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PAGE_OFFSET66include/asm-alpha/page.h#define PAGE_OFFSET    0xFFFFFC0000000000
PAGE_OFFSET60include/asm-i386/page.h#define PAGE_OFFSET    0
PAGE_OFFSET117include/asm-mips/page.h#define PAGE_OFFSET  KERNELBASE
PAGE_OFFSET87include/asm-sparc/page.h#define PAGE_OFFSET    0