Back in the days of Slackware 12.2 I used the generic nosmp kernel with my old laptop. I used the patch from
/extra/linux-188.8.131.52-nosmp-sdk/ to switch the kernel source from SMP to non-SMP. All went well until the kernel was upgraded with the rest to 184.108.40.206 and the patch stopped working. Therefore I googled around and solved the problem by using the .config file of the running generic nosmp kernel.
Since my old laptop is still in use, I will post this here just in case as a future reference:
cd /usr/src/linux-220.127.116.11 make clean make mrproper cd /lib/modules/18.104.22.168 ln -s /usr/src/linux-22.214.171.124 build cd /usr/src/linux-126.96.36.199 make mrproper cp /boot/config-generic-188.8.131.52 .config make oldconfig make prepare make scripts