[patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-2

[Ingo Molnar]

* Ingo Molnar <mingo@xxxxxxx> wrote:

> > Yup, !PREEMPT works fine.  Testing PREEMPT next.  So far only
> > PREEMPT_VOLUNTARY fails to boot.
> 
> found a bug that causes !PREEMPT boot failures. The seqlock type was
> wrong for the !RT case, resulting in a subtle bug:
> write_seqlock_irqsave() didnt actually disable interrupts. This
> results in a deadlock scenario in where the timer interrupt interrupts
> update_times (which runs in softirq context). I've uploaded the -31-1
> patch with this fix included to the usual place:
> 
>     http://redhat.com/~mingo/realtime-preempt/
> 
> i'm cycling through the various options, but it's looking good so far,
> PREEMPT_NONE, PREEMPT_VOLUNTARY and PREEMPT_DESKTOP all booted up
> fine.

all variations i tried booted up fine. While fixing the non-RT cases a
bug slipped into the PREEMPT_RT branch of seqlock.h though, i fixed that
in the -31-2 patch i just uploaded.

	Ingo
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