linux-kernel - Re: [PATCH 4/4] genirq: Initialize resend_node hlist for all irq

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Date: Thu, 18 Jan 2024 14:09:52 +0000
From: Marc Zyngier <maz@...nel.org>
To: Dawei Li <dawei.li@...ngroup.cn>
Cc: tglx@...utronix.de,
	sdonthineni@...dia.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	set_pte_at@...look.com,
	stable@...r.kernel.org
Subject: Re: [PATCH 4/4] genirq: Initialize resend_node hlist for all irq_desc

On Thu, 18 Jan 2024 11:27:39 +0000,
Dawei Li <dawei.li@...ngroup.cn> wrote:
> 
> For !CONFIG_SPARSE_IRQ kernel, early_irq_init() is supposed to
> initialize all the desc entries in system, desc->resend_node
> included.
> 
> Thus, initialize desc->resend_node for all irq_desc entries, rather
> than irq_desc[0] only, which is the current implementation is about.
> 
> Fixes: bc06a9e08742 ("genirq: Use hlist for managing resend handlers")
> Cc: stable@...r.kernel.org
> 
> Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
> ---
>  kernel/irq/irqdesc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
> index 27ca1c866f29..371eb1711d34 100644
> --- a/kernel/irq/irqdesc.c
> +++ b/kernel/irq/irqdesc.c
> @@ -600,7 +600,7 @@ int __init early_irq_init(void)
>  		mutex_init(&desc[i].request_mutex);
>  		init_waitqueue_head(&desc[i].wait_for_threads);
>  		desc_set_defaults(i, &desc[i], node, NULL, NULL);
> -		irq_resend_init(desc);
> +		irq_resend_init(&desc[i]);
>  	}
>  	return arch_early_irq_init();
>  }

Well spotted. It would probably be worth having a helper that fully
initialises one desc, but that's out of the scope of this fix.

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.