arch/arm64/mm/hugetlbpage.c:515:9: error: implicit declaration of function 'get_clear_flush'; did you mean 'ptep_clear_flush'? [-Werror=implicit-function-declaration] arch/arm64/mm/hugetlbpage.c:515:9: error: incompatible types when returning type 'int' but 'pte_t' was expected .arch/arm64/mm/hugetlbpage.c:516:1: error: control reaches end of non-void function [-Werror=return-type]