linux-kernel - [PATCH] x86: eliminate unused irq0

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Date:	Fri, 24 Feb 2012 11:50:27 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: eliminate unused irq0_irqs counter

As of 2.6.38 this counter is being maintained without ever being read.

Signed-off-by: Jan Beulich <jbeulich@...e.com>

---
 arch/x86/include/asm/hardirq.h |    1 -
 arch/x86/kernel/time.c         |    3 ---
 2 files changed, 4 deletions(-)

--- 3.3-rc4/arch/x86/include/asm/hardirq.h
+++ 3.3-rc4-x86-no-irq0_irqs/arch/x86/include/asm/hardirq.h
@@ -7,7 +7,6 @@
 typedef struct {
 	unsigned int __softirq_pending;
 	unsigned int __nmi_count;	/* arch dependent */
-	unsigned int irq0_irqs;
 #ifdef CONFIG_X86_LOCAL_APIC
 	unsigned int apic_timer_irqs;	/* arch dependent */
 	unsigned int irq_spurious_count;
--- 3.3-rc4/arch/x86/kernel/time.c
+++ 3.3-rc4-x86-no-irq0_irqs/arch/x86/kernel/time.c
@@ -57,9 +57,6 @@ EXPORT_SYMBOL(profile_pc);
  */
 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 {
-	/* Keep nmi watchdog up to date */
-	inc_irq_stat(irq0_irqs);
-
 	global_clock_event->event_handler(global_clock_event);
 
 	/* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */



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