[patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-10

[Ingo Molnar]

i have released the -V0.7.30-10 Real-Time Preemption patch, which can be
downloaded from the usual place:

    http://redhat.com/~mingo/realtime-preempt/

this is a fixes-only release.

the most important fixes are the ones to the priority inheritance logic
(affecting the latency of RT tasks), discovered and reported by Esben
Nielsen. I also found two more PI bugs running the new pi_test2 code
from Esben.

Changes since -V0.7.30-9:

 - PI fixes:

   - the waiter->prio field caused wrong priority settings upon unlock, 
     resulting in PI bugs in the nested-locking case.

   - use rt_task() when determining PI tasks, not p->policy.

   - in the blocking-on-blocked-task nesting case both promote now-RT
     tasks to the pi_waiters list and queue them to the head of the wait
     list, and demote now-non-RT tasks from the pi_waiters list and 
     queue them to the tail of the wait list.

 - PI-debugging blocker device update from Esben Nielsen

 - module build fix: export user_trace_stop symbol, this fixes the error 
   reported by Florian Schmidt

 - tracer fix: in the default !freerunning tracing mode, if the trace
   buffer overflows (this is relatively rare, but can happen) then the
   tracer overwrote kernel memory that leads to lockups/kernel crashes. 
   Maybe this bug was also the source of the truncated trace bug
   reported by Mark H. Johnson?

 - reduce tracing overhead within schedule() when !tracing_enabled.

to create a -V0.7.30-10 tree from scratch, the patching order is:

  http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.9.tar.bz2
  http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.10-rc2.bz2
  http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.10-rc2/2.6.10-rc2-mm2/2.6.10-rc2-mm2.bz2
  http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.10-rc2-mm2-V0.7.30-10

	Ingo
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