On Sun, Oct 4, 2015 at 9:34 PM, Arnd Bergmann <[email protected]> wrote:
> On Saturday 03 October 2015 21:15:46 Ksenija Stanojević wrote:
>> On Thu, Oct 1, 2015 at 10:05 PM, Arnd Bergmann <[email protected]> wrote:
>> > On Thursday 01 October 2015 19:44:46 Ksenija Stanojević wrote:
>> >>
>> >> In my local repository I modified my .config file so that CONFIG_64BIT
>> >> is not set,
>> >> and after that I recompiled all directory, but I don't get any 
>> >> errors/warning at
>> >> compile-time.
>> >> Also I separetly compiled this specific file but still no warnings
>> >> My .config  looks something like this:
>> >>
>> >> . . .
>> >>
>> >> Should I change my working kernel or .config file is just enough?
>> >
>> > I think the problem is that you only compiled that directory but did
>> > not attempt to do a full rebuild of the kernel and modules, which is
>> > required to catch link-time errors.
>> >
>> > The compiler does not know at this point that the 64-bit division function
>> > is undefined in the kernel, you only get a warning at the 'make vmlinux'
>> > link stage (for built-in drivers) or the 'make modules' modpost stage
>> > afterwards.
>>
>> I rebuilded my repository with:
>> make vmlinux
>> make modules
>> but I still don't get any warnings.
>> Do you have any other suggestion on what I'm doing wrong?
>
> I just tried it on my machine and I get (for an ARM build)
>
> $ make -skj30
> ERROR: "__aeabi_ldivmod" [drivers/staging/fbtft/fbtft.ko] undefined!

I got this error:
ERROR: "__divdi3" [drivers/staging/fbtft/fbtft.ko] undefined!

I suppose that divdi3 is division used for long long by gcc on x86


Ksenija
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