[RFC][PATCH 09/14] genirq: add irq_kmemdump_register

[Thomas Gleixner]

$Subject: ... See

https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#patch-submission-notes

On Tue, Apr 22 2025 at 14:31, Eugen Hristev wrote:
> Add function to register irq info into kmemdump.

What is irq info? Please explain explicitly which information is exposed
and why.

>  
> +void irq_kmemdump_register(void)
> +{
> +	kmemdump_register("irq", (void *)&nr_irqs, sizeof(nr_irqs));
> +}
> +EXPORT_SYMBOL_GPL(irq_kmemdump_register);

Are you going to slap a gazillion of those register a single variable
functions all over the place?

That's a really horrible idea.

The obvious way to deal with that is to annotate the variable:

static unsigned int nr_irqs = NR_IRQS;
KMEMDUMP_VAR(nr_irqs);

Let KMEMDUMP_VAR() store the size and the address of 'nr_irqs' in a
kmemdump specific section and then kmemdump can just walk that section
and dump stuff. No magic register functions and no extra storage
management for static/global variables.

No?

Thanks,

        tglx