Re: [PATCH] Frontswap: fix the condition in BUG_ON

[Konrad Rzeszutek Wilk]

On Fri, Oct 31, 2014 at 06:14:19PM +0800, Li Haifeng wrote:
> >From 012a564c7210346b99d12e3d2485542bb090586e Mon Sep 17 00:00:00 2001
> From: Haifeng Li <omycle@xxxxxxxxx>
> Date: Fri, 31 Oct 2014 17:40:44 +0800
> Subject: [PATCH] Frontswap: fix the condition in BUG_ON
> 
> The largest index of swap device is MAX_SWAPFILES-1. So the type
> should be less than MAX_SWAPFILES.

Ok, so we would never hit this BUG_ON because of that.

Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

P.S.
Andrew - are you OK picking this up?

Thank you!
> 
> Signed-off-by: Haifeng Li <omycle@xxxxxxxxx>
> ---
>  mm/frontswap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/frontswap.c b/mm/frontswap.c
> index c30eec5..1b80c05 100644
> --- a/mm/frontswap.c
> +++ b/mm/frontswap.c
> @@ -182,7 +182,7 @@ void __frontswap_init(unsigned type, unsigned long *map)
>         if (frontswap_ops)
>                 frontswap_ops->init(type);
>         else {
> -               BUG_ON(type > MAX_SWAPFILES);
> +               BUG_ON(type >= MAX_SWAPFILES);
>                 set_bit(type, need_init);
>         }
>  }
> -- 
> 1.9.1
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