linux_old1/include/asm-x86/page_64.h

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#ifndef _X86_64_PAGE_H
#define _X86_64_PAGE_H
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#endif /* !__ASSEMBLY__ */
#ifndef __ASSEMBLY__
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn) ((pfn) < end_pfn)
#endif
#endif /* _X86_64_PAGE_H */