(usagi-users 00796) IPSec breaks in latest snapshot?

[Parijat Mishra <parijat@xxxxxxxxxxxxxx>]

When I compile the latest (20010917) kernel with Ipv6 and IPSec enabled, make 
bzIMage gives me:
=====================================
ld -m elf_i386 -T 
/home/parijat/kernels/USAGI/usagi-20010917/kernel/linux24/arch/i386/vmlinux.lds 
-e stext arch/i386/kernel/head.o arch/i386/kernel/init_task.o init/main.o 
init/version.o \
        --start-group \
        arch/i386/kernel/kernel.o arch/i386/mm/mm.o kernel/kernel.o mm/mm.o 
fs/fs.o ipc/ipc.o \
         drivers/char/char.o drivers/block/block.o drivers/misc/misc.o 
drivers/net/net.o drivers/media/media.o drivers/char/agp/agp.o 
drivers/char/drm/drm.o drivers/ide/idedriver.o drivers/cdrom/driver.o 
drivers/pci/driver.o drivers/pnp/pnp.o drivers/video/video.o \
        net/network.o \
        crypto/crypto.o \
        
/home/parijat/kernels/USAGI/usagi-20010917/kernel/linux24/arch/i386/lib/lib.a 
/home/parijat/kernels/USAGI/usagi-20010917/kernel/linux24/lib/lib.a 
/home/parijat/kernels/USAGI/usagi-20010917/kernel/linux24/arch/i386/lib/lib.a 
\
        --end-group \
        -o vmlinux
net/network.o: In function `sadb_lifetime_scan':
net/network.o(.text+0x5a478): undefined reference to `write_trylock'
net/network.o(.text+0x5a4a7): undefined reference to `write_trylock'
make: *** [vmlinux] Error 1
=========================================

I had disabled SMP support. When I enabled it, the problem went away. So I 
suspect that it has something to do with spinlocks.  Eh?

-- 
Parijat Mishra
R & D Engineer,
Centre for Wireless Communications, NUS
Tel: (65)8709353