linux-kernel - Re: [PATCH] constify tables in kernel/sysctl

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Date:	Fri, 21 Dec 2007 07:47:55 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] constify tables in kernel/sysctl_check.c

>>> Eric W. Biederman <ebiederm@...ssion.com> 21.12.07 00:05 >>>
>"Jan Beulich" <jbeulich@...ell.com> writes:
>
>> Remains the question whether it is intended that many, perhaps even
>> large, tables are compiled in without ever having a chance to get used,
>> i.e. whether there shouldn't #ifdef CONFIG_xxx get added.
>
>
>The constification looks good.  The file should be compiled only when
>we have sysctl support.  We use those tables when we call 
>register_sysctl_table.  Which we do a lot.

I understand this. Nevertheless, the tables take 23k on 64-bits, and many
of them are unused when certain subsystems aren't being built (and some
are even architecture specific). The arlan tables are a particularly good
example, but the netfilter ones are pretty big and probably not always
used, too.

Jan

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