[tip:perf/urgent] x86: Eliminate irq_mis_count counted in arch_irq_stat

From: tip-bot for Li Fei
Date: Tue Apr 30 2013 - 12:45:45 EST

Commit-ID: f7b0e1055574ce06ab53391263b4e205bf38daf3
Gitweb: http://git.kernel.org/tip/f7b0e1055574ce06ab53391263b4e205bf38daf3
Author: Li Fei <fei.li@xxxxxxxxx>
AuthorDate: Fri, 26 Apr 2013 20:50:11 +0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 30 Apr 2013 10:56:37 +0200

x86: Eliminate irq_mis_count counted in arch_irq_stat

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

Reported-by: Liu Chuansheng <chuansheng.liu@xxxxxxxxx>
Signed-off-by: Li Fei <fei.li@xxxxxxxxx>
Acked-by: Liu Chuansheng <chuansheng.liu@xxxxxxxxx>
Cc: tomoki.sekiyama.qu@xxxxxxxxxxx
Cc: joe@xxxxxxxxxxx
Link: 1366980611.32469.7.camel@fli24-HP-Compaq-8100-Elite-CMT-PC">http://lkml.kernel.org/r/1366980611.32469.7.camel@fli24-HP-Compaq-8100-Elite-CMT-PC
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
arch/x86/kernel/irq.c | 4 ----
1 file changed, 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);
return sum;

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