如何用VSCode和Clangd与Clang-Format插件高效阅读Linux内核源码及写驱动

news2024/11/18 17:42:35

一、如何高效阅读Linux源码：基于clangd

uboot/busybox等都可以用这种方式，理论上说所有基于Make和Cmake的源码工程都可以用这套方案

阅读Linux源码最大问题在于调用链太复杂，一个函数或变量引用太多，source insight和cscope等基于文本检索类似的工具，分析都不够精确，clangd是在编译过程分析调用关系，结果要准确地多，使用效果极佳。下面截取几个图展示下clangd的强大之处

Kconfig和Makefile中定义的配置项宏如果为0，Clangd检索完VScode会把没走到的分支自动注释掉，大大降低我们分析源码时走错分支的可能性

请添加图片描述

右键ShowCallHierarchy调用栈分析一步到位

请添加图片描述

精准强大的代码补全

在写驱动时，对内核方法和对象的提示非常全和准确
请添加图片描述

创建索引非常快，5.10.99的内核全量创建索引只需约2分钟，busybox和uboot的源码十几秒就好了

创建索引非常快，5.10.99的内核全量创建索引只需约2分钟，busybox和uboot的源码十几秒就好了

搭建教程参考

https://blog.csdn.net/thisway_diy/article/details/127426986

二、写驱动时如何自动格式化并(最好和Linux内核源码一个风格！！！）

1.VScode安装Clang-Format插件

左侧插件市场搜索直接安装即可

2.给系统安装clang-format

以Ubuntu为例，其他系统类似

sudo apt-get install clang-format

3.从Linux源码根目录把.clang-format文件拷贝到自己的项目目录

5.10.99亲测官方源码就有.clang-format文件，不过4.x版本没有，应该是5.x引进的，方便内核开发人员统一编码风格的

防止的Linux内核源码版本低，这里拷贝一份过来，大家可以在自己的工程目录手动创建.clang-format文件，并把下面的内容复制进去

# SPDX-License-Identifier: GPL-2.0
#
# clang-format configuration file. Intended for clang-format >= 4.
#
# For more information, see:
#
#   Documentation/process/clang-format.rst
#   https://clang.llvm.org/docs/ClangFormat.html
#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
#
---
AccessModifierOffset: -4
AlignAfterOpenBracket: Align
AlignConsecutiveAssignments: false
AlignConsecutiveDeclarations: false
#AlignEscapedNewlines: Left # Unknown to clang-format-4.0
AlignOperands: true
AlignTrailingComments: false
AllowAllParametersOfDeclarationOnNextLine: false
AllowShortBlocksOnASingleLine: false
AllowShortCaseLabelsOnASingleLine: false
AllowShortFunctionsOnASingleLine: None
AllowShortIfStatementsOnASingleLine: false
AllowShortLoopsOnASingleLine: false
AlwaysBreakAfterDefinitionReturnType: None
AlwaysBreakAfterReturnType: None
AlwaysBreakBeforeMultilineStrings: false
AlwaysBreakTemplateDeclarations: false
BinPackArguments: true
BinPackParameters: true
BraceWrapping:
  AfterClass: false
  AfterControlStatement: false
  AfterEnum: false
  AfterFunction: true
  AfterNamespace: true
  AfterObjCDeclaration: false
  AfterStruct: false
  AfterUnion: false
  #AfterExternBlock: false # Unknown to clang-format-5.0
  BeforeCatch: false
  BeforeElse: false
  IndentBraces: false
  #SplitEmptyFunction: true # Unknown to clang-format-4.0
  #SplitEmptyRecord: true # Unknown to clang-format-4.0
  #SplitEmptyNamespace: true # Unknown to clang-format-4.0
BreakBeforeBinaryOperators: None
BreakBeforeBraces: Custom
#BreakBeforeInheritanceComma: false # Unknown to clang-format-4.0
BreakBeforeTernaryOperators: false
BreakConstructorInitializersBeforeComma: false
#BreakConstructorInitializers: BeforeComma # Unknown to clang-format-4.0
BreakAfterJavaFieldAnnotations: false
BreakStringLiterals: false
ColumnLimit: 80
CommentPragmas: '^ IWYU pragma:'
#CompactNamespaces: false # Unknown to clang-format-4.0
ConstructorInitializerAllOnOneLineOrOnePerLine: false
ConstructorInitializerIndentWidth: 8
ContinuationIndentWidth: 8
Cpp11BracedListStyle: false
DerivePointerAlignment: false
DisableFormat: false
ExperimentalAutoDetectBinPacking: false
#FixNamespaceComments: false # Unknown to clang-format-4.0

# Taken from:
#   git grep -h '^#define [^[:space:]]*for_each[^[:space:]]*(' include/ \
#   | sed "s,^#define \([^[:space:]]*for_each[^[:space:]]*\)(.*$,  - '\1'," \
#   | sort | uniq
ForEachMacros:
  - '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_bvec'
  - 'bio_for_each_bvec'
  - 'bio_for_each_bvec_all'
  - 'bio_for_each_integrity_vec'
  - '__bio_for_each_segment'
  - 'bio_for_each_segment'
  - 'bio_for_each_segment_all'
  - 'bio_list_for_each'
  - 'bip_for_each_vec'
  - 'bitmap_for_each_clear_region'
  - 'bitmap_for_each_set_region'
  - 'blkg_for_each_descendant_post'
  - 'blkg_for_each_descendant_pre'
  - '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'
  - 'btree_for_each_safel'
  - 'card_for_each_dev'
  - 'cgroup_taskset_for_each'
  - 'cgroup_taskset_for_each_leader'
  - 'cpufreq_for_each_entry'
  - 'cpufreq_for_each_entry_idx'
  - 'cpufreq_for_each_valid_entry'
  - 'cpufreq_for_each_valid_entry_idx'
  - 'css_for_each_child'
  - 'css_for_each_descendant_post'
  - 'css_for_each_descendant_pre'
  - 'device_for_each_child_node'
  - 'dma_fence_chain_for_each'
  - 'do_for_each_ftrace_op'
  - '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_client_for_each_connector_iter'
  - 'drm_client_for_each_modeset'
  - 'drm_connector_for_each_possible_encoder'
  - 'drm_for_each_bridge_in_chain'
  - 'drm_for_each_connector_iter'
  - 'drm_for_each_crtc'
  - 'drm_for_each_encoder'
  - 'drm_for_each_encoder_mask'
  - 'drm_for_each_fb'
  - 'drm_for_each_legacy_plane'
  - 'drm_for_each_plane'
  - 'drm_for_each_plane_mask'
  - 'drm_for_each_privobj'
  - 'drm_mm_for_each_hole'
  - 'drm_mm_for_each_node'
  - 'drm_mm_for_each_node_in_range'
  - 'drm_mm_for_each_node_safe'
  - 'flow_action_for_each'
  - 'for_each_active_dev_scope'
  - 'for_each_active_drhd_unit'
  - 'for_each_active_iommu'
  - 'for_each_aggr_pgid'
  - 'for_each_available_child_of_node'
  - 'for_each_bio'
  - 'for_each_board_func_rsrc'
  - 'for_each_bvec'
  - 'for_each_card_auxs'
  - 'for_each_card_auxs_safe'
  - 'for_each_card_components'
  - 'for_each_card_dapms'
  - 'for_each_card_pre_auxs'
  - 'for_each_card_prelinks'
  - 'for_each_card_rtds'
  - 'for_each_card_rtds_safe'
  - 'for_each_card_widgets'
  - 'for_each_card_widgets_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_not'
  - 'for_each_cpu_wrap'
  - 'for_each_dapm_widgets'
  - 'for_each_dev_addr'
  - 'for_each_dev_scope'
  - 'for_each_displayid_db'
  - '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_efi_memory_desc_in_map'
  - 'for_each_element'
  - 'for_each_element_extid'
  - 'for_each_element_id'
  - 'for_each_endpoint_of_node'
  - 'for_each_evictable_lru'
  - 'for_each_fib6_node_rt_rcu'
  - 'for_each_fib6_walker_rt'
  - 'for_each_free_mem_pfn_range_in_zone'
  - 'for_each_free_mem_pfn_range_in_zone_from'
  - 'for_each_free_mem_range'
  - 'for_each_free_mem_range_reverse'
  - 'for_each_func_rsrc'
  - 'for_each_hstate'
  - 'for_each_if'
  - 'for_each_iommu'
  - 'for_each_ip_tunnel_rcu'
  - 'for_each_irq_nr'
  - 'for_each_link_codecs'
  - 'for_each_link_cpus'
  - 'for_each_link_platforms'
  - 'for_each_lru'
  - 'for_each_matching_node'
  - 'for_each_matching_node_and_match'
  - 'for_each_member'
  - 'for_each_mem_region'
  - 'for_each_memblock_type'
  - 'for_each_memcg_cache_index'
  - 'for_each_mem_pfn_range'
  - '__for_each_mem_range'
  - 'for_each_mem_range'
  - '__for_each_mem_range_rev'
  - 'for_each_mem_range_rev'
  - 'for_each_migratetype_order'
  - 'for_each_msi_entry'
  - 'for_each_msi_entry_safe'
  - 'for_each_net'
  - 'for_each_net_continue_reverse'
  - 'for_each_netdev'
  - 'for_each_netdev_continue'
  - 'for_each_netdev_continue_rcu'
  - 'for_each_netdev_continue_reverse'
  - 'for_each_netdev_feature'
  - 'for_each_netdev_in_bond_rcu'
  - 'for_each_netdev_rcu'
  - 'for_each_netdev_reverse'
  - 'for_each_netdev_safe'
  - 'for_each_net_rcu'
  - 'for_each_new_connector_in_state'
  - 'for_each_new_crtc_in_state'
  - 'for_each_new_mst_mgr_in_state'
  - 'for_each_new_plane_in_state'
  - 'for_each_new_private_obj_in_state'
  - 'for_each_node'
  - 'for_each_node_by_name'
  - 'for_each_node_by_type'
  - 'for_each_node_mask'
  - 'for_each_node_state'
  - 'for_each_node_with_cpus'
  - 'for_each_node_with_property'
  - 'for_each_nonreserved_multicast_dest_pgid'
  - '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_old_mst_mgr_in_state'
  - 'for_each_oldnew_connector_in_state'
  - 'for_each_oldnew_crtc_in_state'
  - 'for_each_oldnew_mst_mgr_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_online_cpu'
  - 'for_each_online_node'
  - 'for_each_online_pgdat'
  - 'for_each_pci_bridge'
  - 'for_each_pci_dev'
  - 'for_each_pci_msi_entry'
  - 'for_each_pcm_streams'
  - 'for_each_physmem_range'
  - 'for_each_populated_zone'
  - 'for_each_possible_cpu'
  - 'for_each_present_cpu'
  - 'for_each_prime_number'
  - 'for_each_prime_number_from'
  - 'for_each_process'
  - 'for_each_process_thread'
  - 'for_each_property_of_node'
  - 'for_each_registered_fb'
  - 'for_each_requested_gpio'
  - 'for_each_requested_gpio_in_range'
  - 'for_each_reserved_mem_range'
  - 'for_each_reserved_mem_region'
  - 'for_each_rtd_codec_dais'
  - 'for_each_rtd_codec_dais_rollback'
  - 'for_each_rtd_components'
  - 'for_each_rtd_cpu_dais'
  - 'for_each_rtd_cpu_dais_rollback'
  - 'for_each_rtd_dais'
  - 'for_each_set_bit'
  - 'for_each_set_bit_from'
  - 'for_each_set_clump8'
  - 'for_each_sg'
  - 'for_each_sg_dma_page'
  - 'for_each_sg_page'
  - 'for_each_sgtable_dma_page'
  - 'for_each_sgtable_dma_sg'
  - 'for_each_sgtable_page'
  - 'for_each_sgtable_sg'
  - 'for_each_sibling_event'
  - 'for_each_subelement'
  - 'for_each_subelement_extid'
  - 'for_each_subelement_id'
  - '__for_each_thread'
  - 'for_each_thread'
  - 'for_each_unicast_dest_pgid'
  - 'for_each_wakeup_source'
  - 'for_each_zone'
  - 'for_each_zone_zonelist'
  - 'for_each_zone_zonelist_nodemask'
  - 'fwnode_for_each_available_child_node'
  - 'fwnode_for_each_child_node'
  - 'fwnode_graph_for_each_endpoint'
  - 'gadget_for_each_ep'
  - 'genradix_for_each'
  - 'genradix_for_each_from'
  - 'hash_for_each'
  - 'hash_for_each_possible'
  - 'hash_for_each_possible_rcu'
  - 'hash_for_each_possible_rcu_notrace'
  - 'hash_for_each_possible_safe'
  - 'hash_for_each_rcu'
  - 'hash_for_each_safe'
  - 'hctx_for_each_ctx'
  - 'hlist_bl_for_each_entry'
  - 'hlist_bl_for_each_entry_rcu'
  - 'hlist_bl_for_each_entry_safe'
  - 'hlist_for_each'
  - 'hlist_for_each_entry'
  - 'hlist_for_each_entry_continue'
  - 'hlist_for_each_entry_continue_rcu'
  - 'hlist_for_each_entry_continue_rcu_bh'
  - 'hlist_for_each_entry_from'
  - 'hlist_for_each_entry_from_rcu'
  - 'hlist_for_each_entry_rcu'
  - 'hlist_for_each_entry_rcu_bh'
  - 'hlist_for_each_entry_rcu_notrace'
  - 'hlist_for_each_entry_safe'
  - '__hlist_for_each_rcu'
  - 'hlist_for_each_safe'
  - 'hlist_nulls_for_each_entry'
  - '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'
  - 'idr_for_each_entry'
  - 'idr_for_each_entry_continue'
  - 'idr_for_each_entry_continue_ul'
  - 'idr_for_each_entry_ul'
  - 'in_dev_for_each_ifa_rcu'
  - 'in_dev_for_each_ifa_rtnl'
  - 'inet_bind_bucket_for_each'
  - 'inet_lhash2_for_each_icsk_rcu'
  - 'key_for_each'
  - 'key_for_each_safe'
  - 'klp_for_each_func'
  - 'klp_for_each_func_safe'
  - 'klp_for_each_func_static'
  - 'klp_for_each_object'
  - 'klp_for_each_object_safe'
  - 'klp_for_each_object_static'
  - 'kunit_suite_for_each_test_case'
  - 'kvm_for_each_memslot'
  - 'kvm_for_each_vcpu'
  - 'list_for_each'
  - 'list_for_each_codec'
  - 'list_for_each_codec_safe'
  - 'list_for_each_continue'
  - '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'
  - 'list_for_each_entry_reverse'
  - 'list_for_each_entry_safe'
  - 'list_for_each_entry_safe_continue'
  - 'list_for_each_entry_safe_from'
  - 'list_for_each_entry_safe_reverse'
  - 'list_for_each_prev'
  - 'list_for_each_prev_safe'
  - 'list_for_each_safe'
  - 'llist_for_each'
  - 'llist_for_each_entry'
  - 'llist_for_each_entry_safe'
  - 'llist_for_each_safe'
  - 'mci_for_each_dimm'
  - 'media_device_for_each_entity'
  - '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'
  - 'netdev_for_each_mc_addr'
  - 'netdev_for_each_uc_addr'
  - 'netdev_for_each_upper_dev_rcu'
  - 'netdev_hw_addr_list_for_each'
  - 'nft_rule_for_each_expr'
  - 'nla_for_each_attr'
  - 'nla_for_each_nested'
  - 'nlmsg_for_each_attr'
  - 'nlmsg_for_each_msg'
  - 'nr_neigh_for_each'
  - 'nr_neigh_for_each_safe'
  - 'nr_node_for_each'
  - 'nr_node_for_each_safe'
  - 'of_for_each_phandle'
  - 'of_property_for_each_string'
  - 'of_property_for_each_u32'
  - 'pci_bus_for_each_resource'
  - 'pcm_for_each_format'
  - 'ping_portaddr_for_each_entry'
  - 'plist_for_each'
  - 'plist_for_each_continue'
  - 'plist_for_each_entry'
  - 'plist_for_each_entry_continue'
  - 'plist_for_each_entry_safe'
  - 'plist_for_each_safe'
  - 'pnp_for_each_card'
  - 'pnp_for_each_dev'
  - 'protocol_for_each_card'
  - 'protocol_for_each_dev'
  - 'queue_for_each_hw_ctx'
  - 'radix_tree_for_each_slot'
  - 'radix_tree_for_each_tagged'
  - 'rbtree_postorder_for_each_entry_safe'
  - 'rdma_for_each_block'
  - 'rdma_for_each_port'
  - 'rdma_umem_for_each_dma_block'
  - 'resource_list_for_each_entry'
  - 'resource_list_for_each_entry_safe'
  - 'rhl_for_each_entry_rcu'
  - 'rhl_for_each_rcu'
  - 'rht_for_each'
  - 'rht_for_each_entry'
  - 'rht_for_each_entry_from'
  - 'rht_for_each_entry_rcu'
  - 'rht_for_each_entry_rcu_from'
  - 'rht_for_each_entry_safe'
  - 'rht_for_each_from'
  - 'rht_for_each_rcu'
  - 'rht_for_each_rcu_from'
  - '__rq_for_each_bio'
  - 'rq_for_each_bvec'
  - 'rq_for_each_segment'
  - 'scsi_for_each_prot_sg'
  - 'scsi_for_each_sg'
  - 'sctp_for_each_hentry'
  - 'sctp_skb_for_each'
  - 'shdma_for_each_chan'
  - '__shost_for_each_device'
  - 'shost_for_each_device'
  - 'sk_for_each'
  - 'sk_for_each_bound'
  - 'sk_for_each_entry_offset_rcu'
  - 'sk_for_each_from'
  - 'sk_for_each_rcu'
  - 'sk_for_each_safe'
  - '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_device_for_each_subdev'
  - 'v4l2_m2m_for_each_dst_buf'
  - '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'
  - 'while_for_each_ftrace_op'
  - 'xa_for_each'
  - 'xa_for_each_marked'
  - 'xa_for_each_range'
  - 'xa_for_each_start'
  - 'xas_for_each'
  - 'xas_for_each_conflict'
  - 'xas_for_each_marked'
  - 'xbc_array_for_each_value'
  - 'xbc_for_each_key_value'
  - 'xbc_node_for_each_array_value'
  - 'xbc_node_for_each_child'
  - 'xbc_node_for_each_key_value'
  - 'zorro_for_each_dev'

#IncludeBlocks: Preserve # Unknown to clang-format-5.0
IncludeCategories:
  - Regex: '.*'
    Priority: 1
IncludeIsMainRegex: '(Test)?$'
IndentCaseLabels: false
#IndentPPDirectives: None # Unknown to clang-format-5.0
IndentWidth: 8
IndentWrappedFunctionNames: false
JavaScriptQuotes: Leave
JavaScriptWrapImports: true
KeepEmptyLinesAtTheStartOfBlocks: false
MacroBlockBegin: ''
MacroBlockEnd: ''
MaxEmptyLinesToKeep: 1
NamespaceIndentation: None
#ObjCBinPackProtocolList: Auto # Unknown to clang-format-5.0
ObjCBlockIndentWidth: 8
ObjCSpaceAfterProperty: true
ObjCSpaceBeforeProtocolList: true

# Taken from git's rules
#PenaltyBreakAssignment: 10 # Unknown to clang-format-4.0
PenaltyBreakBeforeFirstCallParameter: 30
PenaltyBreakComment: 10
PenaltyBreakFirstLessLess: 0
PenaltyBreakString: 10
PenaltyExcessCharacter: 100
PenaltyReturnTypeOnItsOwnLine: 60

PointerAlignment: Right
ReflowComments: false
SortIncludes: false
#SortUsingDeclarations: false # Unknown to clang-format-4.0
SpaceAfterCStyleCast: false
SpaceAfterTemplateKeyword: true
SpaceBeforeAssignmentOperators: true
#SpaceBeforeCtorInitializerColon: true # Unknown to clang-format-5.0
#SpaceBeforeInheritanceColon: true # Unknown to clang-format-5.0
SpaceBeforeParens: ControlStatements
#SpaceBeforeRangeBasedForLoopColon: true # Unknown to clang-format-5.0
SpaceInEmptyParentheses: false
SpacesBeforeTrailingComments: 1
SpacesInAngles: false
SpacesInContainerLiterals: false
SpacesInCStyleCastParentheses: false
SpacesInParentheses: false
SpacesInSquareBrackets: false
Standard: Cpp03
TabWidth: 8
UseTab: Always
...

4.设置clang-format为默认格式化插件

操作如下
请添加图片描述

5.设置格式化时机为format on save

请添加图片描述

6.打开自己的代码文件，随便修改点，按Ctrl+S保存，代码即可自动格式化，而且和内核风格完全一样

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