Merge 5.0-rc4 into tty-next

  - 'apei_estatus_for_each_section'

  - 'ata_for_each_dev'

  - 'ata_for_each_link'

  - '__ata_qc_for_each'

  - 'ata_qc_for_each'

  - 'ata_qc_for_each_raw'

  - 'ata_qc_for_each_with_internal'

  - 'ax25_for_each'

  - 'ax25_uid_for_each'

  - 'bio_for_each_integrity_vec'

  - 'blk_queue_for_each_rl'

  - 'bond_for_each_slave'

  - 'bond_for_each_slave_rcu'

  - 'bpf_for_each_spilled_reg'

  - 'btree_for_each_safe128'

  - 'btree_for_each_safe32'

  - 'btree_for_each_safe64'

  - 'drm_atomic_crtc_for_each_plane'

  - 'drm_atomic_crtc_state_for_each_plane'

  - 'drm_atomic_crtc_state_for_each_plane_state'

  - 'drm_atomic_for_each_plane_damage'

  - 'drm_connector_for_each_possible_encoder'

  - 'drm_for_each_connector_iter'

  - 'drm_for_each_crtc'

  - 'drm_for_each_encoder'

  - 'for_each_bio'

  - 'for_each_board_func_rsrc'

  - 'for_each_bvec'

  - 'for_each_card_components'

  - 'for_each_card_links'

  - 'for_each_card_links_safe'

  - 'for_each_card_prelinks'

  - 'for_each_card_rtds'

  - 'for_each_card_rtds_safe'

  - 'for_each_cgroup_storage_type'

  - 'for_each_child_of_node'

  - 'for_each_clear_bit'

  - 'for_each_clear_bit_from'

  - 'for_each_cmsghdr'

  - 'for_each_compatible_node'

  - 'for_each_component_dais'

  - 'for_each_component_dais_safe'

  - 'for_each_comp_order'

  - 'for_each_console'

  - 'for_each_cpu'

  - 'for_each_cpu_and'

  - 'for_each_cpu_wrap'

  - 'for_each_dev_addr'

  - 'for_each_dma_cap_mask'

  - 'for_each_dpcm_be'

  - 'for_each_dpcm_be_rollback'

  - 'for_each_dpcm_be_safe'

  - 'for_each_dpcm_fe'

  - 'for_each_drhd_unit'

  - 'for_each_dss_dev'

  - 'for_each_efi_memory_desc'

  - 'for_each_iommu'

  - 'for_each_ip_tunnel_rcu'

  - 'for_each_irq_nr'

  - 'for_each_link_codecs'

  - 'for_each_lru'

  - 'for_each_matching_node'

  - 'for_each_matching_node_and_match'

  - 'for_each_mem_range_rev'

  - 'for_each_migratetype_order'

  - 'for_each_msi_entry'

  - 'for_each_msi_entry_safe'

  - 'for_each_net'

  - 'for_each_netdev'

  - 'for_each_netdev_continue'

  - 'for_each_node_with_property'

  - 'for_each_of_allnodes'

  - 'for_each_of_allnodes_from'

  - 'for_each_of_cpu_node'

  - 'for_each_of_pci_range'

  - 'for_each_old_connector_in_state'

  - 'for_each_old_crtc_in_state'

  - 'for_each_oldnew_connector_in_state'

  - 'for_each_oldnew_crtc_in_state'

  - 'for_each_oldnew_plane_in_state'

  - 'for_each_oldnew_plane_in_state_reverse'

  - 'for_each_oldnew_private_obj_in_state'

  - 'for_each_old_plane_in_state'

  - 'for_each_old_private_obj_in_state'

  - 'for_each_process'

  - 'for_each_process_thread'

  - 'for_each_property_of_node'

  - 'for_each_registered_fb'

  - 'for_each_reserved_mem_region'

  - 'for_each_resv_unavail_range'

  - 'for_each_rtd_codec_dai'

  - 'for_each_rtd_codec_dai_rollback'

  - 'for_each_rtdcom'

  - 'for_each_rtdcom_safe'

  - 'for_each_set_bit'

  - 'for_each_set_bit_from'

  - 'for_each_sg'

  - 'for_each_sg_page'

  - 'for_each_sibling_event'

  - '__for_each_thread'

  - 'for_each_thread'

  - 'for_each_zone'

  - 'hlist_nulls_for_each_entry_from'

  - 'hlist_nulls_for_each_entry_rcu'

  - 'hlist_nulls_for_each_entry_safe'

  - 'i3c_bus_for_each_i2cdev'

  - 'i3c_bus_for_each_i3cdev'

  - 'ide_host_for_each_port'

  - 'ide_port_for_each_dev'

  - 'ide_port_for_each_present_dev'

  - 'kvm_for_each_memslot'

  - 'kvm_for_each_vcpu'

  - 'list_for_each'

  - 'list_for_each_codec'

  - 'list_for_each_codec_safe'

  - 'list_for_each_entry'

  - 'list_for_each_entry_continue'

  - 'list_for_each_entry_continue_rcu'

  - 'list_for_each_entry_continue_reverse'

  - 'list_for_each_entry_from'

  - 'list_for_each_entry_from_rcu'

  - 'list_for_each_entry_from_reverse'

  - 'list_for_each_entry_lockless'

  - 'list_for_each_entry_rcu'

  - 'media_device_for_each_intf'

  - 'media_device_for_each_link'

  - 'media_device_for_each_pad'

  - 'nanddev_io_for_each_page'

  - 'netdev_for_each_lower_dev'

  - 'netdev_for_each_lower_private'

  - 'netdev_for_each_lower_private_rcu'

  - 'sk_nulls_for_each'

  - 'sk_nulls_for_each_from'

  - 'sk_nulls_for_each_rcu'

  - 'snd_array_for_each'

  - 'snd_pcm_group_for_each_entry'

  - 'snd_soc_dapm_widget_for_each_path'

  - 'snd_soc_dapm_widget_for_each_path_safe'

  - 'snd_soc_dapm_widget_for_each_sink_path'

  - 'snd_soc_dapm_widget_for_each_source_path'

  - 'tb_property_for_each'

  - 'tcf_exts_for_each_action'

  - 'udp_portaddr_for_each_entry'

  - 'udp_portaddr_for_each_entry_rcu'

  - 'usb_hub_for_each_child'

  - 'v4l2_m2m_for_each_dst_buf_safe'

  - 'v4l2_m2m_for_each_src_buf'

  - 'v4l2_m2m_for_each_src_buf_safe'

  - 'virtio_device_for_each_vq'

  - 'xa_for_each'

  - 'xas_for_each'

  - 'xas_for_each_conflict'

  - 'xas_for_each_marked'

  - 'zorro_for_each_dev'

#IncludeBlocks: Preserve # Unknown to clang-format-5.0

------------------------------

A: YES. BPF instructions, arguments to BPF programs, set of helper

functions and their arguments, recognized return codes are all part

of ABI. However when tracing programs are using bpf_probe_read() helper

to walk kernel internal datastructures and compile with kernel

internal headers these accesses can and will break with newer

kernels. The union bpf_attr -> kern_version is checked at load time

to prevent accidentally loading kprobe-based bpf programs written

for a different kernel. Networking programs don't do kern_version check.

of ABI. However there is one specific exception to tracing programs

which are using helpers like bpf_probe_read() to walk kernel internal

data structures and compile with kernel internal headers. Both of these

kernel internals are subject to change and can break with newer kernels

such that the program needs to be adapted accordingly.

Q: How much stack space a BPF program uses?

-------------------------------------------

Sometimes you need to ensure that a subsequent call to :c:func:`xa_store`

will not need to allocate memory.  The :c:func:`xa_reserve` function

will store a reserved entry at the indicated index.  Users of the normal

API will see this entry as containing ``NULL``.  If you do not need to

use the reserved entry, you can call :c:func:`xa_release` to remove the

unused entry.  If another user has stored to the entry in the meantime,

:c:func:`xa_release` will do nothing; if instead you want the entry to

become ``NULL``, you should use :c:func:`xa_erase`.

will store a reserved entry at the indicated index.  Users of the

normal API will see this entry as containing ``NULL``.  If you do

not need to use the reserved entry, you can call :c:func:`xa_release`

to remove the unused entry.  If another user has stored to the entry

in the meantime, :c:func:`xa_release` will do nothing; if instead you

want the entry to become ``NULL``, you should use :c:func:`xa_erase`.

Using :c:func:`xa_insert` on a reserved entry will fail.

If all entries in the array are ``NULL``, the :c:func:`xa_empty` function

will return ``true``.

 * :c:func:`xa_store_bh`

 * :c:func:`xa_store_irq`

 * :c:func:`xa_insert`

 * :c:func:`xa_insert_bh`

 * :c:func:`xa_insert_irq`

 * :c:func:`xa_erase`

 * :c:func:`xa_erase_bh`

 * :c:func:`xa_erase_irq`

===========================================

[1] ARM Linux Kernel documentation - CPUs bindings

    Documentation/devicetree/bindings/arm/cpus.txt

    Documentation/devicetree/bindings/arm/cpus.yaml

===========================================

[1] ARM Linux Kernel documentation - CPUs bindings

    Documentation/devicetree/bindings/arm/cpus.txt

    Documentation/devicetree/bindings/arm/cpus.yaml

[2] ARM Linux Kernel documentation - PSCI bindings

    Documentation/devicetree/bindings/arm/psci.txt