Thank you very much, Jun.

One more thing -- we've made quite some changes in
2.2.1 so I wonder what would be the best way to
upgrade. I'm thinking:

1> check out new kernel, use "merge directories"
function from emacs, or

2> use "cvs import" to import the new kernel to
our local cvs repository, then merge with our
local changes by "cvs update/co -j"..

Any comments/suggestions?

Thanks!
-Hua

quoted

We made changes to linux/MIPS kernel 2.2.1 for our
system and it's been running well so far. We now
plan to upgrade the kernel to 2.4.X. The question
is:

Which sub release of 2.4 is more stable and is
recommended to use?

I suggest you use the latest CVS head.  So far it is usually the head that has
the most bug fixes, and really not much dramatic stuff introduced.

Jun