linux-kernel - Re: [PATCH 03/11] netfilter: don't use module

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Message-ID: <20150603160429.GA3565@salvia>
Date:	Wed, 3 Jun 2015 18:04:29 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	linux-kernel@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 03/11] netfilter: don't use module_init/exit in core IPV4
 code

On Sun, May 31, 2015 at 08:54:04PM -0400, Paul Gortmaker wrote:
> The file net/ipv4/netfilter.o is created based on whether
> CONFIG_NETFILTER is set.  However that is defined as a bool, and
> hence this file with the core netfilter hooks will never be
> modular.  So using module_init as an alias for __initcall can be
> somewhat misleading.
> 
> Fix this up now, so that we can relocate module_init from
> init.h into module.h in the future.  If we don't do this, we'd
> have to add module.h to obviously non-modular code, and that
> would be a worse thing.  Also add an inclusion of init.h, as
> that was previously implicit here in the netfilter.c file.
> 
> Note that direct use of __initcall is discouraged, vs. one
> of the priority categorized subgroups.  As __initcall gets
> mapped onto device_initcall, our use of subsys_initcall (which
> seems to make sense for netfilter code) will thus change this
> registration from level 6-device to level 4-subsys (i.e. slightly
> earlier).  However no observable impact of that small difference
> has been observed during testing, or is expected. (i.e. the
> location of the netfilter messages in dmesg remains unchanged
> with respect to all the other surrounding messages.)
> 
> As for the module_exit, rather than replace it with __exitcall,
> we simply remove it, since it appears only UML does anything
> with those, and even for UML, there is no relevant cleanup
> to be done here.
> 
> Cc: Pablo Neira Ayuso <pablo@...filter.org>
> Cc: Patrick McHardy <kaber@...sh.net>
> Cc: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: netfilter-devel@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

Acked-by: Pablo Neira Ayuso <pablo@...filter.org>

Or I can integrate this into the nf-next tree if you prefer it.

Thanks.
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