Problem: while 'make bzImage' can't compile mm/memory.c

For installing HTB (adv routing/queing), i needed to patch the kernel source. My current kernel is 2.4.2-2 form RedHat 7.1. I downloaded the complete kernel 2.4.17 and patched it with htb2_2.4.17.diff. (http://luxik.cdi.cz/~devik/qos/htb/ )
After a 'make config' and 'make dep' the 'make bzImage' fails while compiling mm/memory.c at line 292 && 361 (and some others but that's due to these). In these functionheaders (zap_pte_range and zap_pmd_range) the first parameter is apparently of an unknown type namely mmu_gather_t.

My best guess is that my config is too tight... the host is a Compaq Pentium100 with (correctly configured) onboard LAN and two (also correctly configured) LAN boards. No special chipsets so I answered no to most bugfixes and refrained form x-support, sound and mouse support.

Instead of endlessly trying different configs I got here to ask you guys. If you need more info... ask.