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Commit b99dacab authored by Alistair Delva's avatar Alistair Delva
Browse files

ANDROID: GKI: Update cuttlefish whitelist



This has fallen out of sync with other whitelists wrt incfs and other
features, breaking boot on arm64.

Bug: 159343293
Signed-off-by: default avatarAlistair Delva <adelva@google.com>
Change-Id: I5ee581934e17f9ca1cfeb4fb046ff3c342ccb0c6
parent fa2e80be
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+386 −215
Original line number Diff line number Diff line
@@ -8,87 +8,108 @@
  __arch_copy_from_user
  __arch_copy_to_user
  arm64_const_caps_ready
  bus_register
  bus_unregister
  bcmp
  blk_queue_max_segment_size
  bpf_trace_run2
  bpf_trace_run8
  cancel_delayed_work
  cancel_delayed_work_sync
  capable
  cfg80211_inform_bss_data
  cfg80211_put_bss
  __cfi_slowpath
  __check_object_size
  complete
  __const_udelay
  consume_skb
  cpu_hwcap_keys
  cpu_hwcaps
  cpumask_next
  cpu_number
  __cpu_online_mask
  cpus_read_lock
  cpus_read_unlock
  delayed_work_timer_fn
  destroy_workqueue
  _dev_err
  device_create_file
  device_register
  device_remove_file
  device_unregister
  _dev_info
  __dev_kfree_skb_any
  devm_ioremap_resource
  devm_kfree
  devm_kmalloc
  devm_request_threaded_irq
  _dev_notice
  dev_queue_xmit
  dev_set_name
  _dev_warn
  dma_alloc_from_dev_coherent
  dma_buf_export
  dma_buf_fd
  dma_buf_put
  dma_fence_release
  dma_fence_wait_timeout
  dma_release_from_dev_coherent
  down_read
  down_write
  dummy_dma_ops
  ethtool_op_get_link
  eth_validate_addr
  event_triggers_call
  fd_install
  find_next_bit
  find_next_zero_bit
  finish_wait
  flush_work
  fput
  free_irq
  free_netdev
  __free_pages
  get_device
  get_random_bytes
  get_unused_fd_flags
  hwrng_register
  hwrng_unregister
  ida_alloc_range
  ida_free
  init_net
  __init_rwsem
  init_timer_key
  init_wait_entry
  __init_waitqueue_head
  jiffies
  jiffies_to_usecs
  kfree
  kfree_skb
  __kmalloc
  kmalloc_caches
  kmem_cache_alloc
  kmem_cache_alloc_trace
  kmem_cache_create
  kmem_cache_destroy
  kmem_cache_free
  kmemdup
  kobject_create_and_add
  kobject_put
  kvfree
  kvmalloc_node
  kstrdup
  kstrtoull
  ktime_get
  __list_add_valid
  __list_del_entry_valid
  __ll_sc_atomic64_add
  __ll_sc_atomic64_andnot
  __ll_sc_atomic64_fetch_or
  __ll_sc_atomic64_or
  __ll_sc_atomic_add
  __ll_sc_atomic_add_return
  __ll_sc_atomic_sub_return
  __ll_sc___cmpxchg_case_mb_4
  __local_bh_enable_ip
  lock_sock_nested
  memcpy
  memset
  memstart_addr
  memzero_explicit
  misc_deregister
  misc_register
  module_put
  mod_timer
  module_layout
  __msecs_to_jiffies
  msleep
  __mutex_init
  mutex_lock
  mutex_lock_interruptible
  mutex_trylock
  mutex_unlock
  netdev_err
  netdev_info
@@ -100,22 +121,29 @@
  netif_device_detach
  netif_tx_stop_all_queues
  netif_tx_wake_queue
  no_llseek
  noop_llseek
  nr_cpu_ids
  of_find_property
  of_get_property
  of_property_read_variable_u32_array
  param_ops_bool
  param_ops_charp
  param_ops_int
  param_ops_uint
  passthru_features_check
  pci_bus_type
  pci_disable_device
  pci_enable_device
  pci_iomap
  pci_read_config_dword
  __pci_register_driver
  pci_request_region
  pci_set_master
  pci_unregister_driver
  __per_cpu_offset
  perf_trace_buf_alloc
  perf_trace_run_bpf_submit
  platform_bus_type
  platform_device_add
  platform_device_alloc
  platform_device_del
@@ -123,16 +151,23 @@
  platform_device_unregister
  __platform_driver_register
  platform_driver_unregister
  platform_get_irq
  platform_get_resource
  pm_runtime_enable
  __pm_runtime_idle
  __pm_runtime_resume
  preempt_schedule
  preempt_schedule_notrace
  prepare_to_wait_event
  printk
  __put_cred
  put_device
  __put_page
  __put_task_struct
  put_unused_fd
  queue_delayed_work_on
  queue_work_on
  _raw_read_lock
  _raw_read_unlock
  ___ratelimit
  _raw_spin_lock
  _raw_spin_lock_bh
  _raw_spin_lock_irq
@@ -146,11 +181,11 @@
  refcount_dec_and_test_checked
  refcount_inc_checked
  register_netdev
  register_shrinker
  register_virtio_device
  register_virtio_driver
  release_sock
  remove_wait_queue
  request_threaded_irq
  reservation_object_add_excl_fence
  rtnl_lock
  rtnl_unlock
  schedule
@@ -169,7 +204,6 @@
  snd_pcm_alt_chmaps
  snprintf
  sprintf
  sscanf
  __stack_chk_fail
  __stack_chk_guard
  strcmp
@@ -177,9 +211,11 @@
  strlcpy
  strlen
  strncpy
  strsep
  strstr
  synchronize_irq
  synchronize_net
  sysfs_create_groups
  system_wq
  trace_define_field
  trace_event_buffer_commit
@@ -188,69 +224,82 @@
  trace_event_raw_init
  trace_event_reg
  trace_handle_return
  trace_print_symbols_seq
  trace_raw_output_prep
  trace_seq_printf
  __udelay
  unregister_netdev
  unregister_netdevice_queue
  unregister_virtio_device
  unregister_virtio_driver
  up_read
  up_write
  vmap
  vunmap
  usleep_range
  vfree
  virtio_check_driver_offered_feature
  virtio_config_changed
  virtqueue_add_inbuf
  virtqueue_add_outbuf
  virtqueue_add_sgs
  virtqueue_detach_unused_buf
  virtqueue_disable_cb
  virtqueue_enable_cb
  virtqueue_get_avail_addr
  virtqueue_get_buf
  virtqueue_get_desc_addr
  virtqueue_get_used_addr
  virtqueue_get_vring_size
  virtqueue_is_broken
  virtqueue_kick
  virtqueue_kick_prepare
  virtqueue_notify
  vmalloc
  vring_create_virtqueue
  vring_del_virtqueue
  vring_interrupt
  vring_transport_features
  wait_woken
  __wake_up
  __warn_printk
  woken_wake_function
  ww_mutex_lock_interruptible
  ww_mutex_unlock

# required by binfmt_misc.ko
  bin2hex
  bprm_change_interp
  clear_inode
  __close_fd
  copy_strings_kernel
  _ctype
  current_time
  d_drop
  default_llseek
  dentry_open
  d_instantiate
  dput
  drop_nlink
  filp_close
  free_pages
  __get_free_pages
  get_next_ino
  iput
  kernel_read
  kill_litter_super
  kstrtoint
  lockref_get
  lookup_one_len
  mount_single
  new_inode
  open_exec
  prepare_binprm
  _raw_write_lock
  _raw_write_unlock
  __register_binfmt
  register_filesystem
  remove_arg_zero
  search_binary_handler
  simple_fill_super
  simple_pin_fs
  simple_read_from_buffer
  simple_release_fs
  simple_statfs
  strchr
  string_unescape
  strrchr
  unregister_binfmt
  unregister_filesystem
  would_dump
# required by ac97_bus.ko
  bus_register
  bus_unregister

# required by blk-mq-virtio.ko
  blk_mq_map_queues
# required by arm-smmu.ko
  alloc_io_pgtable_ops
  amba_bustype
  bus_set_iommu
  devm_free_irq
  driver_find_device
  driver_for_each_device
  free_io_pgtable_ops
  generic_device_group
  iommu_alloc_resv_region
  iommu_device_link
  iommu_device_register
  iommu_device_sysfs_add
  iommu_device_unlink
  iommu_dma_get_resv_regions
  iommu_fwspec_add_ids
  iommu_fwspec_free
  iommu_fwspec_init
  iommu_get_dma_cookie
  iommu_group_get_for_dev
  iommu_group_put
  iommu_group_ref_get
  iommu_group_remove_device
  iommu_present
  iommu_put_dma_cookie
  of_device_get_match_data
  of_dma_is_coherent
  of_phandle_iterator_args
  of_phandle_iterator_init
  of_phandle_iterator_next
  pci_device_group
  pci_for_each_dma_alias
  pci_request_acs

# required by dummy-cpufreq.ko
  cpufreq_generic_attr
@@ -258,10 +307,7 @@
  cpufreq_unregister_driver

# required by dummy_hcd.ko
  device_remove_file
  ktime_get_ts64
  memzero_explicit
  mod_timer
  platform_device_add_data
  scnprintf
  sg_miter_next
@@ -287,7 +333,6 @@
  usb_put_dev
  usb_put_hcd
  usb_remove_hcd
  usleep_range

# required by failover.ko
  netdev_master_upper_dev_link
@@ -298,9 +343,6 @@
# required by gnss-cmdline.ko
  bus_find_device_by_name
  device_find_child
  kstrdup
  platform_bus_type
  strsep

# required by gnss-serial.ko
  gnss_allocate_device
@@ -308,11 +350,8 @@
  gnss_insert_raw
  gnss_put_device
  gnss_register_device
  of_property_read_variable_u32_array
  __ll_sc___cmpxchg_case_mb_4
  __pm_runtime_disable
  pm_runtime_enable
  __pm_runtime_idle
  __pm_runtime_resume
  serdev_device_close
  serdev_device_open
  serdev_device_set_baudrate
@@ -321,33 +360,114 @@
  serdev_device_write
  serdev_device_write_wakeup

# required by incrementalfs.ko
  bin2hex
  __break_lease
  clear_inode
  __close_fd
  crc32_le
  crypto_alloc_shash
  crypto_destroy_tfm
  crypto_shash_digest
  d_add
  d_drop
  deactivate_locked_super
  dentry_open
  dget_parent
  d_instantiate
  d_make_root
  dput
  fget
  flush_dcache_page
  flush_delayed_work
  free_pages
  fs_kobj
  fsstack_copy_attr_all
  generic_file_llseek
  generic_file_mmap
  generic_file_read_iter
  generic_file_splice_read
  generic_read_dir
  generic_shutdown_super
  __get_free_pages
  get_zeroed_page
  iget5_locked
  ihold
  inode_init_once
  inode_init_owner
  iput
  iterate_dir
  kernel_read
  kernel_write
  kern_path
  __ll_sc___cmpxchg_case_rel_8
  lockref_get
  lock_rename
  lookup_one_len
  LZ4_decompress_safe
  match_int
  match_token
  notify_change
  pagecache_get_page
  path_get
  path_put
  register_filesystem
  seq_puts
  set_anon_super
  sget
  simple_getattr
  simple_setattr
  simple_statfs
  strndup_user
  sync_filesystem
  sysfs_create_group
  sysfs_remove_group
  truncate_inode_pages
  unlock_new_inode
  unlock_page
  unlock_rename
  unregister_filesystem
  user_path_at_empty
  vfs_create
  vfs_fallocate
  vfs_getattr
  vfs_getxattr
  vfs_link
  vfs_listxattr
  vfs_mkdir
  vfs_rename
  vfs_rmdir
  vfs_setxattr
  vfs_unlink

# required by ion-alloc.ko
  bpf_trace_run3
  contig_page_data
  down_read
  dma_buf_export
  dma_buf_fd
  dma_buf_put
  freezing_slow_path
  __init_rwsem
  kernel_kobj
  kobject_create_and_add
  kthread_create_on_node
  __ll_sc_atomic64_sub
  __ll_sc_atomic64_add_return
  __ll_sc_atomic64_sub_return
  mod_node_page_state
  plist_add
  ptr_to_hashval
  rb_erase
  rb_insert_color
  __refrigerator
  register_shrinker
  remap_pfn_range
  sched_setscheduler
  sg_alloc_table
  __sg_page_iter_next
  __sg_page_iter_start
  split_page
  sysfs_create_groups
  system_freezing_cnt
  totalram_pages
  vfree
  vmalloc
  vm_map_ram
  vm_unmap_ram
  vmap
  vunmap
  wake_up_process

# required by nd_virtio.ko
@@ -370,7 +490,6 @@
  netdev_change_features
  netdev_increment_features
  netdev_lower_state_changed
  pci_bus_type

# required by rtc-test.ko
  add_timer
@@ -402,9 +521,7 @@
  strcat

# required by snd-intel8x0.ko
  ktime_get
  param_ops_bint
  pci_iomap
  pci_release_regions
  pci_request_regions
  pci_write_config_dword
@@ -429,76 +546,119 @@
  snd_pcm_set_ops
  snd_pcm_suspend_all

# required by ttm.ko
  clear_page
  copy_page
# required by test_meminit.ko
  kmem_cache_alloc_bulk
  kmem_cache_free_bulk

# required by tpm.ko
  alloc_chrdev_region
  cdev_device_add
  cdev_device_del
  cdev_init
  __class_create
  class_destroy
  __compat_only_sysfs_link_entry_to_kobj
  del_timer_sync
  device_initialize
  devm_add_action
  efi
  hash_digest_size
  idr_alloc
  idr_destroy
  idr_get_next
  idr_remove
  idr_replace
  jiffies_to_msecs
  memremap
  memunmap
  of_property_match_string
  securityfs_create_dir
  securityfs_create_file
  securityfs_remove
  seq_lseek
  seq_open
  seq_putc
  seq_read
  seq_release
  seq_write
  sysfs_remove_link
  unregister_chrdev_region
  __usecs_to_jiffies

# required by tpm_vtpm_proxy.ko
  anon_inode_getfile

# required by ufshcd-core.ko
  async_schedule
  bio_crypt_should_process
  blk_queue_update_dma_pad
  bpf_trace_run4
  bpf_trace_run5
  cancel_work_sync
  clk_disable
  clk_enable
  clk_prepare
  clk_set_rate
  clk_unprepare
  dev_driver_string
  devres_add
  devres_destroy
  devres_free
  dma_buf_get
  dma_fence_enable_sw_signaling
  dma_fence_signal
  drm_class_device_register
  drm_class_device_unregister
  drm_clflush_pages
  drm_ht_create
  drm_ht_find_item
  drm_ht_insert_item
  drm_ht_just_insert_please
  drm_ht_remove
  drm_ht_remove_item
  drm_mm_init
  drm_mm_insert_node_in_range
  drm_mm_print
  drm_mm_remove_node
  drm_mm_takedown
  __drm_printfn_debug
  drm_vma_offset_add
  drm_vma_offset_lookup_locked
  drm_vma_offset_manager_destroy
  drm_vma_offset_manager_init
  drm_vma_offset_remove
  flush_workqueue
  __ioremap
  __iounmap
  kfree_call_rcu
  kobject_del
  kobject_init_and_add
  __ll_sc_atomic64_add_return_relaxed
  __ll_sc_atomic_sub
  __ll_sc___cmpxchg_case_mb_8
  mark_page_accessed
  __memcpy_fromio
  __memcpy_toio
  __memset_io
  nr_swap_pages
  refcount_inc_not_zero_checked
  reservation_object_add_shared_fence
  reservation_object_copy_fences
  reservation_object_reserve_shared
  reservation_object_test_signaled_rcu
  reservation_object_wait_timeout_rcu
  reservation_ww_class
  send_sig
  set_page_dirty
  shmem_file_setup
  shmem_read_mapping_page_gfp
  si_mem_available
  si_meminfo
  unmap_mapping_range
  unregister_shrinker
  vmalloc_to_page
  vm_get_page_prot
  vm_insert_mixed
  vm_insert_pfn
  ww_mutex_lock
  devfreq_add_device
  devfreq_remove_device
  devfreq_resume_device
  devfreq_suspend_device
  devm_clk_get
  devm_regulator_get
  dev_pm_opp_add
  dev_pm_opp_remove
  dmam_alloc_coherent
  down_read_trylock
  find_last_bit
  keyslot_manager_create
  keyslot_manager_destroy
  keyslot_manager_private
  keyslot_manager_reprogram_all_keys
  keyslot_manager_set_max_dun_bytes
  kstrtouint
  __ll_sc_atomic64_fetch_andnot_release
  __ll_sc_atomic64_fetch_or_acquire
  print_hex_dump
  regulator_count_voltages
  regulator_disable
  regulator_enable
  regulator_set_load
  regulator_set_voltage
  __scsi_add_device
  scsi_add_host_with_dma
  scsi_block_requests
  scsi_change_queue_depth
  scsi_device_get
  scsi_device_put
  scsi_dma_map
  scsi_dma_unmap
  __scsi_execute
  scsi_host_alloc
  scsi_host_put
  scsi_print_command
  scsi_print_sense_hdr
  scsi_remove_device
  scsi_remove_host
  scsi_report_bus_reset
  scsi_scan_host
  scsi_unblock_requests
  sdev_prefix_printk
  strncmp
  sysfs_remove_groups
  trace_print_hex_seq
  utf16s_to_utf8s
  wait_for_completion_timeout

# required by ufshcd-pltfrm.ko
  of_parse_phandle
  of_property_read_string_helper
  __pm_runtime_set_status

# required by virt_wifi.ko
  cfg80211_connect_done
  cfg80211_disconnected
  cfg80211_inform_bss_data
  cfg80211_put_bss
  cfg80211_scan_done
  __dev_get_by_index
  dev_printk
@@ -514,12 +674,19 @@
  wiphy_register
  wiphy_unregister

# required by virt_wifi_sim.ko
  ieee80211_get_channel
  release_firmware
  request_firmware

# required by virtio-gpu.ko
  bpf_trace_run2
  dma_buf_get_uuid
  dma_fence_context_alloc
  dma_fence_init
  dma_fence_match_context
  dma_fence_release
  dma_fence_signal_locked
  dma_fence_wait_timeout
  drm_add_edid_modes
  drm_add_modes_noedid
  drm_atomic_helper_check
@@ -561,14 +728,22 @@
  drm_dev_put
  drm_dev_register
  drm_dev_set_unique
  drm_dev_unregister
  drm_do_get_edid
  drm_encoder_cleanup
  drm_encoder_init
  drm_err
  drm_framebuffer_init
  drm_gem_dmabuf_mmap
  drm_gem_dmabuf_release
  drm_gem_dmabuf_vmap
  drm_gem_dmabuf_vunmap
  drm_gem_fb_create_handle
  drm_gem_fb_destroy
  drm_gem_handle_create
  drm_gem_map_attach
  drm_gem_map_detach
  drm_gem_map_dma_buf
  drm_gem_object_init
  drm_gem_object_lookup
  drm_gem_object_put_unlocked
@@ -578,6 +753,7 @@
  drm_gem_prime_handle_to_fd
  drm_gem_prime_import
  drm_gem_prime_mmap
  drm_gem_unmap_dma_buf
  drm_global_item_ref
  drm_global_item_unref
  drm_helper_hpd_irq_event
@@ -600,33 +776,47 @@
  drm_universal_plane_init
  __get_task_comm
  kmalloc_order_trace
  kmem_cache_alloc
  kmem_cache_create
  kmem_cache_destroy
  kmem_cache_free
  kvfree
  kvmalloc_node
  memdup_user
  put_unused_fd
  mutex_trylock
  reservation_object_add_excl_fence
  sg_alloc_table_from_pages
  sync_file_create
  sync_file_get_fence
  __tracepoint_dma_fence_emit
  ttm_bo_add_to_lru
  ttm_bo_del_sub_from_lru
  ttm_bo_device_init
  ttm_bo_device_release
  ttm_bo_dma_acc_size
  ttm_bo_eviction_valuable
  ttm_bo_global_init
  ttm_bo_global_release
  ttm_bo_init
  ttm_bo_init_mm
  ttm_bo_kmap
  ttm_bo_kunmap
  ttm_bo_manager_func
  ttm_bo_mmap
  ttm_bo_put
  ttm_bo_validate
  ttm_bo_wait
  ttm_dma_tt_fini
  ttm_dma_tt_init
  ttm_eu_backoff_reservation
  ttm_eu_fence_buffer_objects
  ttm_eu_reserve_buffers
  ttm_mem_global_init
  ttm_mem_global_release
  ttm_tt_init
  ww_mutex_lock_interruptible
  ww_mutex_unlock

# required by virtio-rng.ko
  complete
  hwrng_register
  hwrng_unregister
  wait_for_completion
  wait_for_completion_killable

# required by virtio.ko
  add_uevent_var
  device_add
  device_initialize
  driver_register
  driver_unregister
  ida_destroy
  panic

# required by virtio_blk.ko
  __alloc_disk_node
  blk_cleanup_queue
@@ -642,6 +832,7 @@
  blk_mq_start_stopped_hw_queues
  blk_mq_stop_hw_queue
  blk_mq_unquiesce_queue
  blk_mq_virtio_map_queues
  blk_put_request
  blk_queue_alignment_offset
  blk_queue_io_min
@@ -649,7 +840,6 @@
  blk_queue_logical_block_size
  blk_queue_max_hw_sectors
  blk_queue_max_segments
  blk_queue_max_segment_size
  blk_queue_physical_block_size
  blk_queue_write_cache
  blk_rq_map_kern
@@ -657,7 +847,6 @@
  blk_status_to_errno
  del_gendisk
  device_add_disk
  _dev_notice
  kobject_uevent_env
  memmove
  put_disk
@@ -668,24 +857,6 @@
  __sysfs_match_string
  unregister_blkdev

# required by virtio_crypto.ko
  cpu_bit_bitmap
  cpu_topology
  crypto_ablkcipher_type
  crypto_engine_alloc_init
  crypto_engine_exit
  crypto_engine_start
  crypto_finalize_ablkcipher_request
  crypto_register_alg
  crypto_transfer_ablkcipher_request_to_engine
  crypto_unregister_alg
  kzfree
  __ll_sc_atomic_add_return
  scatterwalk_map_and_copy
  sg_nents
  sg_nents_for_len
  try_module_get

# required by virtio_input.ko
  input_alloc_absinfo
  input_allocate_device
@@ -699,15 +870,14 @@
# required by virtio_mmio.ko
  device_for_each_child
  devm_ioremap
  devm_kfree
  __devm_request_region
  iomem_resource
  memparse
  platform_device_register_full
  platform_get_irq
  platform_get_resource
  sscanf

# required by virtio_net.ko
  arch_bpf_jit_check_func
  bpf_prog_add
  bpf_prog_put
  bpf_prog_sub
@@ -717,13 +887,15 @@
  __cpuhp_setup_state
  __cpuhp_state_add_instance
  __cpuhp_state_remove_instance
  cpumask_next
  cpumask_next_wrap
  cpus_read_lock
  cpus_read_unlock
  eth_commit_mac_addr_change
  eth_prepare_mac_addr_change
  ethtool_op_get_ts_info
  eth_type_trans
  flow_keys_basic_dissector
  kmemdup
  __napi_alloc_skb
  napi_complete_done
  napi_consume_skb
@@ -753,6 +925,11 @@
  skb_tstamp_tx
  __sw_hweight64
  __tracepoint_xdp_exception
  virtqueue_add_inbuf_ctx
  virtqueue_enable_cb_delayed
  virtqueue_enable_cb_prepare
  virtqueue_get_buf_ctx
  virtqueue_poll
  xdp_do_flush_map
  xdp_do_redirect
  xdp_return_frame
@@ -762,7 +939,6 @@
  xdp_rxq_info_unreg

# required by virtio_pci.ko
  get_device
  irq_set_affinity_hint
  pci_alloc_irq_vectors_affinity
  pci_find_capability
@@ -773,36 +949,31 @@
  pci_irq_get_affinity
  pci_irq_vector
  pci_read_config_byte
  pci_release_region
  pci_release_selected_regions
  pci_request_selected_regions
  virtio_device_freeze
  virtio_device_restore

# required by virtio_pmem.ko
  nvdimm_bus_register
  nvdimm_bus_unregister
  nvdimm_pmem_region_create

# required by virtio_ring.ko
  alloc_pages_exact
  free_pages_exact
  kimage_voffset

# required by vmw_vsock_virtio_transport_common.ko
  bpf_trace_run10
  bpf_trace_run8
  cancel_delayed_work
  _copy_from_iter_full
  _copy_to_iter
  trace_print_symbols_seq

# required by vsock.ko
  autoremove_wake_function
  __module_get
  module_put
  nonseekable_open
  prandom_u32
  prepare_to_wait
  proto_register
  proto_unregister
  __put_cred
  _raw_write_lock_bh
  _raw_write_unlock_bh
  security_sock_graft