linux-kernel - [PATCH kernel v4 1/8] genirq/ipi: Simplify irq_reserve

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Date:   Tue, 24 Nov 2020 17:17:13 +1100
From:   Alexey Kardashevskiy <aik@...abs.ru>
To:     linux-kernel@...r.kernel.org
Cc:     Cédric Le Goater <clg@...d.org>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Michal Suchánek <msuchanek@...e.de>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        x86@...nel.org, linuxppc-dev@...ts.ozlabs.org,
        Alexey Kardashevskiy <aik@...abs.ru>
Subject: [PATCH kernel v4 1/8] genirq/ipi:  Simplify irq_reserve_ipi

__irq_domain_alloc_irqs() can already handle virq==-1 and free
descriptors if it failed allocating hardware interrupts so let's skip
this extra step.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
---
 kernel/irq/ipi.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/kernel/irq/ipi.c b/kernel/irq/ipi.c
index 43e3d1be622c..1b2807318ea9 100644
--- a/kernel/irq/ipi.c
+++ b/kernel/irq/ipi.c
@@ -75,18 +75,12 @@ int irq_reserve_ipi(struct irq_domain *domain,
 		}
 	}
 
-	virq = irq_domain_alloc_descs(-1, nr_irqs, 0, NUMA_NO_NODE, NULL);
-	if (virq <= 0) {
-		pr_warn("Can't reserve IPI, failed to alloc descs\n");
-		return -ENOMEM;
-	}
-
-	virq = __irq_domain_alloc_irqs(domain, virq, nr_irqs, NUMA_NO_NODE,
-				       (void *) dest, true, NULL);
+	virq = __irq_domain_alloc_irqs(domain, -1, nr_irqs, NUMA_NO_NODE,
+				       (void *) dest, false, NULL);
 
 	if (virq <= 0) {
 		pr_warn("Can't reserve IPI, failed to alloc hw irqs\n");
-		goto free_descs;
+		return -EBUSY;
 	}
 
 	for (i = 0; i < nr_irqs; i++) {
@@ -96,10 +90,6 @@ int irq_reserve_ipi(struct irq_domain *domain,
 		irq_set_status_flags(virq + i, IRQ_NO_BALANCING);
 	}
 	return virq;
-
-free_descs:
-	irq_free_descs(virq, nr_irqs);
-	return -EBUSY;
 }
 
 /**
-- 
2.17.1