Hi Alexey,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/irq/core]
[also build test ERROR on linus/master linux/master v5.10-rc4 next-20201120]
[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]

url:    https://github.com/0day-ci/linux/commits/Alexey-Kardashevskiy/genirq-irqdomain-Add-reference-counting-to-IRQs/20201109-175020
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git d315c627a18249930750fe4eb2b21f3fe9b32ea4
config: m68k-randconfig-m031-20201122 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/3fe0622aa0aeca70507a5e71b599bed6be0be581
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Alexey-Kardashevskiy/genirq-irqdomain-Add-reference-counting-to-IRQs/20201109-175020
        git checkout 3fe0622aa0aeca70507a5e71b599bed6be0be581
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k 

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

All errors (new ones prefixed by >>):

   kernel/irq/irqdomain.c: In function 'irq_create_mapping':
>> kernel/irq/irqdomain.c:672:20: error: 'struct irq_desc' has no member named 'kobj'
     672 |   kobject_get(&desc->kobj);
         |                    ^~
   kernel/irq/irqdomain.c: In function 'irq_create_fwspec_mapping':
   kernel/irq/irqdomain.c:807:21: error: 'struct irq_desc' has no member named 'kobj'
     807 |    kobject_get(&desc->kobj);
         |                     ^~
   kernel/irq/irqdomain.c:822:21: error: 'struct irq_desc' has no member named 'kobj'
     822 |    kobject_get(&desc->kobj);
         |                     ^~
   kernel/irq/irqdomain.c: In function 'irq_dispose_mapping':
   kernel/irq/irqdomain.c:880:19: error: 'struct irq_desc' has no member named 'kobj'
     880 |  kobject_put(&desc->kobj);
         |                   ^~
   kernel/irq/irqdomain.c: In function '__irq_domain_alloc_irqs':
   kernel/irq/irqdomain.c:1473:21: error: 'struct irq_desc' has no member named 'kobj'
    1473 |    kobject_get(&desc->kobj);
         |                     ^~

vim +672 kernel/irq/irqdomain.c

   636	
   637	/**
   638	 * irq_create_mapping() - Map a hardware interrupt into linux irq space
   639	 * @domain: domain owning this hardware interrupt or NULL for default domain
   640	 * @hwirq: hardware irq number in that domain space
   641	 *
   642	 * Only one mapping per hardware interrupt is permitted. Returns a linux
   643	 * irq number.
   644	 * If the sense/trigger is to be specified, set_irq_type() should be called
   645	 * on the number returned from that call.
   646	 */
   647	unsigned int irq_create_mapping(struct irq_domain *domain,
   648					irq_hw_number_t hwirq)
   649	{
   650		struct device_node *of_node;
   651		int virq;
   652		struct irq_desc *desc;
   653	
   654		pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
   655	
   656		/* Look for default domain if nececssary */
   657		if (domain == NULL)
   658			domain = irq_default_domain;
   659		if (domain == NULL) {
   660			WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
   661			return 0;
   662		}
   663		pr_debug("-> using domain @%p\n", domain);
   664	
   665		of_node = irq_domain_get_of_node(domain);
   666	
   667		/* Check if mapping already exists */
   668		virq = irq_find_mapping(domain, hwirq);
   669		if (virq) {
   670			desc = irq_to_desc(virq);
   671			pr_debug("-> existing mapping on virq %d\n", virq);
 > 672			kobject_get(&desc->kobj);
   673			return virq;
   674		}
   675	
   676		/* Allocate a virtual interrupt number */
   677		virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), NULL);
   678		if (virq <= 0) {
   679			pr_debug("-> virq allocation failed\n");
   680			return 0;
   681		}
   682	
   683		if (irq_domain_associate(domain, virq, hwirq)) {
   684			irq_free_desc(virq);
   685			return 0;
   686		}
   687	
   688		pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
   689			hwirq, of_node_full_name(of_node), virq);
   690	
   691		return virq;
   692	}
   693	EXPORT_SYMBOL_GPL(irq_create_mapping);
   694	

---
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