Re: [PATCH] irqchip/irq-brcmstb-l2: Avoid saving mask on shutdown

[Thomas Gleixner]

On Mon, Apr 22 2024 at 15:26, Florian Fainelli wrote:
> On 4/22/24 14:29, Thomas Gleixner wrote:
>>> +	if (save)
>>> +		b->saved_mask = irq_reg_readl(gc, ct->regs.mask);
>> 
>> what's the conditional actually buying you except more complex code?
>
> Not much this is an optimization that is simple to carry out. There can 
> be dozens of such L2 interrupt controllers in a given system and the 
> MMIO accesses start adding up eventually.

I'm impressed by saving ~12 microseconds per one dozen of interrupt
controllers on system shutdown :)