building 2.4.31 for a non-smp system

[Per Jessen <per@computer.org>]

I'm upgrading a box from 2.4.23 to .31, but I'm seeing lots of errors
along these lines:

gcc -D__KERNEL__ -I/usr/src/linux-2.4.31/include -Wall
-Wstrict-prototypes -Wno-trigraphs -O2 -fno-strict-aliasing -fno-common
-fomit-frame-pointer -pipe -mpreferred-stack-boundary=2 -march=i686   
-nostdinc -iwithprefix include -DKBUILD_BASENAME=tty_ioctl
-DEXPORT_SYMTAB -c tty_ioctl.c
In file included from /usr/src/linux-2.4.31/include/linux
modversions.h:177,
                from /usr/src/linux-2.4.31/include/linux/module.h:22,
                from tty_ioctl.c:21:
/usr/src/linux-2.4.31/include/linux/modules/ksyms.ver:576:1: warning:
"del_timer_sync" redefined
In file included from /usr/src/linux-2.4.31/include/linux
ext3_fs_sb.h:20,
                from /usr/src/linux-2.4.31/include/linux/fs.h:715,
                from /usr/src/linux-2.4.31/include/linux
capability.h:17,
                from /usr/src/linux-2.4.31/include/linux/binfmts.h:5,
                from /usr/src/linux-2.4.31/include/linux/sched.h:9,
                from tty_ioctl.c:14:
/usr/src/linux-2.4.31/include/linux/timer.h:30:1: warning: this is the
location of the previous definition
In file included from /usr/src/linux-2.4.31/include/linux
modversions.h:177,
                from /usr/src/linux-2.4.31/include/linux/module.h:22,
                from tty_ioctl.c:21:
/usr/src/linux-2.4.31/include/linux/modules/ksyms.ver:660:1: warning:
"set_cpus_allowed" redefined
In file included from tty_ioctl.c:14:
/usr/src/linux-2.4.31/include/linux/sched.h:159:1: warning: this is the
location of the previous definition


The redefinition of "set_cpus_allowed" and "del_timer_sync" only happen
when CONFIG_SMP isn't set.  
I guess I could simply compile with CONFIG_SMP, but surely something's
not right here?

Follow-up:
OK, I've built the kernel with SMP support, and I'm not seeing the above 
any longer. However, when I tried to load module nfsd, I get:

/lib/modules/2.4.31/kernel/net/sunrpc/sunrpc.o: unresolved symbol 
kernel_flag_cacheline
/lib/modules/2.4.31/kernel/net/sunrpc/sunrpc.o: unresolved symbol 
atomic_dec_and_lock
/lib/modules/2.4.31/kernel/net/sunrpc/sunrpc.o: insmod 
/lib/modules/2.4.31/kernel/net/sunrpc/sunrpc.o failed
/lib/modules/2.4.31/kernel/net/sunrpc/sunrpc.o: insmod nfsd failed



Per Jessen, Zurich
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