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SubjectRe: drivers/gpu/drm/radeon/radeon_test.c:45: undefined reference to `__udivdi3'
 	Hello Dave ,

On Sat, 19 Dec 2009, Dave Hylands wrote:
> Hi Jim,
> On Fri, Dec 18, 2009 at 12:54 PM, Mr. James W. Laferriere
> <babydr@baby-dragons.com> wrote:
>>        Hello Benjamin ,  I am not having a good time compiling 2.6.32.1 .
>> First RCU 'inline' difficulties then fusion-mpt 'inline' difficulty ,  Now
>> this .
>>        This one is not a simple as removing 'inline' from a statement .
>>        Would you please look into this ?  Anything else you need please just
>> ask .
>>        Please cc: me as I am not subscribed to linux-fbdev .
>>
>>                Tia ,  JimL
>>
> ...snip...
>> drivers/built-in.o(.text+0x11345a): In function `radeon_test_moves':
>> drivers/gpu/drm/radeon/radeon_test.c:45: undefined reference to `__udivdi3'
>> make: *** [.tmp_vmlinux1] Error 1
>
> __udivdi3 is a gcc helper function used to do 64-bit division. This
> form of 64-bit division is not supported from within the kernel (which
> is why you get the undefined symbol).
>
> There is <asm/div64.h> which contains a macro called do_div which can
> perform a 64-bit dvision by a 32-bit divisor.
Thank you , For replying . Now I being a kernel level nothing , How
does this help me get past the 'ld' time undefined reference ? So we can have
a kernel build complete (hopefully) successfully .

I've another ? as well how is it that the drm/radeon_test.c is using
(well at least referencing) a non-kernel symbol ? That alone is rather
interesting .

But all I had to do is Disable DRM in the kernel . Since this system is
a remote device without a real need for DRI/DRM support that should cure my
problem . But someone else is going to need that support & I am sure they'll
hit that same bug .

Tia , JimL
--
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| James W. Laferriere | System Techniques | Give me VMS |
| Network&System Engineer | 3237 Holden Road | Give me Linux |
| babydr@baby-dragons.com | Fairbanks, AK. 99709 | only on AXP |
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