Re: drivers/gpu/drm/radeon/radeon_test.c:45: undefined reference to `__udivdi3'
From: Dave Hylands
Date: Sat Dec 19 2009 - 04:13:34 EST
Hi Jim,
On Fri, Dec 18, 2009 at 12:54 PM, Mr. James W. Laferriere
<babydr@xxxxxxxxxxxxxxxx> 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.
--
Dave Hylands
Shuswap, BC, Canada
http://www.DaveHylands.com/
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