Messages in this thread Patch in this message | | | From | Samuel Holland <> | Subject | [PATCH v2 4/6] genirq: Provide an IRQ affinity mask in non-SMP configs | Date | Thu, 16 Jun 2022 01:40:26 -0500 |
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IRQ affinity masks are not allocated in uniprocessor configurations. This requires special case non-SMP code in drivers for irqchips which have per-CPU enable or mask registers.
Since IRQ affinity is always the same in a uniprocessor configuration, we can still provide the correct affinity mask without allocating one per IRQ. We can reuse the system-wide cpu_possible_mask.
By returning a real cpumask from irq_data_get_affinity_mask even when SMP is disabled, irqchip drivers which iterate over that mask will automatically do the right thing.
Signed-off-by: Samuel Holland <samuel@sholland.org> ---
(no changes since v1)
include/linux/irq.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/include/linux/irq.h b/include/linux/irq.h index 69ee4e2f36ce..d5e958b026aa 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -151,7 +151,9 @@ struct irq_common_data { #endif void *handler_data; struct msi_desc *msi_desc; +#ifdef CONFIG_SMP cpumask_var_t affinity; +#endif #ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK cpumask_var_t effective_affinity; #endif @@ -881,7 +883,11 @@ static inline int irq_data_get_node(struct irq_data *d) static inline struct cpumask *irq_data_get_affinity_mask(struct irq_data *d) { +#ifdef CONFIG_SMP return d->common->affinity; +#else + return &__cpu_possible_mask; +#endif } static inline struct cpumask *irq_get_affinity_mask(int irq) -- 2.35.1
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