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[PATCH] kexec: x86_64: factor out apic shutdown code

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Factor out the apic and smp shutdown code from machine_restart so it can be
called by in the kexec reboot path as well.

Signed-off-by: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman 2005-06-25 14:58:02 -07:00 committed by Linus Torvalds
parent 1bc3b91aee
commit d89559589a
1 changed files with 35 additions and 31 deletions
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66
arch/x86_64/kernel/reboot.c
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@ -66,34 +66,6 @@ static int __init reboot_setup(char *str)
__setup("reboot=", reboot_setup);
#ifdef CONFIG_SMP
static void smp_halt(void)
{
int cpuid = safe_smp_processor_id();
static int first_entry = 1;
if (reboot_force)
return;
if (first_entry) {
first_entry = 0;
smp_call_function((void *)machine_restart, NULL, 1, 0);
}
smp_stop_cpu();
/* AP calling this. Just halt */
if (cpuid != boot_cpu_id) {
for (;;)
asm("hlt");
}
/* Wait for all other CPUs to have run smp_stop_cpu */
while (!cpus_empty(cpu_online_map))
rep_nop();
}
#endif
static inline void kb_wait(void)
{
int i;
@ -103,15 +75,47 @@ static inline void kb_wait(void)
break;
}
void machine_shutdown(void)
{
/* Stop the cpus and apics */
#ifdef CONFIG_SMP
int reboot_cpu_id;
/* The boot cpu is always logical cpu 0 */
reboot_cpu_id = 0;
/* Make certain the cpu I'm about to reboot on is online */
if (!cpu_isset(reboot_cpu_id, cpu_online_map)) {
reboot_cpu_id = smp_processor_id();
}
/* Make certain I only run on the appropriate processor */
set_cpus_allowed(current, cpumask_of_cpu(reboot_cpu_id));
/* O.K Now that I'm on the appropriate processor,
* stop all of the others.
*/
smp_send_stop();
#endif
local_irq_disable();
#ifndef CONFIG_SMP
disable_local_APIC();
#endif
disable_IO_APIC();
local_irq_enable();
}
void machine_restart(char * __unused)
{
int i;
printk("machine restart\n");
#ifdef CONFIG_SMP
smp_halt();
#endif
machine_shutdown();
if (!reboot_force) {
local_irq_disable();