Hi Waiman,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc1 next-20180618]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Waiman-Long/ipc-IPCMNI-limit-check-for-mni-increase-that-limit/20180618-183206
config: i386-randconfig-a0-06181851 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from ipc/mqueue.c:43:0:
   ipc/util.h: In function 'sem_check_semmni':
>> ipc/util.h:251:54: error: 'ipcmni_max' undeclared (first use in this function)
     return ((ns->sem_ctls[3] < 0) || (ns->sem_ctls[3] > ipcmni_max))
                                                         ^
   ipc/util.h:251:54: note: each undeclared identifier is reported only once for each function it appears in

vim +/ipcmni_max +251 ipc/util.h

   239	
   240	struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
   241	int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
   242				const struct ipc_ops *ops, struct ipc_params *params);
   243	void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
   244			void (*free)(struct ipc_namespace *, struct kern_ipc_perm *));
   245	
   246	static inline int sem_check_semmni(struct ipc_namespace *ns) {
   247		/*
   248		 * Check semmni range [0, ipcmni_max]
   249		 * semmni is the last element of sem_ctls[4] array
   250		 */
 > 251		return ((ns->sem_ctls[3] < 0) || (ns->sem_ctls[3] > ipcmni_max))
   252			? -ERANGE : 0;
   253	}
   254	

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