linux-kernel - Re: [PATCH] Staging: comedi: das16: Fixed a const struct coding style issue

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Date:   Tue, 28 Nov 2017 10:37:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Alex Frappier Lachapelle <alex.frappierlachapelle@...il.com>
Cc:     kbuild-all@...org, greg@...ah.com, abbotti@....co.uk,
        hsweeten@...ionengravers.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        Alex Frappier Lachapelle <Alex.FrappierLachapelle@...il.com>
Subject: Re: [PATCH] Staging: comedi: das16: Fixed a const struct coding
 style issue

Hi Alex,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on staging/staging-testing]
[also build test ERROR on v4.15-rc1 next-20171127]
[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/Alex-Frappier-Lachapelle/Staging-comedi-das16-Fixed-a-const-struct-coding-style-issue/20171128-090836
config: x86_64-randconfig-x004-201748 (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   drivers/staging//comedi/drivers/das16.c: In function 'das16_ai_range':
>> drivers/staging//comedi/drivers/das16.c:980:18: error: assignment of member 'length' in read-only object
      lrange->length = 1;
                     ^
>> drivers/staging//comedi/drivers/das16.c:981:10: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      krange = lrange->range;
             ^
   drivers/staging//comedi/drivers/das16.c: In function 'das16_ao_range':
   drivers/staging//comedi/drivers/das16.c:1014:18: error: assignment of member 'length' in read-only object
      lrange->length = 1;
                     ^
   drivers/staging//comedi/drivers/das16.c:1015:10: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
      krange = lrange->range;
             ^

vim +/length +980 drivers/staging//comedi/drivers/das16.c

742c4a09 H Hartley Sweeten        2015-01-12  958  
0ce8280e H Hartley Sweeten        2015-01-26  959  static const struct comedi_lrange *das16_ai_range(struct comedi_device *dev,
0ce8280e H Hartley Sweeten        2015-01-26  960  						  struct comedi_subdevice *s,
0ce8280e H Hartley Sweeten        2015-01-26  961  						  struct comedi_devconfig *it,
0ce8280e H Hartley Sweeten        2015-01-26  962  						  unsigned int pg_type,
0ce8280e H Hartley Sweeten        2015-01-26  963  						  unsigned int status)
0ce8280e H Hartley Sweeten        2015-01-26  964  {
0ce8280e H Hartley Sweeten        2015-01-26  965  	unsigned int min = it->options[4];
0ce8280e H Hartley Sweeten        2015-01-26  966  	unsigned int max = it->options[5];
0ce8280e H Hartley Sweeten        2015-01-26  967  
0ce8280e H Hartley Sweeten        2015-01-26  968  	/* get any user-defined input range */
0ce8280e H Hartley Sweeten        2015-01-26  969  	if (pg_type == das16_pg_none && (min || max)) {
680d002a Alex Frappier Lachapelle 2017-11-25  970  		const struct comedi_lrange *lrange;
0ce8280e H Hartley Sweeten        2015-01-26  971  		struct comedi_krange *krange;
0ce8280e H Hartley Sweeten        2015-01-26  972  
0ce8280e H Hartley Sweeten        2015-01-26  973  		/* allocate single-range range table */
0ce8280e H Hartley Sweeten        2015-01-26  974  		lrange = comedi_alloc_spriv(s,
0ce8280e H Hartley Sweeten        2015-01-26  975  					    sizeof(*lrange) + sizeof(*krange));
0ce8280e H Hartley Sweeten        2015-01-26  976  		if (!lrange)
0ce8280e H Hartley Sweeten        2015-01-26  977  			return &range_unknown;
0ce8280e H Hartley Sweeten        2015-01-26  978  
0ce8280e H Hartley Sweeten        2015-01-26  979  		/* initialize ai range */
0ce8280e H Hartley Sweeten        2015-01-26 @980  		lrange->length = 1;
0ce8280e H Hartley Sweeten        2015-01-26 @981  		krange = lrange->range;
0ce8280e H Hartley Sweeten        2015-01-26  982  		krange->min = min;
0ce8280e H Hartley Sweeten        2015-01-26  983  		krange->max = max;
0ce8280e H Hartley Sweeten        2015-01-26  984  		krange->flags = UNIT_volt;
0ce8280e H Hartley Sweeten        2015-01-26  985  
0ce8280e H Hartley Sweeten        2015-01-26  986  		return lrange;
0ce8280e H Hartley Sweeten        2015-01-26  987  	}
0ce8280e H Hartley Sweeten        2015-01-26  988  
0ce8280e H Hartley Sweeten        2015-01-26  989  	/* use software programmable range */
0ce8280e H Hartley Sweeten        2015-01-26  990  	if (status & DAS16_STATUS_UNIPOLAR)
0ce8280e H Hartley Sweeten        2015-01-26  991  		return das16_ai_uni_lranges[pg_type];
0ce8280e H Hartley Sweeten        2015-01-26  992  	return das16_ai_bip_lranges[pg_type];
0ce8280e H Hartley Sweeten        2015-01-26  993  }
0ce8280e H Hartley Sweeten        2015-01-26  994  

:::::: The code at line 980 was first introduced by commit
:::::: 0ce8280e2876091b5c67cb515fae8e9bf3b50bfd staging: comedi: das16: introduce das16_ai_range()

:::::: TO: H Hartley Sweeten <hsweeten@...ionengravers.com>
:::::: CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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