linux-kernel - Re: [PATCH v6 2/4] i2c-smbus : Add client discovered ARA support

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Date:   Tue, 26 Dec 2017 09:43:39 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Marc CAPDEVILLE <m.capdeville@...log.org>
Cc:     kbuild-all@...org, Kevin Tsai <ktsai@...ellamicro.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Wolfram Sang <wsa@...-dreams.de>, linux-iio@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Marc CAPDEVILLE <m.capdeville@...log.org>
Subject: Re: [PATCH v6 2/4] i2c-smbus : Add client discovered ARA support

Hi Marc,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on wsa/i2c/for-next]
[also build test WARNING on v4.15-rc5 next-20171222]
[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/Marc-CAPDEVILLE/i2c-core-acpi-Add-i2c_acpi_set_connection/20171226-083729
base:   https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next
config: ia64-defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.2.0
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
        make.cross ARCH=ia64 

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/posix_types.h:5:0,
                    from include/uapi/linux/types.h:14,
                    from include/linux/compiler.h:164,
                    from include/linux/ioport.h:13,
                    from include/linux/acpi.h:25,
                    from drivers//i2c/i2c-core-base.c:24:
   include/linux/i2c-smbus.h: In function 'i2c_require_smbus_alert':
>> include/linux/stddef.h:8:14: warning: return makes integer from pointer without a cast [-Wint-conversion]
    #define NULL ((void *)0)
                 ^
>> include/linux/i2c-smbus.h:67:9: note: in expansion of macro 'NULL'
     return NULL;
            ^~~~
   include/linux/i2c-smbus.h: In function 'i2c_smbus_alert_event':
>> include/linux/stddef.h:8:14: warning: return makes integer from pointer without a cast [-Wint-conversion]
    #define NULL ((void *)0)
                 ^
   include/linux/i2c-smbus.h:72:9: note: in expansion of macro 'NULL'
     return NULL;
            ^~~~

vim +/NULL +67 include/linux/i2c-smbus.h

    60	
    61	#if IS_ENABLED(CONFIG_I2C_SMBUS)
    62	int i2c_require_smbus_alert(struct i2c_client *client);
    63	int i2c_smbus_alert_event(struct i2c_client *client);
    64	#else
    65	static inline int i2c_require_smbus_alert(struct i2c_client *client)
    66	{
  > 67		return NULL;
    68	}
    69	

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