Re: iptables not working with monolithic 2.6.26.5 kernel on ARM

[Patrick McHardy <kaber@trash.net>]

Jan Engelhardt wrote:
> On Sunday 2008-10-05 09:24, Patrick McHardy wrote:
>> Jan Engelhardt wrote:
>>> You can change the XT_ALIGN macro in the
>>> kernel/include/linux/netfilter/x_tables.h and
>>> iptables/include/linux/netfilter/x_tables.h to read
>>>
>>>  #ifndef roundup
>>>  #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
>>>  #endif
>>>  #define XT_ALIGN(s) roundup(s, sizeof(uint64_t))
>>>
>>> and try again. There might be more alignment issues hiding, so
>>> don't expect it to fix it all in a magic whizz.
>> An idea to avoid these problems in the future would be to change
>> the kernel so it accepts stricter alignment than what we currently
>> use and after a grace period (maybe 1-2 years) change XT_ALIGN in
>> userspace so it starts using u64 or simply 8 byte alignment
>> everywhere.
> 
> I'd rather be interested in what architectures actually have
> alignof(uint64_t) == 4, besides the native ARM gcc that's used here.

CRIS isn't requiring any alignment AFAIK, so everything is just
byte aligned. I don't know about any other architectures not
using 8 byte alignment.