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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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5e85391b3b
On some configs the following build error triggers: arch/x86/kernel/apic/hw_nmi.c:35: error: 'apic' undeclared (first use in this function) arch/x86/kernel/apic/hw_nmi.c:35: error: (Each undeclared identifier is reported only once arch/x86/kernel/apic/hw_nmi.c:35: error: for each function it appears in.) Because asm/apic.h was only included implicitly. Include it explicitly. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Cyrill Gorcunov <gorcunov@gmail.com> LKML-Reference: <1273713674-8434-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* HW NMI watchdog support
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*
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* started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
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*
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* Arch specific calls to support NMI watchdog
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*
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* Bits copied from original nmi.c file
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*
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*/
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#include <asm/apic.h>
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#include <linux/cpumask.h>
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#include <linux/kdebug.h>
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#include <linux/notifier.h>
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#include <linux/kprobes.h>
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#include <linux/nmi.h>
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#include <linux/module.h>
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/* For reliability, we're prepared to waste bits here. */
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static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
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u64 hw_nmi_get_sample_period(void)
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{
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return (u64)(cpu_khz) * 1000 * 60;
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}
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#ifdef ARCH_HAS_NMI_WATCHDOG
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void arch_trigger_all_cpu_backtrace(void)
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{
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int i;
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cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
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printk(KERN_INFO "sending NMI to all CPUs:\n");
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apic->send_IPI_all(NMI_VECTOR);
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/* Wait for up to 10 seconds for all CPUs to do the backtrace */
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for (i = 0; i < 10 * 1000; i++) {
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if (cpumask_empty(to_cpumask(backtrace_mask)))
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break;
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mdelay(1);
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}
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}
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static int __kprobes
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arch_trigger_all_cpu_backtrace_handler(struct notifier_block *self,
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unsigned long cmd, void *__args)
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{
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struct die_args *args = __args;
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struct pt_regs *regs;
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int cpu = smp_processor_id();
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switch (cmd) {
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case DIE_NMI:
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case DIE_NMI_IPI:
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break;
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default:
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return NOTIFY_DONE;
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}
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regs = args->regs;
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if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
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static arch_spinlock_t lock = __ARCH_SPIN_LOCK_UNLOCKED;
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arch_spin_lock(&lock);
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printk(KERN_WARNING "NMI backtrace for cpu %d\n", cpu);
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show_regs(regs);
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dump_stack();
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arch_spin_unlock(&lock);
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cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
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return NOTIFY_STOP;
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}
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return NOTIFY_DONE;
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}
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static __read_mostly struct notifier_block backtrace_notifier = {
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.notifier_call = arch_trigger_all_cpu_backtrace_handler,
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.next = NULL,
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.priority = 1
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};
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static int __init register_trigger_all_cpu_backtrace(void)
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{
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register_die_notifier(&backtrace_notifier);
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return 0;
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}
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early_initcall(register_trigger_all_cpu_backtrace);
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#endif
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/* STUB calls to mimic old nmi_watchdog behaviour */
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#if defined(CONFIG_X86_LOCAL_APIC)
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unsigned int nmi_watchdog = NMI_NONE;
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EXPORT_SYMBOL(nmi_watchdog);
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void acpi_nmi_enable(void) { return; }
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void acpi_nmi_disable(void) { return; }
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#endif
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atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */
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EXPORT_SYMBOL(nmi_active);
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int unknown_nmi_panic;
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void cpu_nmi_set_wd_enabled(void) { return; }
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void stop_apic_nmi_watchdog(void *unused) { return; }
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void setup_apic_nmi_watchdog(void *unused) { return; }
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int __init check_nmi_watchdog(void) { return 0; }
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