RE: [PATCH 4/4] irqchip/sifive-plic: Set default irq affinity in plic_irqdomain_map()

[Anup Patel]

> -----Original Message-----
> From: Marc Zyngier <maz@xxxxxxxxxx>
> Sent: 16 May 2020 18:01
> To: Anup Patel <Anup.Patel@xxxxxxx>
> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>; Paul Walmsley
> <paul.walmsley@xxxxxxxxxx>; Thomas Gleixner <tglx@xxxxxxxxxxxxx>; Jason
> Cooper <jason@xxxxxxxxxxxxxx>; Atish Patra <Atish.Patra@xxxxxxx>; Alistair
> Francis <Alistair.Francis@xxxxxxx>; Anup Patel <anup@xxxxxxxxxxxxxx>; linux-
> riscv@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> 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@xxxxxxx>
> > ---
> >  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.

This is certainly a fix. I will add Fixes: tag like you suggested.

Regards,
Anup