Re: [renesas:topic/rcar-gen3-z-clk-v3 2/6] rcar-gen3-cpg.c:undefined reference to `__ffsdi2'

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On Mon, Oct 9, 2017 at 10:02 AM, Geert Uytterhoeven
<geert@xxxxxxxxxxxxxx> wrote:
> 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?)

(now I had my morning coffee)

Ah, <linux/bitfield.h> could just use __ffs64() + 1 instead.
Will send a patch...

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



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