linux-kernel - [PATCH 7/11] Vmi timer race

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Date:	Mon, 5 Feb 2007 19:53:16 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>
Subject: [PATCH 7/11] Vmi timer race

Because timer code moves around, and we might eventually move our init to a
late_time_init hook, save and restore IRQs around this code because it is
definitely not interrupt safe.

Signed-off-by: Zachary Amsden <zach@...are.com>

diff -r dd4d4324a5b3 arch/i386/kernel/vmitime.c
--- a/arch/i386/kernel/vmitime.c	Thu Feb 01 23:53:06 2007 -0800
+++ b/arch/i386/kernel/vmitime.c	Fri Feb 02 00:03:05 2007 -0800
@@ -178,7 +178,9 @@ void __init vmi_time_init(void)
 void __init vmi_time_init(void)
 {
 	unsigned long long cycles_per_sec, cycles_per_msec;
-
+	unsigned long flags;
+
+	local_irq_save(flags);
 	setup_irq(0, &vmi_timer_irq);
 #ifdef CONFIG_X86_LOCAL_APIC
 	set_intr_gate(LOCAL_TIMER_VECTOR, apic_vmi_timer_interrupt);
@@ -222,6 +224,8 @@ void __init vmi_time_init(void)
 		      VMI_ALARM_WIRED_IRQ0 | VMI_ALARM_IS_PERIODIC | VMI_CYCLES_AVAILABLE,
 		      per_cpu(process_times_cycles_accounted_cpu, 0) + cycles_per_alarm,
 		      cycles_per_alarm);
+
+	local_irq_restore(flags);
 }
 
 #ifdef CONFIG_X86_LOCAL_APIC
-
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