Re: [PATCH v3 5/5] watchdog: qcom: Register pretimeout interrupt as NMI

[Konrad Dybcio]

On 9/3/26 3:54 AM, Mayank Rungta wrote:
> When a system is completely unresponsive due to an interrupt storm or
> deadlocked CPU cores with standard interrupts disabled, a standard
> watchdog pretimeout bark interrupt will fail to execute, preventing the
> pretimeout governor from capturing CPU backtraces before the hardware
> reset bite.

[...]

> -			ret = devm_request_irq(dev, irq, qcom_wdt_isr, 0,
> -					       "wdt_bark", &wdt->wdd);
> -			if (ret)
> -				return ret;
> +			wdt->irq = irq;
> +			irq_flags = IRQF_PERCPU | IRQF_NOBALANCING |
> +				    IRQF_NO_AUTOEN | IRQF_NO_THREAD;
> +
> +			ret = request_nmi(irq, qcom_wdt_isr, irq_flags,
> +					  "wdt_bark", &wdt->wdd);
> +			if (ret) {
> +				/* Fallback to normal interrupt if NMI not supported */
> +				ret = devm_request_irq(dev, irq, qcom_wdt_isr, 0,
> +						       "wdt_bark", &wdt->wdd);

GPT noticed this IRQ is requested but never enabled (NO_AUTOEN)

Konrad