1. 根目录:
2. arch
3. sparc
4. include
5. asm
6. sparsemem.h

#ifndef _SPARC64_SPARSEMEM_H
#define _SPARC64_SPARSEMEM_H

#ifdef __KERNEL__

#define SECTION_SIZE_BITS       30
#define MAX_PHYSADDR_BITS       42
#define MAX_PHYSMEM_BITS        42

#endif /* !(__KERNEL__) */

#endif /* !(_SPARC64_SPARSEMEM_H) */