pgd_clear          52 arch/x86/kernel/head64.c 	pgd_clear(pgd);
pgd_clear         103 arch/x86/kernel/machine_kexec_64.c 		pgd_clear(level4p++);
pgd_clear          23 include/asm-generic/4level-fixup.h #define pud_clear(pud)			pgd_clear(pud)
pgd_clear         119 mm/memory.c    	pgd_clear(pgd);
pgd_clear         208 mm/memory.c    	pgd_clear(pgd);