linux-kernel - Re: [PATCH -mm] do not check condition twice in WARN_ON

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Message-ID: <87pru0oxyv.fsf@saeurebad.de>
Date:	Wed, 12 Mar 2008 14:47:52 +0100
From:	Johannes Weiner <hannes@...urebad.de>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Marcin Slusarz <marcin.slusarz@...il.com>,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH -mm] do not check condition twice in WARN_ON_SECS

Hi Dave,

Dave Young <hidave.darkstar@...il.com> writes:

> Don't check condition twice, change WARN_ON(condition) to WARN_ON(1)
> Thanks Marcin Slusarz <marcin.slusarz@...il.com> for pointing out
>
> Signed-off-by: Dave Young <hidave.darkstar@...il.com>
>
> ---
> include/asm-generic/bug.h |    3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff -upr linux/include/asm-generic/bug.h linux.new/include/asm-generic/bug.h
> --- linux/include/asm-generic/bug.h	2008-03-12 08:45:08.000000000 +0800
> +++ linux.new/include/asm-generic/bug.h	2008-03-12 09:04:07.000000000 +0800
> @@ -80,7 +80,8 @@ extern void warn_on_slowpath(const char 
>  	int __ret_warn_on = !!(condition);			\
>  	if (unlikely(__ret_warn_on))				\
>  		if (__ratelimit(secs * HZ, 1))			\
> -			WARN_ON(condition);			\
> +			WARN_ON(1);				\
> +	unlikely(__ret_warn_on);				\
>  })

What's wrong with:

#define WARN_ON_SECS(condition, secs) \
	WARN_ON(condition && __ratelimit(secs * HZ, 1))

?

	Hannes
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