Hi Eric,

FYI, kernel build failed on

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git userns-always-map-user-v44
head:   6558c48b60a8ae06e86ad4193a8cc0cc56b3b32d
commit: 6558c48b60a8ae06e86ad4193a8cc0cc56b3b32d [99/99] proc: Usable inode numbers for the namespace file descriptors.
config: x86_64-lkp (attached as .config)

vim +82 kernel/pid.c
    79		.level = 0,
    80		.child_reaper = &init_task,
    81		.user_ns = &init_user_ns,
  > 82		.proc_inum = PROC_PID_INIT_INO,
    83	};
    84	EXPORT_SYMBOL_GPL(init_pid_ns);
    85	

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0-DAY kernel build testing backend         Open Source Technology Centre
Fengguang Wu <wfg@linux.intel.com>                     Intel Corporation