Re: [RFT/PATCH 05/10] cbus: retu: move to threaded IRQ and GENIRQ

Tony Lindgren
2011-01-07T17:05:05Z

* Felipe Balbi <balbi@ti.com> [110106 23:47]:
>
> The main point of using Sparse IRQ numbering is exactly avoiding
> pre-processor branches. Instead of defining ranges only when a device is
> compile, we can always keep the range allocated no matter if the device
> probes or not. So, I suggest dropping the ifdeffery on <plat/irqs.h> and
> move that to something like below:

This is fine as long as we we don't run out of allocated IRQs before
switching over to sparse IRQ. The original reason for the ifdeffery
was to keep NR_IRQS below 256 when possible as it optimizes the interrupt
handling in that case. See NR_IRQS in arch/arm/include/asm/hardirq.h
for more info.

Regards,

Tony