[jarkko-tpmdd:container 10/14] fs/proc/root.c:340:41: error: incomplete definition of type 'struct container'

[jarkko-tpmdd:container 10/14] fs/proc/root.c:340:41: error: incomplete definition of type 'struct container'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git container
head:   ac4ec62cd4decf787406c1407f18ade110d80c5a
commit: eae87346ef7094984596a12c9096148d3989c983 [10/14] containers: Make fsopen() able to create a superblock in a container
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20260211/202602111518.6xepFJ52-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/20260211/202602111518.6xepFJ52-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602111518.6xepFJ52-lkp@intel.com/

All errors (new ones prefixed by >>):

>> fs/proc/root.c:340:41: error: incomplete definition of type 'struct container'
     340 |                 ctx->pid_ns = get_pid_ns(fc->container->pid_ns);
         |                                          ~~~~~~~~~~~~~^
   include/linux/sched.h:65:8: note: forward declaration of 'struct container'
      65 | struct container;
         |        ^
   1 error generated.


vim +340 fs/proc/root.c

   330	
   331	static int proc_init_fs_context(struct fs_context *fc)
   332	{
   333		struct proc_fs_context *ctx;
   334	
   335		ctx = kzalloc(sizeof(struct proc_fs_context), GFP_KERNEL);
   336		if (!ctx)
   337			return -ENOMEM;
   338	
   339		if (fc->container)
 > 340			ctx->pid_ns = get_pid_ns(fc->container->pid_ns);
   341		else
   342			ctx->pid_ns = get_pid_ns(task_active_pid_ns(current));
   343	
   344		put_user_ns(fc->user_ns);
   345		fc->user_ns = get_user_ns(ctx->pid_ns->user_ns);
   346		fc->fs_private = ctx;
   347		fc->ops = &proc_fs_context_ops;
   348		return 0;
   349	}
   350	

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