1#ifndef _ASM_X86_64_SPARSEMEM_H 2#define _ASM_X86_64_SPARSEMEM_H 1 3 4#ifdef CONFIG_SPARSEMEM 5 6/* 7 * generic non-linear memory support: 8 * 9 * 1) we will not split memory into more chunks than will fit into the flags 10 * field of the struct page 11 * 12 * SECTION_SIZE_BITS 2^n: size of each section 13 * MAX_PHYSADDR_BITS 2^n: max size of physical address space 14 * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space 15 * 16 */ 17 18#define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ 19#define MAX_PHYSADDR_BITS 40 20#define MAX_PHYSMEM_BITS 40 21 22extern int early_pfn_to_nid(unsigned long pfn); 23 24#endif /* CONFIG_SPARSEMEM */ 25 26#endif /* _ASM_X86_64_SPARSEMEM_H */ 27