Yiee... lexer/parser problem in genksyms. cc'ing Andreas, Sam and Jan
for help and quoting whole body.
Hello,
Tejun Heo wrote:
> Hello,
>
> Luck, Tony wrote:
>> Ok. x86 doesn't see this because the defconfig has
>> CONFIG_MODVERSIONS is not set
>>
>> If I turn MODVERSION off, then the problem disappears for me.
>>
>> If I turn MODVERSIONS on for x86 (and fudge a driver to make use of
>> softirq_work_list), then x86 gets the CRC warning too.
>
> Right, I can reproduce it here too.
>
>> So this isn't a tool chain problem. Neither x86 nor ia64
>> can handle exported per-cpu array objects when CONFIG_MODVERSIONS
>> is set.
>>
>> Looking at the __crc symbols in the vmlinux for x86 with
>> CONFIG_MODVERSIONS=y I see:
>>
>> 000000006dcaeb88 A __crc_per_cpu__kernel_stack
>> 00000000b3994c7a A __crc_per_cpu__kstat
>> 00000000d917c158 A __crc_per_cpu__node_number
>> w __crc_per_cpu__softirq_work_list
>> 0000000036a1f502 A __crc_per_cpu__softnet_data
>> 0000000057adf756 A __crc_per_cpu__this_cpu_off
>>
>> which explains why "modpost" is unable to find a CRC.
>>
>> Maybe the comments in <linux/module.h> are supposed to be a
>> clue? :
>>
>> #ifdef CONFIG_MODVERSIONS
>> /* Mark the CRC weak since genksyms apparently decides not to
>> * generate a checksums for some symbols */
>> #define __CRC_SYMBOL(sym, sec) \
>> extern void *__crc_##sym __attribute__((weak)); \
>> static const unsigned long __kcrctab_##sym \
>> __used \
>> __attribute__((section("__kcrctab" sec), unused)) \
>> = (unsigned long) &__crc_##sym;
>>
>> But not enough of a clue for me :-(
>
> I have no idea either. I'll dig a bit and try to find out what's
> going on.
So, the problem is that genksyms can't understand the following.
__typeof__(int [10]) my_ar;
EXPORT_SYMBOL(my_ar);
Would it be difficult to teach it how to parse it?
Thanks.
--
tejun
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