FOLL_COW          169 mm/gup.c       	return pte_write(pte) || ((flags & FOLL_COW) && pte_dirty(pte));
FOLL_COW          681 mm/gup.c       		*flags |= FOLL_COW;
FOLL_COW          948 mm/huge_memory.c 	WARN_ONCE(flags & FOLL_COW, "mm: In follow_devmap_pmd with FOLL_COW set");
FOLL_COW         1462 mm/huge_memory.c 	return pmd_write(pmd) || ((flags & FOLL_COW) && pmd_dirty(pmd));