs)))		\
> > +		WARN(rtn, fmt, ##__VA_ARGS__);			\
> > +								\
> > +	rtn;							\
> >  })
> 
> Aha, I see it. We need to look at the condition before the __ratelimit,
> otherwise we WARN unnecessarily, good catch.
> 
> >  #else
> > @@ -67,15 +64,9 @@ extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
> >  #define WARN_ON_RATELIMIT(condition, state)			\
> >  	WARN_ON(condition)
> >  
> > -#define __WARN_RATELIMIT(condition, state, format...)		\
> > -({								\
> > -	int rtn = WARN(condition, format);			\
> > -	rtn;							\
> > -})
> > -
> > -#define WARN_RATELIMIT(condition, format...)			\
> > +#define WARN_RATELIMIT(condition, fmt, ...)			\
> 
> ... except this change is unrelated and unneeded - there's enough room
> in 80 cols to leave it as "format" instead of shortening it.
> 
> Other than that:
> 
> Acked-and-tested-by: Borislav Petkov <borislav.petkov@....com>

I'll let Jiri handle this :). It's his patch anyway.

-- 
Markus
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