linux-kernel - Re: [PATCH 2.6.19 1/4] ehca: assure 4k alignment for firmware control block in 64k page mode

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Message-Id: <200611060045.59074.arnd@arndb.de>
Date:	Mon, 6 Nov 2006 00:45:58 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...abs.org
Cc:	Hoang-Nam Nguyen <hnguyen@...ibm.com>, rolandd@...co.com,
	raisch@...ibm.com, linux-kernel@...r.kernel.org,
	openib-general@...nib.org
Subject: Re: [PATCH 2.6.19 1/4] ehca: assure 4k alignment for firmware control block in 64k page mode

On Sunday 05 November 2006 21:40, Hoang-Nam Nguyen wrote:

> +/* constructor ctblk_cache */
> +void ehca_ctblk_ctor(void *ptr, kmem_cache_t *cache, unsigned long flags)
> +{
> + memset(ptr, 0, EHCA_PAGESIZE);
> +}
> +
> +void *ehca_alloc_fw_ctrlblock(void)
> +{
> + void *ret = kmem_cache_alloc(ctblk_cache, SLAB_KERNEL);
> + if (!ret)
> +  ehca_gen_err("Out of memory for ctblk");
> + return ret;
> +}
> +
> +void ehca_free_fw_ctrlblock(void *ptr)
> +{
> + if (ptr)
> +  kmem_cache_free(ctblk_cache, ptr);
> +

This seems broken. You have a constructor for newly allocated objects, but
there is no destructor and it seems that objects passed to
ehca_free_fw_ctrlblock are not guaranteed to be initialized either.

I'd simply move the memset into the alloc function and get rid of the
constructor here.

	Arnd <><
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