[driver-core:kobject-const-2 71/77] drivers/irqchip/irq-mbigen.c:248:43: error: 'struct bus_type' has no member named 'dev_root'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git kobject-const-2
head:   edb07d61689645fa19378a7a18451f91c8414b5a
commit: 7389911cf9a8bc346a6aa2662645298627c44cb6 [71/77] driver core: bus: move dev_root out of struct bus_type
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20230211/[email protected]/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
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://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commit/?id=7389911cf9a8bc346a6aa2662645298627c44cb6
        git remote add driver-core https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
        git fetch --no-tags driver-core kobject-const-2
        git checkout 7389911cf9a8bc346a6aa2662645298627c44cb6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

   drivers/irqchip/irq-mbigen.c: In function 'mbigen_of_create_domain':
>> drivers/irqchip/irq-mbigen.c:248:43: error: 'struct bus_type' has no member named 'dev_root'
     248 |                 parent = platform_bus_type.dev_root;
         |                                           ^


vim +248 drivers/irqchip/irq-mbigen.c

9650c60ebfec05 Ma Jun          2015-12-17  234  
76e1f77f9c26ec Kefeng Wang     2017-03-07  235  static int mbigen_of_create_domain(struct platform_device *pdev,
76e1f77f9c26ec Kefeng Wang     2017-03-07  236  				   struct mbigen_device *mgn_chip)
717c3dbc118ecb Ma Jun          2015-12-17  237  {
76e1f77f9c26ec Kefeng Wang     2017-03-07  238  	struct device *parent;
ed2a1002d25ccd MaJun           2016-03-17  239  	struct platform_device *child;
9650c60ebfec05 Ma Jun          2015-12-17  240  	struct irq_domain *domain;
ed2a1002d25ccd MaJun           2016-03-17  241  	struct device_node *np;
9650c60ebfec05 Ma Jun          2015-12-17  242  	u32 num_pins;
717c3dbc118ecb Ma Jun          2015-12-17  243  
ed2a1002d25ccd MaJun           2016-03-17  244  	for_each_child_of_node(pdev->dev.of_node, np) {
ed2a1002d25ccd MaJun           2016-03-17  245  		if (!of_property_read_bool(np, "interrupt-controller"))
ed2a1002d25ccd MaJun           2016-03-17  246  			continue;
ed2a1002d25ccd MaJun           2016-03-17  247  
ed2a1002d25ccd MaJun           2016-03-17 @248  		parent = platform_bus_type.dev_root;
ed2a1002d25ccd MaJun           2016-03-17  249  		child = of_platform_device_create(np, NULL, parent);
321275f0d8f593 Nishka Dasgupta 2019-07-23  250  		if (!child) {
321275f0d8f593 Nishka Dasgupta 2019-07-23  251  			of_node_put(np);
086eec2de00ef5 Dan Carpenter   2016-04-04  252  			return -ENOMEM;
321275f0d8f593 Nishka Dasgupta 2019-07-23  253  		}
ed2a1002d25ccd MaJun           2016-03-17  254  
ed2a1002d25ccd MaJun           2016-03-17  255  		if (of_property_read_u32(child->dev.of_node, "num-pins",
ed2a1002d25ccd MaJun           2016-03-17  256  					 &num_pins) < 0) {
9650c60ebfec05 Ma Jun          2015-12-17  257  			dev_err(&pdev->dev, "No num-pins property\n");
321275f0d8f593 Nishka Dasgupta 2019-07-23  258  			of_node_put(np);
9650c60ebfec05 Ma Jun          2015-12-17  259  			return -EINVAL;
9650c60ebfec05 Ma Jun          2015-12-17  260  		}
9650c60ebfec05 Ma Jun          2015-12-17  261  
ed2a1002d25ccd MaJun           2016-03-17  262  		domain = platform_msi_create_device_domain(&child->dev, num_pins,
9650c60ebfec05 Ma Jun          2015-12-17  263  							   mbigen_write_msg,
9650c60ebfec05 Ma Jun          2015-12-17  264  							   &mbigen_domain_ops,
9650c60ebfec05 Ma Jun          2015-12-17  265  							   mgn_chip);
321275f0d8f593 Nishka Dasgupta 2019-07-23  266  		if (!domain) {
321275f0d8f593 Nishka Dasgupta 2019-07-23  267  			of_node_put(np);
9650c60ebfec05 Ma Jun          2015-12-17  268  			return -ENOMEM;
ed2a1002d25ccd MaJun           2016-03-17  269  		}
321275f0d8f593 Nishka Dasgupta 2019-07-23  270  	}
9650c60ebfec05 Ma Jun          2015-12-17  271  
76e1f77f9c26ec Kefeng Wang     2017-03-07  272  	return 0;
76e1f77f9c26ec Kefeng Wang     2017-03-07  273  }
76e1f77f9c26ec Kefeng Wang     2017-03-07  274  

:::::: The code at line 248 was first introduced by commit
:::::: ed2a1002d25ccdb6606c8ccb608524118bd30614 irqchip/mbigen: Handle multiple device nodes in a mbigen module

:::::: TO: MaJun <[email protected]>
:::::: CC: Thomas Gleixner <[email protected]>

-- 
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https://github.com/intel/lkp-tests
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