ptr_clear_bit    1277 arch/x86/include/asm/pgtable.h 	return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
ptr_clear_bit    1287 arch/x86/include/asm/pgtable.h 	return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);