remove_vm_area
p = remove_vm_area((void *) (PAGE_MASK & (unsigned long __force) addr));
vma = remove_vm_area((void *)(map->sq_addr & PAGE_MASK));
o = remove_vm_area((void __force *)addr);
extern struct vm_struct *remove_vm_area(const void *addr);
vm = remove_vm_area(addr);
vm = remove_vm_area(addr);
ret = remove_vm_area(area->addr);