Hi Daniel, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [cannot apply to v5.4-rc3 next-20191011] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Daniel-Colascione/Harden-userfau... reproduce: make htmldocs If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): Warning: The Sphinx 'sphinx_rtd_theme' HTML theme was not found. Make sure you have the theme installed to produce pretty HTML output. Falling back to the default theme. WARNING: dot(1) not found, for better output quality install graphviz from http://www.graphviz.org WARNING: convert(1) not found, for SVG to PDF conversion install ImageMagick (https://www.imagemagick.org) Error: Cannot open file drivers/dma-buf/reservation.c Error: Cannot open file drivers/dma-buf/reservation.c Error: Cannot open file drivers/dma-buf/reservation.c Error: Cannot open file include/linux/reservation.h Error: Cannot open file include/linux/reservation.h include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'quotactl' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'quota_on' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'sb_free_mnt_opts' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'sb_eat_lsm_opts' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'sb_kern_mount' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'sb_show_options' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'sb_add_mnt_opt' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'd_instantiate' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'getprocattr' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'setprocattr' not described in 'security_list_options' include/linux/lsm_hooks.h:1822: warning: Function parameter or member 'locked_down' not described in 'security_list_options' include/linux/regulator/machine.h:196: warning: Function parameter or member 'max_uV_step' not described in 'regulation_constraints' include/linux/regulator/driver.h:223: warning: Function parameter or member 'resume' not described in 'regulator_ops' fs/fs-writeback.c:918: warning: Excess function parameter 'nr_pages' description in 'cgroup_writeback_by_id' fs/direct-io.c:258: warning: Excess function parameter 'offset' description in 'dio_complete' fs/libfs.c:501: warning: Excess function parameter 'available' description in 'simple_write_end' fs/posix_acl.c:647: warning: Function parameter or member 'inode' not described in 'posix_acl_update_mode' fs/posix_acl.c:647: warning: Function parameter or member 'mode_p' not described in 'posix_acl_update_mode' fs/posix_acl.c:647: warning: Function parameter or member 'acl' not described in 'posix_acl_update_mode' include/linux/spi/spi.h:190: warning: Function parameter or member 'driver_override' not described in 'spi_device' drivers/usb/typec/bus.c:1: warning: 'typec_altmode_unregister_driver' not found drivers/usb/typec/bus.c:1: warning: 'typec_altmode_register_driver' not found drivers/usb/typec/class.c:1: warning: 'typec_altmode_register_notifier' not found drivers/usb/typec/class.c:1: warning: 'typec_altmode_unregister_notifier' not found include/linux/w1.h:277: warning: Function parameter or member 'of_match_table' not described in 'w1_family' drivers/gpio/gpiolib-of.c:92: warning: Excess function parameter 'dev' description in 'of_gpio_need_valid_mask' include/linux/i2c.h:337: warning: Function parameter or member 'init_irq' not described in 'i2c_client' kernel/dma/coherent.c:1: warning: no structured comments found include/linux/input/sparse-keymap.h:43: warning: Function parameter or member 'sw' not described in 'key_entry' include/linux/skbuff.h:888: warning: Function parameter or member 'dev_scratch' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'list' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'ip_defrag_offset' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'skb_mstamp_ns' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member '__cloned_offset' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'head_frag' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member '__pkt_type_offset' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'encapsulation' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'encap_hdr_csum' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'csum_valid' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member '__pkt_vlan_present_offset' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'vlan_present' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'csum_complete_sw' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'csum_level' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'inner_protocol_type' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'remcsum_offload' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'sender_cpu' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'reserved_tailroom' not described in 'sk_buff' include/linux/skbuff.h:888: warning: Function parameter or member 'inner_ipproto' not described in 'sk_buff' include/net/sock.h:233: warning: Function parameter or member 'skc_addrpair' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_portpair' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_ipv6only' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_net_refcnt' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_v6_daddr' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_v6_rcv_saddr' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_cookie' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_listener' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_tw_dr' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_rcv_wnd' not described in 'sock_common' include/net/sock.h:233: warning: Function parameter or member 'skc_tw_rcv_nxt' not described in 'sock_common' include/net/sock.h:515: warning: Function parameter or member 'sk_rx_skb_cache' not described in 'sock' include/net/sock.h:515: warning: Function parameter or member 'sk_wq_raw' not described in 'sock' include/net/sock.h:515: warning: Function parameter or member 'tcp_rtx_queue' not described in 'sock' include/net/sock.h:515: warning: Function parameter or member 'sk_tx_skb_cache' not described in 'sock' include/net/sock.h:515: warning: Function parameter or member 'sk_route_forced_caps' not described in 'sock' include/net/sock.h:515: warning: Function parameter or member 'sk_txtime_report_errors' not described in 'sock' include/net/sock.h:515: warning: Function parameter or member 'sk_validate_xmit_skb' not described in 'sock' include/net/sock.h:515: warning: Function parameter or member 'sk_bpf_storage' not described in 'sock' include/net/sock.h:2439: warning: Function parameter or member 'tcp_rx_skb_cache_key' not described in 'DECLARE_STATIC_KEY_FALSE' include/net/sock.h:2439: warning: Excess function parameter 'sk' description in 'DECLARE_STATIC_KEY_FALSE' include/net/sock.h:2439: warning: Excess function parameter 'skb' description in 'DECLARE_STATIC_KEY_FALSE' include/linux/netdevice.h:2053: warning: Function parameter or member 'gso_partial_features' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'l3mdev_ops' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'xfrmdev_ops' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'tlsdev_ops' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'name_assign_type' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'ieee802154_ptr' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'mpls_ptr' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'xdp_prog' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'gro_flush_timeout' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'nf_hooks_ingress' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member '____cacheline_aligned_in_smp' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'qdisc_hash' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'xps_cpus_map' not described in 'net_device' include/linux/netdevice.h:2053: warning: Function parameter or member 'xps_rxqs_map' not described in 'net_device' include/linux/phylink.h:56: warning: Function parameter or member '__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising' not described in 'phylink_link_state' include/linux/phylink.h:56: warning: Function parameter or member '__ETHTOOL_DECLARE_LINK_MODE_MASK(lp_advertising' not described in 'phylink_link_state' drivers/net/phy/phylink.c:595: warning: Function parameter or member 'config' not described in 'phylink_create' drivers/net/phy/phylink.c:595: warning: Excess function parameter 'ndev' description in 'phylink_create' lib/genalloc.c:1: warning: 'gen_pool_add_virt' not found lib/genalloc.c:1: warning: 'gen_pool_alloc' not found lib/genalloc.c:1: warning: 'gen_pool_free' not found lib/genalloc.c:1: warning: 'gen_pool_alloc_algo' not found include/linux/bitmap.h:341: warning: Function parameter or member 'nbits' not described in 'bitmap_or_equal' include/linux/rculist.h:374: warning: Excess function parameter 'cond' description in 'list_for_each_entry_rcu' include/linux/rculist.h:651: warning: Excess function parameter 'cond' description in 'hlist_for_each_entry_rcu' mm/util.c:1: warning: 'get_user_pages_fast' not found mm/slab.c:4215: warning: Function parameter or member 'objp' not described in '__ksize' drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c:335: warning: Excess function parameter 'dev' description in 'amdgpu_gem_prime_export' drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c:336: warning: Excess function parameter 'dev' description in 'amdgpu_gem_prime_export' drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:142: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_read_lock' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:347: warning: cannot understand function prototype: 'struct amdgpu_vm_pt_cursor ' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:348: warning: cannot understand function prototype: 'struct amdgpu_vm_pt_cursor ' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:494: warning: Function parameter or member 'start' not described in 'amdgpu_vm_pt_first_dfs' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:546: warning: Function parameter or member 'adev' not described in 'for_each_amdgpu_vm_pt_dfs_safe' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:546: warning: Function parameter or member 'vm' not described in 'for_each_amdgpu_vm_pt_dfs_safe' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:546: warning: Function parameter or member 'start' not described in 'for_each_amdgpu_vm_pt_dfs_safe' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:546: warning: Function parameter or member 'cursor' not described in 'for_each_amdgpu_vm_pt_dfs_safe' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:546: warning: Function parameter or member 'entry' not described in 'for_each_amdgpu_vm_pt_dfs_safe' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:821: warning: Function parameter or member 'level' not described in 'amdgpu_vm_bo_param' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1283: warning: Function parameter or member 'params' not described in 'amdgpu_vm_update_flags' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1283: warning: Function parameter or member 'bo' not described in 'amdgpu_vm_update_flags' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1283: warning: Function parameter or member 'level' not described in 'amdgpu_vm_update_flags' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1283: warning: Function parameter or member 'pe' not described in 'amdgpu_vm_update_flags' drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1283: warning: Function parameter or member 'addr' not described in 'amdgpu_vm_update_flags' vim +139 fs/anon_inodes.c 562787a5c32ccd Davide Libenzi 2009-09-22 119 562787a5c32ccd Davide Libenzi 2009-09-22 120 /** 428e297f7ee416 Daniel Colascione 2019-10-12 121 * anon_inode_getfd2 - creates a new file instance by hooking it up to an 562787a5c32ccd Davide Libenzi 2009-09-22 122 * anonymous inode, and a dentry that describe the "class" 562787a5c32ccd Davide Libenzi 2009-09-22 123 * of the file 562787a5c32ccd Davide Libenzi 2009-09-22 124 * 562787a5c32ccd Davide Libenzi 2009-09-22 125 * @name: [in] name of the "class" of the new file 562787a5c32ccd Davide Libenzi 2009-09-22 126 * @fops: [in] file operations for the new file 562787a5c32ccd Davide Libenzi 2009-09-22 127 * @priv: [in] private data for the new file (will be file's private_data) 562787a5c32ccd Davide Libenzi 2009-09-22 128 * @flags: [in] flags 562787a5c32ccd Davide Libenzi 2009-09-22 129 * 562787a5c32ccd Davide Libenzi 2009-09-22 130 * Creates a new file by hooking it on a single inode. This is useful for files 562787a5c32ccd Davide Libenzi 2009-09-22 131 * that do not need to have a full-fledged inode in order to operate correctly. 562787a5c32ccd Davide Libenzi 2009-09-22 132 * All the files created with anon_inode_getfd() will share a single inode, 562787a5c32ccd Davide Libenzi 2009-09-22 133 * hence saving memory and avoiding code duplication for the file/inode/dentry 562787a5c32ccd Davide Libenzi 2009-09-22 134 * setup. Returns new descriptor or an error code. 562787a5c32ccd Davide Libenzi 2009-09-22 135 */ 428e297f7ee416 Daniel Colascione 2019-10-12 136 int anon_inode_getfd2(const char *name, const struct file_operations *fops, 428e297f7ee416 Daniel Colascione 2019-10-12 137 void *priv, int flags, int anon_inode_flags) 562787a5c32ccd Davide Libenzi 2009-09-22 138 { 562787a5c32ccd Davide Libenzi 2009-09-22 @139 int error, fd; 562787a5c32ccd Davide Libenzi 2009-09-22 140 struct file *file; 562787a5c32ccd Davide Libenzi 2009-09-22 141 562787a5c32ccd Davide Libenzi 2009-09-22 142 error = get_unused_fd_flags(flags); 562787a5c32ccd Davide Libenzi 2009-09-22 143 if (error < 0) 562787a5c32ccd Davide Libenzi 2009-09-22 144 return error; 562787a5c32ccd Davide Libenzi 2009-09-22 145 fd = error; 562787a5c32ccd Davide Libenzi 2009-09-22 146 428e297f7ee416 Daniel Colascione 2019-10-12 147 file = anon_inode_getfile2(name, fops, priv, flags, anon_inode_flags); 562787a5c32ccd Davide Libenzi 2009-09-22 148 if (IS_ERR(file)) { 562787a5c32ccd Davide Libenzi 2009-09-22 149 error = PTR_ERR(file); 562787a5c32ccd Davide Libenzi 2009-09-22 150 goto err_put_unused_fd; 562787a5c32ccd Davide Libenzi 2009-09-22 151 } 5dc8bf8132d59c Davide Libenzi 2007-05-10 152 fd_install(fd, file); 5dc8bf8132d59c Davide Libenzi 2007-05-10 153 2030a42cecd4dd Al Viro 2008-02-23 154 return fd; 5dc8bf8132d59c Davide Libenzi 2007-05-10 155 5dc8bf8132d59c Davide Libenzi 2007-05-10 156 err_put_unused_fd: 5dc8bf8132d59c Davide Libenzi 2007-05-10 157 put_unused_fd(fd); 5dc8bf8132d59c Davide Libenzi 2007-05-10 158 return error; 5dc8bf8132d59c Davide Libenzi 2007-05-10 159 } d6d281684913da Avi Kivity 2007-06-28 160 EXPORT_SYMBOL_GPL(anon_inode_getfd); 428e297f7ee416 Daniel Colascione 2019-10-12 161 EXPORT_SYMBOL_GPL(anon_inode_getfd2); 5dc8bf8132d59c Davide Libenzi 2007-05-10 162 :::::: The code at line 139 was first introduced by commit :::::: 562787a5c32ccdf182de27793a83a9f2ee86cd77 anonfd: split interface into file creation and install :::::: TO: Davide Libenzi <davidel(a)xmailserver.org&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation