With this hack, I'm getting an SMP boot all the way to the
init script 'Checking for new Hardware  [OK]' before the
hang.  

This patch is against linux+ia64+ingoJ0.

Nick

On Wed, Jan 16, 2002 at 05:42:30PM -0800, David Mosberger wrote:
> In case you're still fighting with Ingo's scheduler on 2.4.xx, you
> might want to try the attached patch.  It's a gross hack to work
> around a race condition in set_cpus_allowed().  Without this hack, the
> kernel would almost always die as soon as it tried to migrate
> ksoftirqd_CPU1 from CPU 0 to CPU 1.  With the patch, it boots up to
> the point where the serial line driver gets initialized, which is
> progress, I suppose.
> 
> The fundamental problem is that current set_cpus_allowed() lets the
> same task run on two CPUs for a brief period of time.  This violates
> scheduling assumptions made by the kernel and hence results in race
> conditions.
> 
> 	--david