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Date:   Sun, 15 Oct 2017 16:08:04 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Bhumika Goyal <bhumirks@...il.com>
Cc:     kbuild-all@...org, julia.lawall@...6.fr, rjw@...ysocki.net,
        lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Bhumika Goyal <bhumirks@...il.com>
Subject: Re: [PATCH] ACPI: configfs: make config_item_type const

Hi Bhumika,

[auto build test WARNING on pm/linux-next]
[also build test WARNING on v4.14-rc4 next-20171013]
[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/Bhumika-Goyal/ACPI-configfs-make-config_item_type-const/20171015-153321
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: x86_64-randconfig-x018-201742 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   drivers/acpi/acpi_configfs.c: In function 'acpi_table_make_item':
>> drivers/acpi/acpi_configfs.c:222:48: warning: passing argument 3 of 'config_item_init_type_name' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     config_item_init_type_name(&table->cfg, name, &acpi_table_type);
                                                   ^
   In file included from drivers/acpi/acpi_configfs.c:15:0:
   include/linux/configfs.h:73:13: note: expected 'struct config_item_type *' but argument is of type 'const struct config_item_type *'
    extern void config_item_init_type_name(struct config_item *item,
                ^~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/acpi/acpi_configfs.c: At top level:
>> drivers/acpi/acpi_configfs.c:253:15: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
       .ci_type = &acpi_root_group_type,
                  ^
   drivers/acpi/acpi_configfs.c: In function 'acpi_configfs_init':
>> drivers/acpi/acpi_configfs.c:271:11: warning: passing argument 3 of 'configfs_register_default_group' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
              &acpi_tables_type);
              ^
   In file included from drivers/acpi/acpi_configfs.c:15:0:
   include/linux/configfs.h:262:1: note: expected 'struct config_item_type *' but argument is of type 'const struct config_item_type *'
    configfs_register_default_group(struct config_group *parent_group,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +222 drivers/acpi/acpi_configfs.c

612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  212  
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  213  static struct config_item *acpi_table_make_item(struct config_group *group,
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  214  						const char *name)
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  215  {
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  216  	struct acpi_table *table;
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  217  
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  218  	table = kzalloc(sizeof(*table), GFP_KERNEL);
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  219  	if (!table)
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  220  		return ERR_PTR(-ENOMEM);
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  221  
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08 @222  	config_item_init_type_name(&table->cfg, name, &acpi_table_type);
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  223  	return &table->cfg;
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  224  }
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  225  
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  226  static void acpi_table_drop_item(struct config_group *group,
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  227  				 struct config_item *cfg)
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  228  {
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  229  	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  230  
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  231  	ACPI_INFO(("Host-directed Dynamic ACPI Table Unload"));
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  232  	acpi_tb_unload_table(table->index);
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  233  }
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  234  
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  235  struct configfs_group_operations acpi_table_group_ops = {
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  236  	.make_item = acpi_table_make_item,
772bf1e2 drivers/acpi/acpi_configfs.c Jan Kiszka       2017-06-09  237  	.drop_item = acpi_table_drop_item,
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  238  };
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  239  
39f59af3 drivers/acpi/acpi_configfs.c Bhumika Goyal    2017-10-12  240  static const struct config_item_type acpi_tables_type = {
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  241  	.ct_owner = THIS_MODULE,
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  242  	.ct_group_ops = &acpi_table_group_ops,
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  243  };
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  244  
39f59af3 drivers/acpi/acpi_configfs.c Bhumika Goyal    2017-10-12  245  static const struct config_item_type acpi_root_group_type = {
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  246  	.ct_owner = THIS_MODULE,
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  247  };
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  248  
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  249  static struct configfs_subsystem acpi_configfs = {
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  250  	.su_group = {
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  251  		.cg_item = {
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  252  			.ci_namebuf = "acpi",
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08 @253  			.ci_type = &acpi_root_group_type,
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  254  		},
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  255  	},
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  256  	.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  257  };
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  258  
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  259  static int __init acpi_configfs_init(void)
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  260  {
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  261  	int ret;
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  262  	struct config_group *root = &acpi_configfs.su_group;
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  263  
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  264  	config_group_init(root);
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  265  
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  266  	ret = configfs_register_subsystem(&acpi_configfs);
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  267  	if (ret)
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  268  		return ret;
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  269  
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  270  	acpi_table_group = configfs_register_default_group(root, "table",
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08 @271  							   &acpi_tables_type);
612bd01f drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  272  	return PTR_ERR_OR_ZERO(acpi_table_group);
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  273  }
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  274  module_init(acpi_configfs_init);
0bf54fcd drivers/acpi/configfs.c      Octavian Purdila 2016-07-08  275  

:::::: The code at line 222 was first introduced by commit
:::::: 612bd01fc6e04c3ce9eb59587b4a7e4ebd6aff35 ACPI: add support for loading SSDTs via configfs

:::::: TO: Octavian Purdila <octavian.purdila@...el.com>
:::::: CC: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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