Jason Thorpe wrote:
> 
> On Sunday, August 10, 2003, at 02:37  PM, Stephan Uphoff wrote:
> 
> > cpu_switch() running on CPU B tries to acquire the scheduler lock while
> > blocking all interrupts.
> 
> sched_lock must be acquired while at splsched().  So, if you're not 
> blocking all interrupts here, you must go to splsched() somehow.


> >         movl    $IPL_HIGH,CPUVAR(ILEVEL)                # splhigh

Doesn't this imply splsched ?

	Stephan

> 
> 
> >
> > 	Stephan
> >
> >
> > Index: locore.S
> > ===================================================================
> > RCS file: /cvsroot/src/sys/arch/i386/i386/locore.S,v
> > retrieving revision 1.13
> > diff -u -r1.13 locore.S
> > --- locore.S    2003/08/08 20:14:06     1.13
> > +++ locore.S    2003/08/10 21:20:40
> > @@ -1794,7 +1794,8 @@
> >         cli
> >         cmpl    $0,_C_LABEL(sched_whichqs)
> >         jz      idle_loop
> > -idle_exit:
> > +idle_exit:
> > +       sti
> >         movl    $IPL_HIGH,CPUVAR(ILEVEL)                # splhigh
> >  #if defined(MULTIPROCESSOR) || defined(LOCKDEBUG)
> >         call    _C_LABEL(sched_lock_idle)
> >
> >
> >
>          -- Jason R. Thorpe <thorpej@wasabisystems.com>
> 
>