shmem_anon_vm_ops
static const struct vm_operations_struct shmem_anon_vm_ops;
return vma->vm_ops == &shmem_anon_vm_ops;
desc->vm_ops = &shmem_anon_vm_ops;
static const struct vm_operations_struct shmem_anon_vm_ops = {
vma->vm_ops = &shmem_anon_vm_ops;
desc->vm_ops = &shmem_anon_vm_ops;