[linux-kernel]Why there are so many struct rw_semaphore being defined?

I see struct rw_semaphore is defined in
include/linux/rwsem-spinlock.h,in the meanwhile, I also can find it in
include/asm-**/rwsem.h,for
example,include/asm-i386/rwsem.h,include/asm-x86_64/rwsem.h,why?which
one should be used?

Thanks
Jason Xiao
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