linux-kernel - Re: [PATCH] unlock before bug returns

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Message-ID: <84144f020710220540i7be08eednf40db8367669825f@mail.gmail.com>
Date:	Mon, 22 Oct 2007 15:40:44 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Roel Kluin" <12o3l@...cali.nl>
Cc:	"Rik van Riel" <riel@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Christoph Lameter" <clameter@....com>
Subject: Re: [PATCH] unlock before bug returns

Hi Roel,

On 10/22/07, Roel Kluin <12o3l@...cali.nl> wrote:
> diff --git a/mm/slab.c b/mm/slab.c
> index cfa6be4..20c58dc 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -1606,8 +1606,10 @@ void __init kmem_cache_init(void)
>                 struct kmem_cache *cachep;
>                 mutex_lock(&cache_chain_mutex);
>                 list_for_each_entry(cachep, &cache_chain, next)
> -                       if (enable_cpucache(cachep))
> +                       if (enable_cpucache(cachep)) {
> +                               mutex_unlock(&cache_chain_mutex);
>                                 BUG();
> +                       }
>                 mutex_unlock(&cache_chain_mutex);
>         }

NAK. This will cause double-unlock when CONFIG_BUG is disabled. It's
incorrect to assume that BUG() will always terminate the current
process.
-
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