Re: RFC [PATCH] x86: introduce nr_irqs for 64bit

[Ingo Molnar]

* Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:

> add DEFINE_DYN_ARRAY for dynamical array support
> 
> todo:
> 1. convert x86 32bit and other arch
> 2. nr_irqs auto probe via acpi_oem_check?
> 
> Signed-off-by: Yinghai Lu <yhlu.kernel@xxxxxxxxx>

wonderful!

I have one main structural suggestion: could we please keep the NR_IRQS 
name, and just change it to dynamic on x86? NR_IRQS is used in 540 
places in the kernel, there's no point in touching all that code.

Also add an CONFIG_ARCH_HAS_DYNAMIC_NR_IRQS switch, define it in 
arch/x86/Kconfig and use it in include/linux/irq.h.

This will create far less migration pain than the widespread rename. 
That will also solve the "what about the other architectures" question.

	Ingo
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