linux-kernel - Re: [PATCH v1] misc: apds990x: Use sysfs_match

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Date:   Sat, 10 Jun 2017 15:17:02 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v1] misc: apds990x: Use sysfs_match_string() helper

Hi Andy,

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on v4.12-rc4 next-20170609]
[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/Andy-Shevchenko/misc-apds990x-Use-sysfs_match_string-helper/20170610-131929
config: x86_64-rhel (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 errors (new ones prefixed by >>):

   In file included from include/linux/bitmap.h:8:0,
                    from include/linux/cpumask.h:11,
                    from arch/x86/include/asm/cpumask.h:4,
                    from arch/x86/include/asm/msr.h:10,
                    from arch/x86/include/asm/processor.h:20,
                    from arch/x86/include/asm/cpufeature.h:4,
                    from arch/x86/include/asm/thread_info.h:52,
                    from include/linux/thread_info.h:37,
                    from arch/x86/include/asm/preempt.h:6,
                    from include/linux/preempt.h:80,
                    from include/linux/spinlock.h:50,
                    from include/linux/seqlock.h:35,
                    from include/linux/time.h:5,
                    from include/linux/stat.h:18,
                    from include/linux/module.h:10,
                    from drivers/misc/apds990x.c:26:
   drivers/misc/apds990x.c: In function 'apds990x_prox_reporting_mode_store':
>> drivers/misc/apds990x.c:861:27: error: passing argument 1 of '__sysfs_match_string' from incompatible pointer type [-Werror=incompatible-pointer-types]
     ret = sysfs_match_string(reporting_modes, buf);
                              ^
   include/linux/string.h:155:57: note: in definition of macro 'sysfs_match_string'
    #define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
                                                            ^~
   include/linux/string.h:146:5: note: expected 'const char * const*' but argument is of type 'const char (*)[9]'
    int __sysfs_match_string(const char * const *array, size_t n, const char *s);
        ^~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/__sysfs_match_string +861 drivers/misc/apds990x.c

   855					  struct device_attribute *attr,
   856					  const char *buf, size_t len)
   857	{
   858		struct apds990x_chip *chip =  dev_get_drvdata(dev);
   859		int ret;
   860	
 > 861		ret = sysfs_match_string(reporting_modes, buf);
   862		if (ret < 0)
   863			return ret;
   864	

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