PM / Hibernate: Remove arch_prepare_suspend()

All architectures supporting hibernation define
arch_prepare_suspend() as an empty function, so remove it.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

arch/frv/include/asm/suspend.h

-/* suspend.h: suspension stuff
- *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef _ASM_SUSPEND_H
-#define _ASM_SUSPEND_H
-
-static inline int arch_prepare_suspend(void)
-{
-	return 0;
-}
-
-#endif /* _ASM_SUSPEND_H */

arch/mips/include/asm/suspend.h

 #ifndef __ASM_SUSPEND_H
 #define __ASM_SUSPEND_H
 
-static inline int arch_prepare_suspend(void) { return 0; }
-
 /* References to section boundaries */
 extern const void __nosave_begin, __nosave_end;
 

arch/powerpc/include/asm/suspend.h

-#ifndef __ASM_POWERPC_SUSPEND_H
-#define __ASM_POWERPC_SUSPEND_H
-
-static inline int arch_prepare_suspend(void) { return 0; }
-
-#endif /* __ASM_POWERPC_SUSPEND_H */

arch/powerpc/kernel/swsusp.c

@@ -10,7 +10,6 @@
  */
 
 #include <linux/sched.h>
-#include <asm/suspend.h>
 #include <asm/system.h>
 #include <asm/current.h>
 #include <asm/mmu_context.h>

arch/s390/include/asm/suspend.h

-#ifndef __ASM_S390_SUSPEND_H
-#define __ASM_S390_SUSPEND_H
-
-static inline int arch_prepare_suspend(void)
-{
-	return 0;
-}
-
-#endif
-

arch/sh/include/asm/suspend.h

@@ -3,7 +3,6 @@
 
 #ifndef __ASSEMBLY__
 #include <linux/notifier.h>
-static inline int arch_prepare_suspend(void) { return 0; }
 
 #include <asm/ptrace.h>
 

arch/unicore32/include/asm/suspend.h

@@ -14,7 +14,6 @@
 #define __UNICORE_SUSPEND_H__
 
 #ifndef __ASSEMBLY__
-static inline int arch_prepare_suspend(void) { return 0; }
 
 #include <asm/ptrace.h>
 

arch/x86/include/asm/suspend_32.h

@@ -9,8 +9,6 @@
 #include <asm/desc.h>
 #include <asm/i387.h>
 
-static inline int arch_prepare_suspend(void) { return 0; }
-
 /* image of the saved processor state */
 struct saved_context {
 	u16 es, fs, gs, ss;

arch/x86/include/asm/suspend_64.h

@@ -9,11 +9,6 @@
 #include <asm/desc.h>
 #include <asm/i387.h>
 
-static inline int arch_prepare_suspend(void)
-{
-	return 0;
-}
-
 /*
  * Image of the saved processor state, used by the low level ACPI suspend to
  * RAM code and by the low level hibernation code.

kernel/power/hibernate.c

@@ -25,7 +25,6 @@
 #include <linux/gfp.h>
 #include <linux/syscore_ops.h>
 #include <scsi/scsi_scan.h>
-#include <asm/suspend.h>
 
 #include "power.h"
 
@@ -244,10 +243,6 @@ static int create_image(int platform_mode)
 {
 	int error;
 
-	error = arch_prepare_suspend();
-	if (error)
-		return error;
-
 	error = dpm_suspend_noirq(PMSG_FREEZE);
 	if (error) {
 		printk(KERN_ERR "PM: Some devices failed to power down, "