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Re: [PATCH 03/11] netfilter: don't use module_init/exit in core IPV4 code

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  Re: [PATCH 03/11] netfilter: don't use module_init/exit in core IPV4  code Pablo Neira Ayuso <pablo@netfilter.org> - 2015-06-03 18:00 +0200
    Re: [PATCH 03/11] netfilter: don't use module_init/exit in core IPV4  code Paul Gortmaker <paul.gortmaker@windriver.com> - 2015-06-03 18:20 +0200

#1157796 — 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@netfilter.org>
> Cc: Patrick McHardy <kaber@trash.net>
> Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: netfilter-devel@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

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

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

Thanks.
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#1157812

On 15-06-03 12:04 PM, Pablo Neira Ayuso wrote:
> 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@netfilter.org>
>> Cc: Patrick McHardy <kaber@trash.net>
>> Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
>> Cc: "David S. Miller" <davem@davemloft.net>
>> Cc: netfilter-devel@vger.kernel.org
>> Cc: netdev@vger.kernel.org
>> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
> 
> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
> 
> Or I can integrate this into the nf-next tree if you prefer it.

I need to keep it in my series to avoid introducing compile
fails into the bisect history, so I'll just add your Ack.

Thanks,
Paul.
--

> 
> Thanks.
> 
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