linux-kernel - [PATCH v2 05/12] powerpc/irq: Use unsigned long for IRQ counter sum

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Message-Id: <20210915175848.162260-6-me@ilammy.net>
Date:   Thu, 16 Sep 2021 02:58:41 +0900
From:   Alexei Lozovsky <me@...mmy.net>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH v2 05/12] powerpc/irq: Use unsigned long for IRQ counter sum

Now that all individual counters consistently use unsigned long, use the
same type for their sum. This ensures correct handling of wrap-around
(which is more important for 32-bit PowerPC at this point).

Signed-off-by: Alexei Lozovsky <me@...mmy.net>
---
 arch/powerpc/include/asm/hardirq.h | 2 +-
 arch/powerpc/kernel/irq.c          | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/hardirq.h b/arch/powerpc/include/asm/hardirq.h
index efc5391f84fb..4d3a7d66c299 100644
--- a/arch/powerpc/include/asm/hardirq.h
+++ b/arch/powerpc/include/asm/hardirq.h
@@ -32,7 +32,7 @@ static inline void ack_bad_irq(unsigned int irq)
 	printk(KERN_CRIT "unexpected IRQ trap at vector %02x\n", irq);
 }
 
-extern u64 arch_irq_stat_cpu(unsigned int cpu);
+extern unsigned long arch_irq_stat_cpu(unsigned int cpu);
 #define arch_irq_stat_cpu	arch_irq_stat_cpu
 
 #endif /* _ASM_POWERPC_HARDIRQ_H */
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 9f39de114a0e..1a0a161ee38b 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -645,9 +645,9 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 /*
  * /proc/stat helpers
  */
-u64 arch_irq_stat_cpu(unsigned int cpu)
+unsigned long arch_irq_stat_cpu(unsigned int cpu)
 {
-	u64 sum = READ_ONCE(per_cpu(irq_stat, cpu).timer_irqs_event);
+	unsigned long sum = READ_ONCE(per_cpu(irq_stat, cpu).timer_irqs_event);
 
 	sum += READ_ONCE(per_cpu(irq_stat, cpu).broadcast_irqs_event);
 	sum += READ_ONCE(per_cpu(irq_stat, cpu).pmu_irqs);
-- 
2.25.1