Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race with preemptiblekernel and CPU hotplug

[Roland McGrath]

> That said, I wonder how useful it is to do the SMP->UP code transition.  
> How often does a kernel go from being SMP to UP in a situation where we 
> really care about the performance?  And that won't be shortly be 
> becoming SMP again anyway?

I agree, it only seems worthwhile to do this substitution when from the
config+hardware it's determined at boot that nr_cpus_possible==1 (i.e. no
CPU hotplug possibility).


Thanks,
Roland
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