linux-kernel - [PATCH 4/7] x86/irq: arch_irq

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Date:   Sat, 11 Sep 2021 12:48:05 +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 4/7] x86/irq: arch_irq_stat() returns unsigned int

irq_err_count is atomic_t, extending it to u64 does not make the value
wider, it's still unsigned int and will wrap around like unsigned int.

Signed-off-by: Alexei Lozovsky <me@...mmy.net>
---
 arch/x86/include/asm/hardirq.h | 2 +-
 arch/x86/kernel/irq.c          | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 461536b45391..3b0d79e72871 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -57,7 +57,7 @@ extern void ack_bad_irq(unsigned int irq);
 extern unsigned int arch_irq_stat_cpu(unsigned int cpu);
 #define arch_irq_stat_cpu	arch_irq_stat_cpu
 
-extern u64 arch_irq_stat(void);
+extern unsigned int arch_irq_stat(void);
 #define arch_irq_stat		arch_irq_stat
 
 
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index cefe1bc9f42c..18691ed499d1 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -218,9 +218,9 @@ unsigned int arch_irq_stat_cpu(unsigned int cpu)
 	return sum;
 }
 
-u64 arch_irq_stat(void)
+unsigned int arch_irq_stat(void)
 {
-	u64 sum = atomic_read(&irq_err_count);
+	unsigned int sum = atomic_read(&irq_err_count);
 	return sum;
 }
 
-- 
2.25.1