linux-kernel - Re: [PATCH 3/5] mm: Add kmalloc NULL tests

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Date:	Thu, 30 Jul 2009 17:36:58 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Julia Lawall <julia@...u.dk>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 3/5] mm: Add kmalloc NULL tests

Hello Julia,

On Thu, Jul 30, 2009 at 04:10:22PM +0200, Julia Lawall wrote:

> diff --git a/mm/slab.c b/mm/slab.c
> index 7b5d4de..972e427 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -1502,6 +1502,7 @@ void __init kmem_cache_init(void)
>  
>  		ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
>  
> +		BUG_ON(!ptr);
>  		BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache);
>  		memcpy(ptr, cpu_cache_get(&cache_cache),
>  		       sizeof(struct arraycache_init));

This does not change the end result when the allocation fails: you get
a stacktrace and a kernel panic.  Leaving it as is saves a line of
code.

> @@ -1514,6 +1515,7 @@ void __init kmem_cache_init(void)
>  
>  		ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
>  
> +		BUG_ON(!ptr);
>  		BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep)
>  		       != &initarray_generic.cache);
>  		memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep),

	Hannes
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