cpu_idle() is referenced from generic code (init/main.c).  It is
declared/defined in

init/main.c:				void cpu_idle(void)

i386/kernel/process.c			void cpu_idle(void)
i386/kernel/smpboot.c:			int  cpu_idle(void)
i386/mach-voyager/voyager_smp.c:	int  cpu_idle(void)

ppc/kernel/idle.c:			int  cpu_idle(void)
ppc/kernel/smp.c:			int  cpu_idle(void *unused)

ppc64/kernel/idle.c:			int  cpu_idle(void)
ppc64/kernel/smp.c:			int  cpu_idle(void *unused)

sparc/kernel/process.c:			int  cpu_idle(void)

sparc64/kernel/process.c:		int  cpu_idle(void)

sh/kernel/process.c:			void cpu_idle(void *unused)
sh/kernel/smp.c:			int  cpu_idle(void *unused)

ia64/kernel/smpboot.c:			int  cpu_idle(void)
ia64/kernel/process.c:			void cpu_idle(void *unused)

sh64/kernel/process.c:			void cpu_idle(void *unused)

s390/kernel/process.c:			int  cpu_idle(void)
s390/kernel/smp.c:			int  cpu_idle(void * unused)

m32r/kernel/process.c:			void cpu_idle(void)
m32r/kernel/smpboot.c			int  cpu_idle(void)

Other arches beleive that cpu_idle is void(void).

This patch puts 'void cpu_idle(void)' in include/linux/smp.h
and fixes conflicting definitions.

Also removes now unneeded declarations in x86_64, alpha, parisc.

Only i386 part is tested.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>