Updated preempt-kernel patches

From: Robert Love (rml@tech9.net)
Date: Fri Oct 12 2001 - 15:19:36 EST

Updated preempt-kernel patches for 2.4.10, 2.4.12, 2.4.13-pre1, and
(phew!) 2.4.12-ac1 are available at:


Note the patches for 2.4.10 are updated over previously releases.

These patches allow create a preemptible kernel -- increasing system
response time. Everyone is encouraged to give it a whirl and report

Major changes include code to prevent CPU changes on preempt (should
prevent a class of race conditions), an SMP compile fix, and various

Full change log:

- remove pgalloc.h preemption disable statements -- not
  needed with the new CPU switch prevention
- fix compile on SMP in some configurations (ac tree only)

- rearrange sched.c so we can patch cleanly against rtsched
  (or vice versa)

- prevent the case of preemption causing a CPU switch
  by locking tasks to the current CPU in preempt_schedule
- revert to _raw_spin_xxx from _spin_xxx since PPC uses
  that convention.

- push pcmcia-cs tools fix into their next release

- fix spin_lock_prefetch optimization causing (harmless)
  compile warnings

        Robert Love

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This archive was generated by hypermail 2b29 : Mon Oct 15 2001 - 21:00:46 EST