2.4: updated preemptive kernel patch

This is the preemptive kernel patch, supported by MontaVista. Updated patches for 2.4.18, 2.4.19-pre5, and 2.4.19-pre4-ac3 are now available at:

ftp://ftp.kernel.org/pub/linux/kernel/people/rml/preempt-kernel

as well as older patches for older kernel revisions.

The only major change aside from the sync up is some simple debug code that will catch most any preempt_count oddity without much overhead, courtesy of Andrew Morton. Basically just check the preempt_count for a non-zero value on do_exit.

Nothing pending in the 2.4 codebase. I have a bunch of changes queued for preempt-stats which I will get out real soon now. For 2.5, there are a couple of indirect preempt-related optimizations and lock-fixings in store soon.

Recent Change Log:

20020328

- simple but complete debug check in do_exit (Andrew Morton)

20020301:

- fix the preempt_count for non-CPU0 idle (George Anzinger)
threads

Enjoy,

Robert Love