linux-kernel - [PATCH 1/5] ARC: SMP: Use "unsigned virq" in smp_ipi_irq

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Date:   Sat, 22 Oct 2016 01:15:27 +0300
From:   Yuriy Kolerov <yuriy.kolerov@...opsys.com>
To:     linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Vineet.Gupta1@...opsys.com,
        Alexey.Brodkin@...opsys.com,
        Yuriy Kolerov <yuriy.kolerov@...opsys.com>
Subject: [PATCH 1/5] ARC: SMP: Use "unsigned virq" in smp_ipi_irq_setup instead of "signed irq"

This function takes a cpu number and a virq number and registers an
appropriate handler per cpu. However smp_ipi_irq_setup is incorrectly
used in several places of ARC platform code - hwirq is passed instead
of virq. This patch is intended to clarify declaration of virq argument
to prevent passing of hwirq instead of virq in future.

Signed-off-by: Yuriy Kolerov <yuriy.kolerov@...opsys.com>
---
 arch/arc/include/asm/smp.h | 4 ++--
 arch/arc/kernel/smp.c      | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/arc/include/asm/smp.h b/arch/arc/include/asm/smp.h
index 89fdd1b..3ebebbc 100644
--- a/arch/arc/include/asm/smp.h
+++ b/arch/arc/include/asm/smp.h
@@ -37,9 +37,9 @@ extern const char *arc_platform_smp_cpuinfo(void);
  * API expected BY platform smp code (FROM arch smp code)
  *
  * smp_ipi_irq_setup:
- *	Takes @cpu and @irq to which the arch-common ISR is hooked up
+ *	Takes @cpu and @virq to which the arch-common ISR is hooked up
  */
-extern int smp_ipi_irq_setup(int cpu, int irq);
+extern int smp_ipi_irq_setup(int cpu, unsigned int virq);
 
 /*
  * struct plat_smp_ops	- SMP callbacks provided by platform to ARC SMP
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index f183cc6..ec4d956 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -351,7 +351,7 @@ irqreturn_t do_IPI(int irq, void *dev_id)
  */
 static DEFINE_PER_CPU(int, ipi_dev);
 
-int smp_ipi_irq_setup(int cpu, int irq)
+int smp_ipi_irq_setup(int cpu, unsigned int virq)
 {
 	int *dev = per_cpu_ptr(&ipi_dev, cpu);
 
@@ -359,12 +359,12 @@ int smp_ipi_irq_setup(int cpu, int irq)
 	if (!cpu) {
 		int rc;
 
-		rc = request_percpu_irq(irq, do_IPI, "IPI Interrupt", dev);
+		rc = request_percpu_irq(virq, do_IPI, "IPI Interrupt", dev);
 		if (rc)
-			panic("Percpu IRQ request failed for %d\n", irq);
+			panic("Percpu IRQ request failed for %d\n", virq);
 	}
 
-	enable_percpu_irq(irq, 0);
+	enable_percpu_irq(virq, 0);
 
 	return 0;
 }
-- 
2.7.4