diff options
| author | Samuel Holland <samuel@sholland.org> | 2022-07-01 15:00:56 -0500 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-07-07 09:38:04 +0100 |
| commit | aa0813581b8d37bdd91cd40b67ef79ffa45104b2 (patch) | |
| tree | 46ac9b881b3a2ed8a57661b83bb5a408447d83b2 /include/linux/irq.h | |
| parent | 4d0b8298818b623f5fa51d5c49e1a142d3618ac9 (diff) | |
| download | lwn-aa0813581b8d37bdd91cd40b67ef79ffa45104b2.tar.gz lwn-aa0813581b8d37bdd91cd40b67ef79ffa45104b2.zip | |
genirq: Provide an IRQ affinity mask in non-SMP configs
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 provide a correct affinity mask without allocating one per IRQ.
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>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220701200056.46555-9-samuel@sholland.org
Diffstat (limited to 'include/linux/irq.h')
| -rw-r--r-- | include/linux/irq.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 02073f7a156e..996e22744edd 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 @@ -882,13 +884,19 @@ static inline int irq_data_get_node(struct irq_data *d) static inline const struct cpumask *irq_data_get_affinity_mask(struct irq_data *d) { +#ifdef CONFIG_SMP return d->common->affinity; +#else + return cpumask_of(0); +#endif } static inline void irq_data_update_affinity(struct irq_data *d, const struct cpumask *m) { +#ifdef CONFIG_SMP cpumask_copy(d->common->affinity, m); +#endif } static inline const struct cpumask *irq_get_affinity_mask(int irq) |