From: Mykola Kvach <mykola_kv...@epam.com>
SGI and PPI descriptors are banked and stored in the per-CPU local_irq_desc
array, so not all elements of the global irq_desc array are used. This is
already accounted for in the descriptor lookup logic inside __irq_to_desc:
return &irq_desc[irq - NR_LOCAL_IRQS];
Therefore, the size of the irq_desc array can be reduced by NR_LOCAL_IRQS,
saving (NR_LOCAL_IRQS * L1_CACHE_BYTES) bytes of memory.
Signed-off-by: Mykola Kvach <mykola_kv...@epam.com>
---
xen/arch/arm/irq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/arch/arm/irq.c b/xen/arch/arm/irq.c
index b9757d7ad3..03fbb90c6c 100644
--- a/xen/arch/arm/irq.c
+++ b/xen/arch/arm/irq.c
@@ -45,7 +45,7 @@ void irq_end_none(struct irq_desc *irq)
gic_hw_ops->gic_host_irq_type->end(irq);
}
-static irq_desc_t irq_desc[NR_IRQS];
+static irq_desc_t irq_desc[NR_IRQS - NR_LOCAL_IRQS];
static DEFINE_PER_CPU(irq_desc_t[NR_LOCAL_IRQS], local_irq_desc);
struct irq_desc *__irq_to_desc(unsigned int irq)
--
2.43.0
