linux内核2.6.20编译出现的错误

用的编译器是arm-linux-gcc-3.4.1，在经过漫长的等待之后，得到的错误如下
drivers/built-in.o(.text+0x2d590): In function `drm_lock_take':
: undefined reference to `cmpxchg'
drivers/built-in.o(.text+0x2d954): In function `drm_lock_free':
: undefined reference to `cmpxchg'
drivers/built-in.o(.text+0x2dacc): In function `drm_unlock':
: undefined reference to `cmpxchg'
drivers/built-in.o(.text+0x2db68): In function `$a':
: undefined reference to `cmpxchg'
make: *** [.tmp_vmlinux1] Error 1
请问各位大虾有何良策？