tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/tip/tip.git irq/urgent
head:   e1ee29624746fbf667f80e8ae3815a76e4d1bd5b
commit: e1ee29624746fbf667f80e8ae3815a76e4d1bd5b [1/1] genirq: Properly pair kobject_del() with kobject_add()
config: powerpc-allnoconfig (attached as .config)
compiler: powerpc-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout e1ee29624746fbf667f80e8ae3815a76e4d1bd5b
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   kernel/irq/irqdesc.c: In function 'free_desc':
>> kernel/irq/irqdesc.c:446:6: error: 'irq_kobj_base' undeclared (first use in this function); did you mean 'irq_kobj_type'?
     if (irq_kobj_base)
         ^~~~~~~~~~~~~
         irq_kobj_type
   kernel/irq/irqdesc.c:446:6: note: each undeclared identifier is reported only once for each function it appears in

vim +446 kernel/irq/irqdesc.c

   424	
   425	static void free_desc(unsigned int irq)
   426	{
   427		struct irq_desc *desc = irq_to_desc(irq);
   428	
   429		irq_remove_debugfs_entry(desc);
   430		unregister_irq_proc(irq, desc);
   431	
   432		/*
   433		 * sparse_irq_lock protects also show_interrupts() and
   434		 * kstat_irq_usr(). Once we deleted the descriptor from the
   435		 * sparse tree we can free it. Access in proc will fail to
   436		 * lookup the descriptor.
   437		 *
   438		 * The sysfs entry must be serialized against a concurrent
   439		 * irq_sysfs_init() as well.
   440		 *
   441		 * If irq_sysfs_init() has not yet been invoked (early boot), then
   442		 * irq_kobj_base is NULL and the descriptor was never added.
   443		 * kobject_del() complains about a object with no parent, so make
   444		 * it conditional.
   445		 */
 > 446		if (irq_kobj_base)
   447			kobject_del(&desc->kobj);
   448		delete_irq_desc(irq);
   449	
   450		/*
   451		 * We free the descriptor, masks and stat fields via RCU. That
   452		 * allows demultiplex interrupts to do rcu based management of
   453		 * the child interrupts.
   454		 * This also allows us to use rcu in kstat_irqs_usr().
   455		 */
   456		call_rcu(&desc->rcu, delayed_free_desc);
   457	}
   458	

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