Re: [PATCH 3/3] drm/bridge: Introduce LT9611 DSI to HDMI bridge

[kbuild test robot <lkp@intel.com>]

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Hi Vinod,

I love your patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on drm-intel/for-linux-next drm-tip/drm-tip linus/master v5.7-rc5 next-20200512]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Vinod-Koul/Add-LT9611-DSI-to-HDMI-bridge/20200513-181150
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: nios2-allyesconfig (attached as .config)
compiler: nios2-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=nios2 

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

All warnings (new ones prefixed by >>):

drivers/gpu/drm/bridge/lt9611.c: In function 'lt9611_reset':
drivers/gpu/drm/bridge/lt9611.c:518:2: error: implicit declaration of function 'gpiod_set_value_cansleep' [-Werror=implicit-function-declaration]
518 |  gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
|  ^~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c: In function 'lt9611_gpio_init':
drivers/gpu/drm/bridge/lt9611.c:963:23: error: implicit declaration of function 'devm_gpiod_get' [-Werror=implicit-function-declaration]
963 |  lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
|                       ^~~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:963:52: error: 'GPIOD_OUT_HIGH' undeclared (first use in this function)
963 |  lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
|                                                    ^~~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:963:52: note: each undeclared identifier is reported only once for each function it appears in
drivers/gpu/drm/bridge/lt9611.c:969:24: error: implicit declaration of function 'devm_gpiod_get_optional'; did you mean 'devm_regulator_get_optional'? [-Werror=implicit-function-declaration]
969 |  lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
|                        ^~~~~~~~~~~~~~~~~~~~~~~
|                        devm_regulator_get_optional
drivers/gpu/drm/bridge/lt9611.c:970:13: error: 'GPIOD_OUT_LOW' undeclared (first use in this function)
970 |             GPIOD_OUT_LOW);
|             ^~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c: At top level:
drivers/gpu/drm/bridge/lt9611.c:1100:1: warning: data definition has no type or storage class
1100 | MODULE_DEVICE_TABLE(of, lt9611_match_table);
| ^~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1100:1: error: type defaults to 'int' in declaration of 'MODULE_DEVICE_TABLE' [-Werror=implicit-int]
drivers/gpu/drm/bridge/lt9611.c:1100:1: warning: parameter names (without types) in function declaration
In file included from include/linux/device.h:31,
from include/linux/platform_device.h:13,
from drivers/gpu/drm/bridge/lt9611.c:7:
include/linux/device/driver.h:263:1: warning: data definition has no type or storage class
263 | module_init(__driver##_init);          | ^~~~~~~~~~~
include/linux/i2c.h:923:2: note: in expansion of macro 'module_driver'
923 |  module_driver(__i2c_driver, i2c_add_driver,          |  ^~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1111:1: note: in expansion of macro 'module_i2c_driver'
1111 | module_i2c_driver(lt9611_driver);
| ^~~~~~~~~~~~~~~~~
include/linux/device/driver.h:263:1: error: type defaults to 'int' in declaration of 'module_init' [-Werror=implicit-int]
263 | module_init(__driver##_init);          | ^~~~~~~~~~~
include/linux/i2c.h:923:2: note: in expansion of macro 'module_driver'
923 |  module_driver(__i2c_driver, i2c_add_driver,          |  ^~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1111:1: note: in expansion of macro 'module_i2c_driver'
1111 | module_i2c_driver(lt9611_driver);
| ^~~~~~~~~~~~~~~~~
In file included from include/linux/linkage.h:7,
from include/linux/kernel.h:8,
from include/asm-generic/bug.h:19,
from ./arch/nios2/include/generated/asm/bug.h:1,
from include/linux/bug.h:5,
from include/linux/thread_info.h:12,
from include/asm-generic/current.h:5,
from ./arch/nios2/include/generated/asm/current.h:1,
from include/linux/sched.h:12,
from include/linux/ratelimit.h:6,
from include/linux/dev_printk.h:16,
from include/linux/device.h:15,
from include/linux/platform_device.h:13,
from drivers/gpu/drm/bridge/lt9611.c:7:
>> include/linux/export.h:19:30: warning: parameter names (without types) in function declaration
19 | #define THIS_MODULE ((struct module *)0)
|                              ^~~~~~
include/linux/i2c.h:855:22: note: in expansion of macro 'THIS_MODULE'
855 |  i2c_register_driver(THIS_MODULE, driver)
|                      ^~~~~~~~~~~
include/linux/device/driver.h:261:9: note: in expansion of macro 'i2c_add_driver'
261 |  return __register(&(__driver) , ##__VA_ARGS__);          |         ^~~~~~~~~~
include/linux/i2c.h:923:2: note: in expansion of macro 'module_driver'
923 |  module_driver(__i2c_driver, i2c_add_driver,          |  ^~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1111:1: note: in expansion of macro 'module_i2c_driver'
1111 | module_i2c_driver(lt9611_driver);
| ^~~~~~~~~~~~~~~~~
In file included from include/linux/device.h:31,
from include/linux/platform_device.h:13,
from drivers/gpu/drm/bridge/lt9611.c:7:
include/linux/device/driver.h:268:1: warning: data definition has no type or storage class
268 | module_exit(__driver##_exit);
| ^~~~~~~~~~~
include/linux/i2c.h:923:2: note: in expansion of macro 'module_driver'
923 |  module_driver(__i2c_driver, i2c_add_driver,          |  ^~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1111:1: note: in expansion of macro 'module_i2c_driver'
1111 | module_i2c_driver(lt9611_driver);
| ^~~~~~~~~~~~~~~~~
include/linux/device/driver.h:268:1: error: type defaults to 'int' in declaration of 'module_exit' [-Werror=implicit-int]
268 | module_exit(__driver##_exit);
| ^~~~~~~~~~~
include/linux/i2c.h:923:2: note: in expansion of macro 'module_driver'
923 |  module_driver(__i2c_driver, i2c_add_driver,          |  ^~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1111:1: note: in expansion of macro 'module_i2c_driver'
1111 | module_i2c_driver(lt9611_driver);
| ^~~~~~~~~~~~~~~~~
In file included from include/linux/linkage.h:7,
from include/linux/kernel.h:8,
from include/asm-generic/bug.h:19,
from ./arch/nios2/include/generated/asm/bug.h:1,
from include/linux/bug.h:5,
from include/linux/thread_info.h:12,
from include/asm-generic/current.h:5,
from ./arch/nios2/include/generated/asm/current.h:1,
from include/linux/sched.h:12,
from include/linux/ratelimit.h:6,
from include/linux/dev_printk.h:16,
from include/linux/device.h:15,
from include/linux/platform_device.h:13,
from drivers/gpu/drm/bridge/lt9611.c:7:
>> include/linux/export.h:19:30: warning: parameter names (without types) in function declaration
19 | #define THIS_MODULE ((struct module *)0)
|                              ^~~~~~
include/linux/i2c.h:855:22: note: in expansion of macro 'THIS_MODULE'
855 |  i2c_register_driver(THIS_MODULE, driver)
|                      ^~~~~~~~~~~
include/linux/device/driver.h:261:9: note: in expansion of macro 'i2c_add_driver'
261 |  return __register(&(__driver) , ##__VA_ARGS__);          |         ^~~~~~~~~~
include/linux/i2c.h:923:2: note: in expansion of macro 'module_driver'
923 |  module_driver(__i2c_driver, i2c_add_driver,          |  ^~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1111:1: note: in expansion of macro 'module_i2c_driver'
1111 | module_i2c_driver(lt9611_driver);
| ^~~~~~~~~~~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1113:16: error: expected declaration specifiers or '...' before string constant
1113 | MODULE_LICENSE("GPL v2");
|                ^~~~~~~~
In file included from include/linux/device.h:31,
from include/linux/platform_device.h:13,
from drivers/gpu/drm/bridge/lt9611.c:7:
drivers/gpu/drm/bridge/lt9611.c:1111:19: warning: 'lt9611_driver_init' defined but not used [-Wunused-function]
1111 | module_i2c_driver(lt9611_driver);
|                   ^~~~~~~~~~~~~
include/linux/device/driver.h:259:19: note: in definition of macro 'module_driver'
259 | static int __init __driver##_init(void)          |                   ^~~~~~~~
drivers/gpu/drm/bridge/lt9611.c:1111:1: note: in expansion of macro 'module_i2c_driver'
1111 | module_i2c_driver(lt9611_driver);
| ^~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +19 include/linux/export.h

b67067f1176df6 Nicholas Piggin 2016-08-24   4  
f50169324df4ad Paul Gortmaker  2011-05-23   5  /*
f50169324df4ad Paul Gortmaker  2011-05-23   6   * Export symbols from the kernel to modules.  Forked from module.h
f50169324df4ad Paul Gortmaker  2011-05-23   7   * to reduce the amount of pointless cruft we feed to gcc when only
f50169324df4ad Paul Gortmaker  2011-05-23   8   * exporting a simple symbol or two.
f50169324df4ad Paul Gortmaker  2011-05-23   9   *
b92021b09df70c Rusty Russell   2013-03-15  10   * Try not to add #includes here.  It slows compilation and makes kernel
b92021b09df70c Rusty Russell   2013-03-15  11   * hackers place grumpy comments in header files.
f50169324df4ad Paul Gortmaker  2011-05-23  12   */
f50169324df4ad Paul Gortmaker  2011-05-23  13  
b92021b09df70c Rusty Russell   2013-03-15  14  #ifndef __ASSEMBLY__
f50169324df4ad Paul Gortmaker  2011-05-23  15  #ifdef MODULE
f50169324df4ad Paul Gortmaker  2011-05-23  16  extern struct module __this_module;
f50169324df4ad Paul Gortmaker  2011-05-23  17  #define THIS_MODULE (&__this_module)
f50169324df4ad Paul Gortmaker  2011-05-23  18  #else
f50169324df4ad Paul Gortmaker  2011-05-23 @19  #define THIS_MODULE ((struct module *)0)
f50169324df4ad Paul Gortmaker  2011-05-23  20  #endif
f50169324df4ad Paul Gortmaker  2011-05-23  21  

:::::: The code at line 19 was first introduced by commit
:::::: f50169324df4ad942e544386d136216c8617636a module.h: split out the EXPORT_SYMBOL into export.h

:::::: TO: Paul Gortmaker <paul.gortmaker@windriver.com>
:::::: CC: Paul Gortmaker <paul.gortmaker@windriver.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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