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single element struct in the kernel

Hi
  The kernel seems to have many structs defined with just
a single element in them. Is it for encapsulation/abstraction ?.

In asm-i386/system.h:
struct __xchg_dummy { unsigned long a[100]; };
#define __xg(x) ((struct __xchg_dummy *)(x))

What is the rationale behind cast to a struct * when a cast to
ulong * was enough (see __xchg() && __cmpxchg() in the
same file) ? What is special about a[100] ?. 

regards
Chandran



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