[PATCH] Remove unused prepare_to_switch macro

Remove unused prepare_to_switch() macros.
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-cris/system.h

@@ -8,7 +8,6 @@
  */
 
 extern struct task_struct *resume(struct task_struct *prev, struct task_struct *next, int);
-#define prepare_to_switch()     do { } while(0)
 #define switch_to(prev,next,last) last = resume(prev,next, \
 					 (int)&((struct task_struct *)0)->thread)
 

include/asm-frv/system.h

@@ -18,8 +18,6 @@
 
 struct thread_struct;
 
-#define prepare_to_switch()    do { } while(0)
-
 /*
  * switch_to(prev, next) should switch from task `prev' to `next'
  * `prev' will never be the same as `next'.

include/asm-h8300/system.h

@@ -4,8 +4,6 @@
 #include <linux/config.h> /* get configuration macros */
 #include <linux/linkage.h>
 
-#define prepare_to_switch()	do { } while(0)
-
 /*
  * switch_to(n) should switch tasks to task ptr, first checking that
  * ptr isn't the current task, in which case it does nothing.  This

include/asm-m32r/system.h

@@ -22,10 +22,6 @@
  * `next' and `prev' should be struct task_struct, but it isn't always defined
  */
 
-#ifndef CONFIG_SMP
-#define prepare_to_switch()  do { } while(0)
-#endif	/* not CONFIG_SMP */
-
 #define switch_to(prev, next, last)  do { \
 	register unsigned long  arg0 __asm__ ("r0") = (unsigned long)prev; \
 	register unsigned long  arg1 __asm__ ("r1") = (unsigned long)next; \

include/asm-v850/system.h

@@ -18,8 +18,6 @@
 #include <asm/ptrace.h>
 
 
-#define prepare_to_switch()	do { } while (0)
-
 /*
  * switch_to(n) should switch tasks to task ptr, first checking that
  * ptr isn't the current task, in which case it does nothing.

include/asm-xtensa/system.h

@@ -111,8 +111,6 @@ extern void *_switch_to(void *last, void *next);
 
 #endif	/* __ASSEMBLY__ */
 
-#define prepare_to_switch()	do { } while(0)
-
 #define switch_to(prev,next,last)		\
 do {						\
 	clear_cpenable();			\