SWP_TYPE_BITS     102 arch/x86/include/asm/pgtable-2level.h #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
SWP_TYPE_BITS     148 arch/x86/include/asm/pgtable_64.h #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)