I tried the cleaned up patch provided by Steve Langasek. I applied the patches to 2.6.18.2 kernel sources. The patches applied without any issues. However the kernel failed to compile with the following errors:

In file included from include/asm/io.h:250,
from include/linux/dmapool.h:14,
from include/linux/pci.h:564,
from arch/alpha/kernel/alpha_ksyms.c:16:
include/asm/core_titan.h: In function 'titan_ioportmap':
include/asm/core_titan.h:386: error: dereferencing pointer to incomplete type
make[1]: *** [arch/alpha/kernel/alpha_ksyms.o] Error 1
make: *** [arch/alpha/kernel] Error 2

Hopefully this will be resolved soon. It will be very nice to have this patch applied to the upstream kernel sources and included in Debian at some point. I am very much looking forward to it.