Re: [PATCH 1/3] irq_work: Implement remote queueing

[Peter Zijlstra]

On Wed, May 14, 2014 at 11:06:29AM +0200, Peter Zijlstra wrote:
> > +	llist_add(&work->llnode, &per_cpu(irq_work_list, cpu));
> > +	native_send_call_func_single_ipi(cpu);
> 
> At the very leastestest make that:
> 
> 	if (llist_add(&work->llnode, &per_cpu(irq_work_list, cpu)))
> 		native_send_call_func_single_ipi(cpu);
> 
> But ideally, also test the IRQ_WORK_LAZY support, its weird to have that
> only be supported for the other queue.
> 
> Hmm, why do we need that LAZY crap, that completely wrecks a perfectly
> simple thing.
> 
> The changelog (bc6679aef673f), not the printk() usage make much sense,

s/not/nor/

> printk() can't cause an IPI storm... printk() isn't fast enough to storm
> anything.

Except, as we all know, slow serial lines.

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