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 -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
![]() |