linux-kernel - [ 42/46] x86: Eliminate irq_mis_count counted in arch_irq

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Message-Id: <20130506225825.074956821@linuxfoundation.org>
Date:	Mon,  6 May 2013 15:58:48 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Liu Chuansheng <chuansheng.liu@...el.com>,
	Li Fei <fei.li@...el.com>, Ingo Molnar <mingo@...nel.org>,
	tomoki.sekiyama.qu@...achi.com, joe@...ches.com
Subject: [ 42/46] x86: Eliminate irq_mis_count counted in arch_irq_stat

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li Fei <fei.li@...el.com>

commit f7b0e1055574ce06ab53391263b4e205bf38daf3 upstream.

With the 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>
Cc: tomoki.sekiyama.qu@...achi.com
Cc: joe@...ches.com
Link: http://lkml.kernel.org/r/1366980611.32469.7.camel@fli24-HP-Compaq-8100-Elite-CMT-PC
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/irq.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -159,10 +159,6 @@ 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;
 }
 


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