[PATCH] ARM: formalize an IPI for CPU wake-ups

[Nicolas Pitre]

On Mon, 11 Jun 2012, Russell King - ARM Linux wrote:

> On Mon, Jun 11, 2012 at 01:18:28PM -0400, Nicolas Pitre wrote:
> > And that message certainly has to go as it may be triggered multiple 
> > times per second in some use cases here.
> 
> That, I interpret, as an attempt to use CPU hotplugging for power
> saving.
> 
> No.  Do not do that.  Under any circumstances.  Not only is the CPU
> hotplugging code racy in places, it also totally destroys the ability
> to have threads bound to CPUs, or even interrupts to CPUs.

[ more comments ommitted ]

Russell, let me suggest you take the time to read this:

	http://lwn.net/Articles/481055/

then let's restart this conversation if you please.


Nicolas