I'm facing a kernel build issue with the latest kernel on my machine. It seem like a configuration issue, and I haven't been able to resolve it for sometime, hence need your help. The error message is as below: <error snip> ERROR: "copy_from_user_overflow" [net/core/pktgen.ko] undefined! ERROR: "copy_from_user_overflow" [fs/binfmt_misc.ko] undefined! ERROR: "copy_from_user_overflow" [drivers/staging/cxt1e1/cxt1e1.ko] undefined! ERROR: "copy_from_user_overflow" [drivers/isdn/icn/icn.ko] undefined! ERROR: "copy_from_user_overflow" [drivers/isdn/hardware/avm/b1.ko] undefined! <error snip> The subroutine "copy_from_user_overflow" is defined in lib/usercopy.c, and the 'Makefile' in the lib directory looks something like this: <snip from lib/Makefile> lib-$(CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS) += usercopy.o <snip from lib/Makefile> I think that this config option should be a built-in ('y') and I see that this config option is indeed set to 'y' in the .config file. <snip from .config> amit@ubuntu:~/linux-next/linux-next$ grep CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS .config CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS=y <snip from .config> So what am I missing here ? Some information about my git tree: amit@ubuntu:~/linux-next/linux-next$ git remote show origin * remote origin Fetch URL: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git amit@ubuntu:~/linux-next/linux-next$ git tag -l next-*|tail -n 1 next-20130314 <--- latest tag amit@ubuntu:~/linux-next/linux-next$ git branch * 15-March <--- -- branch based on the latest tag 22-Feb-13 -Amit _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies