On Thu, 9 Feb 2017, Thomas Gleixner wrote:

And how does that solve the problem at hand? Not at all:

CPU 0	     	  	    CPU 1

for_each_online_cpu(cpu)
 ==> cpu = 1
			    stop_machine()
			    set_cpu_online(1, false)
 queue_work(cpu1)

Thanks,

Well thats not how I remember stop_machine does work. Doesnt it stop the
processing on all cpus otherwise its not a real usable stop.

The stop_machine would need to ensure that all cpus cease processing
before proceeding.


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