It's obviously a little late for this round, but I'd like to propose a few of Leland Lucius's patches for official acceptance into the stock Debian kernel. The "2.4.19" ones apply cleanly to 2.4.21, except for the vmparms patch, which requires -F3 to apply. In decreasing order of importance (in my opinion anyway):
http://www.homerow.net/zlinux/vmparms.htm (diff is: http://www.homerow.net/files/linux-2.4.19.vmparms.diff but you must use -F3 to apply it) is *incredibly* handy, because it lets you do IPL <linux-device-or-NSS> PARM LINE <whatever> and <whatever> is appended to the parm line built into the IPL record. This lets you trivially do stuff like boot Linux with different memory sizes, different DASD ranges, and so on. http://www.homerow.net/files/linux-2.4.19.toupper.diff This one upcases the VMPOFF and VMHALT parameters; helpful in conjunction with VMPARMS among other things. http://www.homerow.net/files/linux-2.4.21-fix-disk-stat.diff Linux/390s DASD is at a higher major device number than x86; this one bumps up the major number of devices considered as potential disks when collecting statistics, so you can get I/O statistics for S/390 DASD. Nice, but not crucial. http://www.homerow.net/files/linux-2.4.19-fix-install.diff Fixes the Makefile for to install kerntypes if you built it, which might be useful to some people. Adam

