On Thu, Oct 5, 2017 at 6:52 PM, kbuild test robot <fengguang.wu@xxxxxxxxx> wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git topic/rcar-gen3-z-clk-v3 > head: 4b41ea6e92cdc7fce15ba99b02c40938a134cff7 > commit: fda8dbe29dd1f04b61c443147a106962cf5d3f14 [2/6] clk: renesas: rcar-gen3: Add Z2 clock divider support > config: i386-allmodconfig (attached as .config) > compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 > reproduce: > git checkout fda8dbe29dd1f04b61c443147a106962cf5d3f14 > # save the attached .config to linux build tree > make ARCH=i386 > > All errors (new ones prefixed by >>): > > drivers/clk/renesas/rcar-gen3-cpg.o: In function `cpg_z_clk_set_rate': >>> rcar-gen3-cpg.c:(.text+0x289): undefined reference to `__ffsdi2' This is caused by the use of __builtin_ffsll() in <linux/bitfield.h>. On several architectures, gcc generates a call to __ffsdi2(). This is the case on (non-exhaustive list): alpha arm32 avr32 bfin cris frv h8300 ia32 m32r m68k microblaze mn10300 mips32 mips64 openrisc parisc powerpc32 s390x sh4 sparc32 sparc64 unicore xtensa The following are OK: amd64 arm64 ia64 powerpc64 tilegx (but tile is the only one exporting the symbol to modules?) Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
