linux-kernel - Re: [RFC][PATCH 09/14] genirq: add irq_kmemdump

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Message-ID: <1331aa82-fee9-4788-abd9-ef741d00909e@linaro.org>
Date: Wed, 7 May 2025 13:27:55 +0300
From: Eugen Hristev <eugen.hristev@...aro.org>
To: Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, andersson@...nel.org
Cc: linux-doc@...r.kernel.org, corbet@....net, mingo@...hat.com,
 rostedt@...dmis.org, john.ogness@...utronix.de, senozhatsky@...omium.org,
 pmladek@...e.com, peterz@...radead.org, mojha@....qualcomm.com,
 linux-arm-kernel@...ts.infradead.org, vincent.guittot@...aro.org,
 konradybcio@...nel.org, dietmar.eggemann@....com, juri.lelli@...hat.com
Subject: Re: [RFC][PATCH 09/14] genirq: add irq_kmemdump_register



On 5/7/25 13:18, Thomas Gleixner wrote:
> 
> $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?

Thank you very much for your review ! I will try it out.

Eugen
> 
> Thanks,
> 
>         tglx