PGD_KERNEL_START   39 arch/x86/include/asm/pgtable-2level_types.h #define PGD_KERNEL_START	(CONFIG_PAGE_OFFSET >> PGDIR_SHIFT)
PGD_KERNEL_START   49 arch/x86/include/asm/pgtable-3level_types.h #define PGD_KERNEL_START	(CONFIG_PAGE_OFFSET >> PGDIR_SHIFT)
PGD_KERNEL_START  160 arch/x86/include/asm/pgtable_64_types.h #define PGD_KERNEL_START	((PAGE_SIZE / 2) / sizeof(pgd_t))