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#ifndef _ASM_X86_SPARSEMEM_H #define _ASM_X86_SPARSEMEM_H #ifdef CONFIG_SPARSEMEM /* * generic non-linear memory support: * * 1) we will not split memory into more chunks than will fit into the flags * field of the struct page * * SECTION_SIZE_BITS 2^n: size of each section * MAX_PHYSADDR_BITS 2^n: max size of physical address space * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space * */ #ifdef CONFIG_X86_32 # ifdef CONFIG_X86_PAE # define SECTION_SIZE_BITS 29 # define MAX_PHYSADDR_BITS 36 # define MAX_PHYSMEM_BITS 36 # else # define SECTION_SIZE_BITS 26 # define MAX_PHYSADDR_BITS 32 # define MAX_PHYSMEM_BITS 32 # endif #else /* CONFIG_X86_32 */ # define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ # define MAX_PHYSADDR_BITS 44 # define MAX_PHYSMEM_BITS 46 #endif #endif /* CONFIG_SPARSEMEM */ #endif /* _ASM_X86_SPARSEMEM_H */