On Fri, May 23, 2014 at 08:15:35PM +0530, Srivatsa S. Bhat wrote: > >> + * During CPU offline, we don't want the other CPUs to send > >> + * IPIs to the active_cpu (the outgoing CPU) *after* it has > >> + * disabled interrupts (because, then it will notice the IPIs > >> + * only after it has gone offline). We can prevent this by > >> + * making the other CPUs disable their interrupts first - that > >> + * way, they will run the stop-machine code with interrupts > >> + * disabled, and hence won't send IPIs after that point.
That's complete nonsense, you can send IPIs all you want with interrupts disabled.
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