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Date: Sun, 9 Mar 2003 23:45:52 +0100
From: "J.A. Magallon" <jamagallon@able.es>
To: linux-kernel@vger.kernel.org
Cc: Dave Jones <davej@codemonkey.org.uk>
Subject: Re: Fwd: struct inode size reduction.
Message-ID: <20030309224552.GA3047@werewolf.able.es>
References: <20030309135402.GB32107@suse.de>
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On 03.09, Dave Jones wrote:
> Third retry, perhaps it'll make it through to the list
> now that vger is sending mail again...
> 

If you do not need gcc-2.95 support, you can use anonymous unions:

+	union {
+		struct pipe_inode_info	*i_pipe;
+		struct block_device	*i_bdev;
+		struct char_device	*i_cdev;
+	};

so you don't even have to change the accesses. Zero cost optimization patch.

I have tested on gcc-3.0, 3.2.2, RH gcc-2.96-98, and 2.95.2. Only 2.95.2
fails.

I do not know the compiler requirements for 2.5, or if there is any agreement
in kernel developement for not doing this. If this is the case, sorry for
the noise.

-- 
J.A. Magallon <jamagallon@able.es>      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.1 (Cooker) for i586
Linux 2.4.21-pre5-jam0 (gcc 3.2.2 (Mandrake Linux 9.1 3.2.2-3mdk))
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