linux-kernel - Fwd: Linker error on 2.6.32.2 with radeon DRM

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Date:	Sun, 20 Dec 2009 16:14:46 +0100
From:	Andrea Merello <andrea.merello@...il.com>
To:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Fwd: Linker error on 2.6.32.2 with radeon DRM

I just tried to compile last stable kernel with radeon DRM gpu driver
and I got this:

...
 LD      vmlinux.o
 MODPOST vmlinux.o
 GEN     .version
 CHK     include/linux/compile.h
 UPD     include/linux/compile.h
 CC      init/version.o
 LD      init/built-in.o
 LD      .tmp_vmlinux1
drivers/built-in.o(.text+0xf633a): In function `radeon_test_moves':
: undefined reference to `__udivdi3'
make: *** [.tmp_vmlinux1] Error 1
user@...quiri:~/linux-2.6.32.2>

user@...quiri:~/linux-2.6.32.2> gcc -v
Reading specs from /usr/lib/gcc-lib/i586-suse-linux/3.3.5/specs
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info
--mandir=/usr/share/man --enable-languages=c,c++,f77,objc,java,ada
--disable-checking --libdir=/usr/lib --enable-libgcj
--with-slibdir=/lib --with-system-zlib --enable-shared
--enable-__cxa_atexit i586-suse-linux
Thread model: posix
gcc version 3.3.5 20050117 (prerelease) (SUSE Linux)

user@...quiri:~> make --version
GNU Make 3.80
Copyright (C) 2002  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

user@...quiri:~> ld -v
GNU ld version 2.15.94.0.2.2 20041220 (SuSE Linux)
user@...quiri:~>

I read in kernel Changes file that versions should be ok..

It is on an old a 32 bit AMD athlon XP processor.

user@...quiri:~/linux-2.6.32.2> cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 8
model name      : AMD Athlon(tm) XP 2200+
stepping        : 1
cpu MHz         : 1795.500
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow ts
bogomips        : 3624.67
clflush size    : 32

I tracked this issue to be related to the said function
(radeon_test_moves) in the code line where the number of test is
calculated (line 45).

I did a workaround by performing a cast to unsigned of the first
division operand, but I have really no idea about what that code is
doing...

Thanks
Andrea
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