x86 kdump: make nmi_shootdown_cpus() non-static

Impact: make API available to the rest of x86 platform code

Add prototype to asm/reboot.h.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/include/asm/reboot.h

 #ifndef _ASM_X86_REBOOT_H
 #define _ASM_X86_REBOOT_H
 
+#include <linux/kdebug.h>
+
 struct pt_regs;
 
 struct machine_ops {
@@ -18,4 +20,7 @@ void native_machine_crash_shutdown(struct pt_regs *regs);
 void native_machine_shutdown(void);
 void machine_real_restart(const unsigned char *code, int length);
 
+typedef void (*nmi_shootdown_cb)(int, struct die_args*);
+void nmi_shootdown_cpus(nmi_shootdown_cb callback);
+
 #endif /* _ASM_X86_REBOOT_H */

arch/x86/kernel/crash.c

@@ -29,7 +29,6 @@
 
 #include <mach_ipi.h>
 
-typedef void (*nmi_shootdown_cb)(int, struct die_args*);
 
 #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
 
@@ -100,7 +99,7 @@ static struct notifier_block crash_nmi_nb = {
 	.notifier_call = crash_nmi_callback,
 };
 
-static void nmi_shootdown_cpus(nmi_shootdown_cb callback)
+void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 {
 	unsigned long msecs;