linux-kernel - Re: [PATCH 1/1] genirq/cpuhotplug: Bump debugging information print down to KERN

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Date:   Tue, 10 Aug 2021 16:21:01 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Lee Jones <lee.jones@...aro.org>, lee.jones@...aro.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ming Lei <ming.lei@...hat.com>, Hannes Reinecke <hare@...e.com>
Subject: Re: [PATCH 1/1] genirq/cpuhotplug: Bump debugging information print
 down to KERN_DEBUG

On Thu, Jun 17 2021 at 08:31, Lee Jones wrote:
> This sort of information is only generally useful when debugging.
>
> No need to have these sprinkled through the kernel log otherwise.

Yes and no. 

> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  kernel/irq/cpuhotplug.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c
> index 02236b13b3599..cf8d4f75632e8 100644
> --- a/kernel/irq/cpuhotplug.c
> +++ b/kernel/irq/cpuhotplug.c
> @@ -42,7 +42,7 @@ static inline bool irq_needs_fixup(struct irq_data *d)
>  		 * If this happens then there was a missed IRQ fixup at some
>  		 * point. Warn about it and enforce fixup.
>  		 */
> -		pr_warn("Eff. affinity %*pbl of IRQ %u contains only offline CPUs after offlining CPU %u\n",

This one is clearly a warning as this should not happen. See the
comments around that.

> +		pr_debug("Eff. affinity %*pbl of IRQ %u contains only offline CPUs after offlining CPU %u\n",
>  			cpumask_pr_args(m), d->irq, cpu);
>  		return true;
>  	}
> @@ -166,7 +166,7 @@ void irq_migrate_all_off_this_cpu(void)
>  		raw_spin_unlock(&desc->lock);
>  
>  		if (affinity_broken) {
> -			pr_warn_ratelimited("IRQ %u: no longer affine to CPU%u\n",
> +			pr_debug_ratelimited("IRQ %u: no longer affine to CPU%u\n",
>  					    irq, smp_processor_id());

Maybe, but distro people might have opinions on that.

Thanks,

        tglx