x86_64: prepare shared kernel/crash.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 135 deletions

diff --git a/arch/x86_64/kernel/crash.c b/arch/x86_64/kernel/crash.c
deleted file mode 100644
index 13432a1ae904..000000000000
--- a/arch/x86_64/kernel/crash.c
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- * Architecture specific (x86_64) functions for kexec based crash dumps.
- *
- * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
- *
- * Copyright (C) IBM Corporation, 2004. All rights reserved.
- *
- */
-
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/smp.h>
-#include <linux/irq.h>
-#include <linux/reboot.h>
-#include <linux/kexec.h>
-#include <linux/delay.h>
-#include <linux/elf.h>
-#include <linux/elfcore.h>
-#include <linux/kdebug.h>
-
-#include <asm/processor.h>
-#include <asm/hardirq.h>
-#include <asm/nmi.h>
-#include <asm/hw_irq.h>
-#include <asm/mach_apic.h>
-
-/* This keeps a track of which one is crashing cpu. */
-static int crashing_cpu;
-
-#ifdef CONFIG_SMP
-static atomic_t waiting_for_crash_ipi;
-
-static int crash_nmi_callback(struct notifier_block *self,
-                                unsigned long val, void *data)
-{
-        struct pt_regs *regs;
-        int cpu;
-
-        if (val != DIE_NMI_IPI)
-                return NOTIFY_OK;
-
-        regs = ((struct die_args *)data)->regs;
-        cpu = raw_smp_processor_id();
-
-        /*
-         * Don't do anything if this handler is invoked on crashing cpu.
-         * Otherwise, system will completely hang. Crashing cpu can get
-         * an NMI if system was initially booted with nmi_watchdog parameter.
-         */
-        if (cpu == crashing_cpu)
-                return NOTIFY_STOP;
-        local_irq_disable();
-
-        crash_save_cpu(regs, cpu);
-        disable_local_APIC();
-        atomic_dec(&waiting_for_crash_ipi);
-        /* Assume hlt works */
-        for(;;)
-                halt();
-
-        return 1;
-}
-
-static void smp_send_nmi_allbutself(void)
-{
-        send_IPI_allbutself(NMI_VECTOR);
-}
-
-/*
- * This code is a best effort heuristic to get the
- * other cpus to stop executing. So races with
- * cpu hotplug shouldn't matter.
- */
-
-static struct notifier_block crash_nmi_nb = {
-        .notifier_call = crash_nmi_callback,
-};
-
-static void nmi_shootdown_cpus(void)
-{
-        unsigned long msecs;
-
-        atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
-        if (register_die_notifier(&crash_nmi_nb))
-                return;         /* return what? */
-
-        /*
-         * Ensure the new callback function is set before sending
-         * out the NMI
-         */
-        wmb();
-
-        smp_send_nmi_allbutself();
-
-        msecs = 1000; /* Wait at most a second for the other cpus to stop */
-        while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
-                mdelay(1);
-                msecs--;
-        }
-        /* Leave the nmi callback set */
-        disable_local_APIC();
-}
-#else
-static void nmi_shootdown_cpus(void)
-{
-        /* There are no cpus to shootdown */
-}
-#endif
-
-void machine_crash_shutdown(struct pt_regs *regs)
-{
-        /*
-         * This function is only called after the system
-         * has panicked or is otherwise in a critical state.
-         * The minimum amount of code to allow a kexec'd kernel
-         * to run successfully needs to happen here.
-         *
-         * In practice this means shooting down the other cpus in
-         * an SMP system.
-         */
-        /* The kernel is broken so disable interrupts */
-        local_irq_disable();
-
-        /* Make a note of crashing cpu. Will be used in NMI callback.*/
-        crashing_cpu = smp_processor_id();
-        nmi_shootdown_cpus();
-
-        if(cpu_has_apic)
-                 disable_local_APIC();
-
-        disable_IO_APIC();
-
-        crash_save_cpu(regs, smp_processor_id());
-}