netdev - Re: [PATCH] proc

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Date:	Sun, 28 Oct 2007 11:43:50 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Russell King <rmk+lkml@....linux.org.uk>
cc:	Joe Perches <joe@...ches.com>,
	Alexey Dobriyan <adobriyan@...il.com>, akpm@...l.org,
	torvalds@...l.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH] proc_fs.h redux


On Oct 28 2007 10:34, Russell King wrote:
>On Sat, Oct 27, 2007 at 03:40:04PM -0700, Joe Perches wrote:
>> and forward declarations of
>> 
>> struct proc_dir_entry;
>> struct file_operations;
>> 
>> As a general rule, I think it better to use includes
>> than use naked forward declarations.
>
>If you go down that route, you end up with _lots_ of circular
>dependencies - header file X needs Y needs Z which needs X.  We've
>been there, several times.  It very quickly becomes quite
>unmaintainable - you end up with hard to predict behaviour from
>include files.
>
>The only realistic solution is to use forward declarations.

Especially because it reduces the amount of I/O that needs to be done.

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