[PATCH 9/23] x86_64: Implemenent machine_emergency_restart

[Eric W. Biederman]

It is not safe to call set_cpus_allowed() in interrupt
context and disabling the apics is complicated code.
So unconditionally skip machine_shutdown in machine_emergency_reboot
on x86_64.

Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
---

 arch/x86_64/kernel/reboot.c            |   18 +++++++++++-------
 include/asm-x86_64/emergency-restart.h |    2 +-
 2 files changed, 12 insertions(+), 8 deletions(-)

c274d84d274bd40c63be01cd6a4ba26ae2be135a
diff --git a/arch/x86_64/kernel/reboot.c b/arch/x86_64/kernel/reboot.c
--- a/arch/x86_64/kernel/reboot.c
+++ b/arch/x86_64/kernel/reboot.c
@@ -109,16 +109,10 @@ void machine_shutdown(void)
 	local_irq_enable();
 }
 
-void machine_restart(char * __unused)
+void machine_emergency_restart(void)
 {
 	int i;
 
-	printk("machine restart\n");
-
-	if (!reboot_force) {
-		machine_shutdown();
-	}
-	
 	/* Tell the BIOS if we want cold or warm reboot */
 	*((unsigned short *)__va(0x472)) = reboot_mode;
        
@@ -143,6 +137,16 @@ void machine_restart(char * __unused)
 	}      
 }
 
+void machine_restart(char * __unused)
+{
+	printk("machine restart\n");
+
+	if (!reboot_force) {
+		machine_shutdown();
+	}
+	machine_emergency_restart();
+}
+
 void machine_halt(void)
 {
 }
diff --git a/include/asm-x86_64/emergency-restart.h b/include/asm-x86_64/emergency-restart.h
--- a/include/asm-x86_64/emergency-restart.h
+++ b/include/asm-x86_64/emergency-restart.h
@@ -1,6 +1,6 @@
 #ifndef _ASM_EMERGENCY_RESTART_H
 #define _ASM_EMERGENCY_RESTART_H
 
-#include <asm-generic/emergency-restart.h>
+extern void machine_emergency_restart(void);
 
 #endif /* _ASM_EMERGENCY_RESTART_H */
-
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