linux-kernel - Re: [PATCH] bpf: use FS_USERNS

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Message-ID: <202602060128.qfggT7Pd-lkp@intel.com>
Date: Fri, 6 Feb 2026 01:58:31 +0800
From: kernel test robot <lkp@...el.com>
To: Alexander Mikhalitsyn <alexander@...alicyn.com>, ast@...nel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Jeff Layton <jlayton@...nel.org>,
	Christian Brauner <brauner@...nel.org>, bpf@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...urfusion.io>
Subject: Re: [PATCH] bpf: use FS_USERNS_DELEGATABLE for bpffs

Hi Alexander,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf-next/net]
[also build test ERROR on bpf-next/master bpf/master brauner-vfs/vfs.all linus/master v6.19-rc8 next-20260205]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexander-Mikhalitsyn/bpf-use-FS_USERNS_DELEGATABLE-for-bpffs/20260205-184845
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git net
patch link:    https://lore.kernel.org/r/20260205104541.171034-1-alexander%40mihalicyn.com
patch subject: [PATCH] bpf: use FS_USERNS_DELEGATABLE for bpffs
config: i386-buildonly-randconfig-002-20260205 (https://download.01.org/0day-ci/archive/20260206/202602060128.qfggT7Pd-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260206/202602060128.qfggT7Pd-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602060128.qfggT7Pd-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/bpf/inode.c:1084:14: error: use of undeclared identifier 'FS_USERNS_DELEGATABLE'; did you mean 'CFTYPE_NS_DELEGATABLE'?
    1084 |         .fs_flags       = FS_USERNS_DELEGATABLE,
         |                           ^~~~~~~~~~~~~~~~~~~~~
         |                           CFTYPE_NS_DELEGATABLE
   include/linux/cgroup-defs.h:137:2: note: 'CFTYPE_NS_DELEGATABLE' declared here
     137 |         CFTYPE_NS_DELEGATABLE   = (1 << 2),     /* writeable beyond delegation boundaries */
         |         ^
   1 error generated.


vim +1084 kernel/bpf/inode.c

  1077	
  1078	static struct file_system_type bpf_fs_type = {
  1079		.owner		= THIS_MODULE,
  1080		.name		= "bpf",
  1081		.init_fs_context = bpf_init_fs_context,
  1082		.parameters	= bpf_fs_parameters,
  1083		.kill_sb	= bpf_kill_super,
> 1084		.fs_flags	= FS_USERNS_DELEGATABLE,
  1085	};
  1086	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki