linux-kernel - [PATCH V2] x86: eliminate irq_mis_count counted in arch_irq

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Date:	Fri, 26 Apr 2013 20:50:11 +0800
From:	Li Fei <fei.li@...el.com>
To:	mingo@...hat.com
Cc:	tglx@...utronix.de, hpa@...or.com, x86@...nel.org,
	chuansheng.liu@...el.com, tomoki.sekiyama.qu@...achi.com,
	joe@...ches.com, linux-kernel@...r.kernel.org, fei.li@...el.com
Subject: [PATCH V2] x86: eliminate irq_mis_count counted in arch_irq_stat


With current implementation, kstat_cpu(cpu).irqs_sum is also
increased in case of irq_mis_count increment.
So there is no need to count irq_mis_count in arch_irq_stat,
otherwise irq_mis_count will be counted twice in the sum of
/proc/stat.

Reported-by: Liu Chuansheng <chuansheng.liu@...el.com>
Signed-off-by: Li Fei <fei.li@...el.com>
Acked-by: Liu Chuansheng <chuansheng.liu@...el.com>
---
 arch/x86/kernel/irq.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index e4595f1..84b7789 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -165,10 +165,6 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
 u64 arch_irq_stat(void)
 {
 	u64 sum = atomic_read(&irq_err_count);
-
-#ifdef CONFIG_X86_IO_APIC
-	sum += atomic_read(&irq_mis_count);
-#endif
 	return sum;
 }
 
-- 
1.7.4.1



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