From 10f9014912a2b1cb59c39cdea777e6d9afa8f17e Mon Sep 17 00:00:00 2001 From: Don Zickus Date: Fri, 7 May 2010 17:11:49 -0400 Subject: [PATCH] x86: Cleanup hw_nmi.c cruft The design of the hardlockup watchdog has changed and cruft was left behind in the hw_nmi.c file. Just remove the code that isn't used anymore. Signed-off-by: Don Zickus Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Cyrill Gorcunov Cc: Eric Paris Cc: Randy Dunlap LKML-Reference: <1273266711-18706-7-git-send-email-dzickus@redhat.com> Signed-off-by: Frederic Weisbecker --- arch/x86/kernel/apic/hw_nmi.c | 58 ------------------------------------------- 1 file changed, 58 deletions(-) diff --git a/arch/x86/kernel/apic/hw_nmi.c b/arch/x86/kernel/apic/hw_nmi.c index 8c3edfb..3b40082 100644 --- a/arch/x86/kernel/apic/hw_nmi.c +++ b/arch/x86/kernel/apic/hw_nmi.c @@ -9,74 +9,16 @@ * */ -#include -#include #include -#include -#include -#include -#include -#include #include #include #include - - #include #include /* For reliability, we're prepared to waste bits here. */ static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly; -static DEFINE_PER_CPU(unsigned, last_irq_sum); - -/* - * Take the local apic timer and PIT/HPET into account. We don't - * know which one is active, when we have highres/dyntick on - */ -static inline unsigned int get_timer_irqs(int cpu) -{ - unsigned int irqs = per_cpu(irq_stat, cpu).irq0_irqs; - -#if defined(CONFIG_X86_LOCAL_APIC) - irqs += per_cpu(irq_stat, cpu).apic_timer_irqs; -#endif - - return irqs; -} - -static inline int mce_in_progress(void) -{ -#if defined(CONFIG_X86_MCE) - return atomic_read(&mce_entry) > 0; -#endif - return 0; -} - -int hw_nmi_is_cpu_stuck(struct pt_regs *regs) -{ - unsigned int sum; - int cpu = smp_processor_id(); - - /* if we are doing an mce, just assume the cpu is not stuck */ - /* Could check oops_in_progress here too, but it's safer not to */ - if (mce_in_progress()) - return 0; - - /* We determine if the cpu is stuck by checking whether any - * interrupts have happened since we last checked. Of course - * an nmi storm could create false positives, but the higher - * level logic should account for that - */ - sum = get_timer_irqs(cpu); - if (__get_cpu_var(last_irq_sum) == sum) { - return 1; - } else { - __get_cpu_var(last_irq_sum) = sum; - return 0; - } -} - u64 hw_nmi_get_sample_period(void) { return (u64)(cpu_khz) * 1000 * 60; -- 2.7.4