Re: [patch 05/61] lock validator: introduce WARN_ON_ONCE(cond)

[Andrew Morton]

On Mon, 29 May 2006 23:23:28 +0200
Ingo Molnar <mingo@xxxxxxx> wrote:

> add WARN_ON_ONCE(cond) to print once-per-bootup messages.
> 
> Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
> Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
> ---
>  include/asm-generic/bug.h |   13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> Index: linux/include/asm-generic/bug.h
> ===================================================================
> --- linux.orig/include/asm-generic/bug.h
> +++ linux/include/asm-generic/bug.h
> @@ -44,4 +44,17 @@
>  # define WARN_ON_SMP(x)			do { } while (0)
>  #endif
>  
> +#define WARN_ON_ONCE(condition)				\
> +({							\
> +	static int __warn_once = 1;			\
> +	int __ret = 0;					\
> +							\
> +	if (unlikely(__warn_once && (condition))) {	\
> +		__warn_once = 0;			\
> +		WARN_ON(1);				\
> +		__ret = 1;				\
> +	}						\
> +	__ret;						\
> +})
> +
>  #endif

I'll queue this for mainline inclusion.
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