linux-kernel - Re: [PATCH] [2/3] add WARN_ON

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Date:	Tue, 11 Mar 2008 20:20:37 +0100
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH] [2/3] add WARN_ON_SECS macro

On Mon, Mar 10, 2008 at 02:34:37PM +0800, Dave Young wrote:
> Add WARN_ON_SECS macro for some serious case which need repeat the
> warnings, but with some ratelimit.
> 
> Signed-off-by: Dave Young <hidave.darkstar@...il.com>
> 
> ---
> include/asm-generic/bug.h |    8 ++++++++
> 1 file changed, 8 insertions(+)
> 
> diff -upr linux/include/asm-generic/bug.h linux.new/include/asm-generic/bug.h
> --- linux/include/asm-generic/bug.h	2008-03-10 13:27:03.000000000 +0800
> +++ linux.new/include/asm-generic/bug.h	2008-03-10 13:27:14.000000000 +0800
> @@ -3,6 +3,7 @@
>  
>  #include <linux/compiler.h>
>  
> +
>  #ifdef CONFIG_BUG
>  
>  #ifdef CONFIG_GENERIC_BUG
> @@ -75,6 +76,13 @@ extern void warn_on_slowpath(const char 
>  	unlikely(__ret_warn_once);				\
>  })
>  
> +#define WARN_ON_SECS(condition, secs) ({			\
> +	int __ret_warn_on = !!(condition);			\
> +	if (unlikely(__ret_warn_on))				\
> +		if (__ratelimit(secs * HZ, 1))			\
> +			WARN_ON(condition);			\
> +})
> +
>  #ifdef CONFIG_SMP
>  # define WARN_ON_SMP(x)			WARN_ON(x)
>  #else

Do you really want to check the condition twice?

Marcin
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