[PATCH 3.18-rc3 v8 1/4] irqchip: gic: Make gic_raise_softirq() FIQ-safe

Thomas Gleixner tglx at linutronix.de
Mon Nov 24 12:41:00 PST 2014

On Mon, 24 Nov 2014, Daniel Thompson wrote:
> I did want to remove the lock too. However when I reviewed this code I
> concluded the lock was still required. Without it I think it is possible
> for gic_raise_softirq() to raise an IPI on the old core *after* the code
> to migrate pending IPIs has been run.

And I bet it took you quite some time to figure that out from that
overly documented abuse of irq_controller_lock. See my other reply.



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