2.5.4 Compile Error

[John Weber <weber@nyc.rr.com>]

Will try to specify the problem more precisely after I play around for a 
bit, but here goes the error:

[root@boolean linux-2.5.4]# make bzImage
gcc -D__KERNEL__ -I/usr/src/linux-2.5.4/include -Wall 
-Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer 
-fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 
-march=i686   -DKBUILD_BASENAME=main -c -o init/main.o init/main.c
In file included from /usr/src/linux-2.5.4/include/asm/thread_info.h:13,
                  from /usr/src/linux-2.5.4/include/linux/thread_info.h:10,
                  from /usr/src/linux-2.5.4/include/linux/spinlock.h:7,
                  from /usr/src/linux-2.5.4/include/linux/mmzone.h:8,
                  from /usr/src/linux-2.5.4/include/linux/gfp.h:4,
                  from /usr/src/linux-2.5.4/include/linux/slab.h:14,
                  from /usr/src/linux-2.5.4/include/linux/proc_fs.h:5,
                  from init/main.c:15:
/usr/src/linux-2.5.4/include/asm/processor.h: In function `thread_saved_pc':
/usr/src/linux-2.5.4/include/asm/processor.h:444: dereferencing pointer 
to incomplete type
make: *** [init/main.o] Error 1