linux-kernel - Re: [patch 10/15] fs/logfs/memtree.c

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Message-Id: <200804101607.45409.arnd@arndb.de>
Date:	Thu, 10 Apr 2008 16:07:44 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	joern@...fs.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mtd@...ts.infradead.org
Subject: Re: [patch 10/15] fs/logfs/memtree.c

On Tuesday 01 April 2008, joern@...fs.org wrote:
> +#if BITS_PER_LONG == 32
> +#define BTREE_NODES 20 /* 32bit, 240 byte nodes */
> +#else
> +#define BTREE_NODES 16 /* 64bit, 256 byte nodes */
> +#endif
> +
> +struct btree_node {
> +       u64 key;
> +       struct btree_node *node;
> +};

On 32 bit platforms other than x86, your struct btree_node
is 16 bytes long because of alignment requirements, rather
than the 12 bytes you are assuming.

	Arnd <><
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