linux-kernel - Re: drivers/gpu/drm/radeon/radeon_test.c:45: undefined reference to `_

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Message-ID: <c32efac40912190113i5292a395tcc257c16a4870f3b@mail.gmail.com>
Date:	Sat, 19 Dec 2009 01:13:11 -0800
From:	Dave Hylands <dhylands@...il.com>
To:	"Mr. James W. Laferriere" <babydr@...y-dragons.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-fbdev@...r.kernel.org,
	Linux Kernel Maillist <linux-kernel@...r.kernel.org>
Subject: Re: drivers/gpu/drm/radeon/radeon_test.c:45: undefined reference to 
	`__udivdi3'

Hi Jim,

On Fri, Dec 18, 2009 at 12:54 PM, Mr. James W. Laferriere
<babydr@...y-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.

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.DaveHylands.com/
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