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Re: [PATCH v2] compat: deal with backported codel

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On 08/06/2012 09:53 PM, Luis R. Rodriguez wrote:
> On Sun, Aug 5, 2012 at 3:29 AM, Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:
>> From: Johannes Berg <johannes.berg@xxxxxxxxx>
>>
>> Some distro kernels (in particular the Debian 3.2.0-3
>> kernel I'm running) backport codel already, so trying
>> to backport it again causes issues. Protect the compat
>> backport with #ifdef TCA_CODEL_MAX.
>>
>> Also link the flow_dissector code into the codel module
>> which then won't be loaded on kernels that already have
>> codel backported.
>>
>> Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
> 
> Applied and pushed, thanks!
> 
>   Luis
> 
This breaks my build if net/codel.h is not in the kernel headers:

In file included from
/home/hauke/compat-wireless/compat-wireless/compat/sch_fq_codel_core.c:27:0:
/home/hauke/compat-wireless/compat-wireless/include/net/codel.h:5:28:
fatal error: net/codel.h: No such file or directory
compilation terminated.

TCA_CODEL_MAX is defined in include/linux/compat-3.5.h and this file is
included ever time, so the check around #include_next <net/codel.h> is
never false.

You could define something like COMPAT_CODEL_BACKPORT in
include/linux/compat-3.5.h and extend the check in include/net/codel.h
that this has to be unset.

Hauke
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