Re: [PATCH 1/1] iommu/hyper-v: Use helper instead of directly accessing affinity

[Marc Zyngier <maz@kernel.org>]

On Wed, 03 Aug 2022 17:26:10 +0100,
"Michael Kelley (LINUX)" <mikelley@microsoft.com> wrote:
> 
> From: Randy Dunlap <rdunlap@infradead.org> Sent: Monday, July 25, 2022 7:39 PM
> > 
> > On 7/25/22 17:53, Michael Kelley wrote:
> > > Recent changes to solve inconsistencies in handling IRQ masks #ifdef
> > > out the affinity field in irq_common_data for non-SMP configurations.
> > > The current code in hyperv_irq_remapping_alloc() gets a compiler error
> > > in that case.
> > >
> > > Fix this by using the new irq_data_update_affinity() helper, which
> > > handles the non-SMP case correctly.
> > >
> > 
> > Reported-by: Randy Dunlap <rdunlap@infradead.org>
> > > Signed-off-by: Michael Kelley <mikelley@microsoft.com>
> > Tested-by: Randy Dunlap <rdunlap@infradead.org>
> > Acked-by: Randy Dunlap <rdunlap@infradead.org>
> > 
> > Thanks.
> > 
> > > ---
> > >  drivers/iommu/hyperv-iommu.c | 4 +---
> > >  1 file changed, 1 insertion(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv-iommu.c
> > > index 51bd66a..e190bb8 100644
> > > --- a/drivers/iommu/hyperv-iommu.c
> > > +++ b/drivers/iommu/hyperv-iommu.c
> > > @@ -68,7 +68,6 @@ static int hyperv_irq_remapping_alloc(struct irq_domain
> > *domain,
> > >  {
> > >  	struct irq_alloc_info *info = arg;
> > >  	struct irq_data *irq_data;
> > > -	struct irq_desc *desc;
> > >  	int ret = 0;
> > >
> > >  	if (!info || info->type != X86_IRQ_ALLOC_TYPE_IOAPIC || nr_irqs > 1)
> > > @@ -90,8 +89,7 @@ static int hyperv_irq_remapping_alloc(struct irq_domain *domain,
> > >  	 * Hypver-V IO APIC irq affinity should be in the scope of
> > >  	 * ioapic_max_cpumask because no irq remapping support.
> > >  	 */
> > > -	desc = irq_data_to_desc(irq_data);
> > > -	cpumask_copy(desc->irq_common_data.affinity, &ioapic_max_cpumask);
> > > +	irq_data_update_affinity(irq_data, &ioapic_max_cpumask);
> > >
> > >  	return 0;
> > >  }
> > 
> > --
> 
> Marc --
> 
> Could you pick up this patch for the 6.0 merge window?  It's a fix to a
> side effect of Samuel Holland's series to unify SMP and UP handling of
> affinity masks that went through your irq/irqchip-next tree.

Applied with a:

Fixes: aa0813581b8d ("genirq: Provide an IRQ affinity mask in non-SMP configs")

Thanks,

	M.

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