linux-kernel - Re: [PATCH 2/3] Introduce VM_BUG_ON

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Date:	Fri, 29 Aug 2014 14:51:42 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	khlebnikov@...nvz.org, riel@...hat.com, mgorman@...e.de,
	mhocko@...e.cz, hughd@...gle.com, vbabka@...e.cz,
	walken@...gle.com, minchan@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/3] Introduce VM_BUG_ON_VMA

On Fri, Aug 29, 2014 at 10:54:18AM -0400, Sasha Levin wrote:
> Very similar to VM_BUG_ON_PAGE but dumps VMA information instead.
> 
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

> ---
>  include/linux/mmdebug.h |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
> index dfb9333..569e4c8 100644
> --- a/include/linux/mmdebug.h
> +++ b/include/linux/mmdebug.h
> @@ -20,12 +20,20 @@ void dump_vma(const struct vm_area_struct *vma);
>  			BUG();						\
>  		}							\
>  	} while (0)
> +#define VM_BUG_ON_VMA(cond, vma)					\
> +	do {								\
> +		if (unlikely(cond)) {					\
> +			dump_vma(vma);					\
> +			BUG();						\
> +		}							\
> +	} while (0)
>  #define VM_WARN_ON(cond) WARN_ON(cond)
>  #define VM_WARN_ON_ONCE(cond) WARN_ON_ONCE(cond)
>  #define VM_WARN_ONCE(cond, format...) WARN_ONCE(cond, format)
>  #else
>  #define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
>  #define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
> +#define VM_BUG_ON_VMA(cond, vma) VM_BUG_ON(cond)
>  #define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
>  #define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
>  #define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
> -- 
> 1.7.10.4
> 
> --
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