linux-kernel - Re: [PATCH 4/4] irqchip/sifive-plic: Set default irq affinity in plic_irqdomain

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Message-ID: <6e9bf7e1ea3493c63a23c19485f3c644@kernel.org>
Date:   Sat, 16 May 2020 13:30:31 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Anup Patel <anup.patel@....com>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Atish Patra <atish.patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] irqchip/sifive-plic: Set default irq affinity in
 plic_irqdomain_map()

On 2020-05-16 07:39, Anup Patel wrote:
> For multiple PLIC instances, each PLIC can only target a subset of
> CPUs which is represented by "lmask" in the "struct plic_priv".
> 
> Currently, the default irq affinity for each PLIC interrupt is all
> online CPUs which is illegal value for default irq affinity when we
> have multiple PLIC instances. To fix this, we now set "lmask" as the
> default irq affinity in for each interrupt in plic_irqdomain_map().
> 
> Signed-off-by: Anup Patel <anup.patel@....com>
> ---
>  drivers/irqchip/irq-sifive-plic.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/irqchip/irq-sifive-plic.c
> b/drivers/irqchip/irq-sifive-plic.c
> index e42fc082ad18..9af5e2fd2574 100644
> --- a/drivers/irqchip/irq-sifive-plic.c
> +++ b/drivers/irqchip/irq-sifive-plic.c
> @@ -174,6 +174,7 @@ static int plic_irqdomain_map(struct irq_domain
> *d, unsigned int irq,
>  	irq_domain_set_info(d, irq, hwirq, &priv->chip, d->host_data,
>  			    handle_fasteoi_irq, NULL, NULL);
>  	irq_set_noprobe(irq);
> +	irq_set_affinity(irq, &priv->lmask);
>  	return 0;
>  }

Isn't that a fix? If so, please add a Fixes: tag, as well as a CC to
stable if you think it should be backported.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...