linux-kernel - Re: [PATCH v8 4/4] gpio: xilinx: Utilize for_each_set

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Message-ID: <202006160420.iatdr9ab%lkp@intel.com>
Date:   Tue, 16 Jun 2020 04:09:23 +0800
From:   kernel test robot <lkp@...el.com>
To:     Syed Nayyar Waris <syednwaris@...il.com>, linus.walleij@...aro.org,
        akpm@...ux-foundation.org
Cc:     kbuild-all@...ts.01.org, andriy.shevchenko@...ux.intel.com,
        vilhelm.gray@...il.com, bgolaszewski@...libre.com,
        michal.simek@...inx.com, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 4/4] gpio: xilinx: Utilize for_each_set_clump macro

Hi Syed,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on 444fc5cde64330661bf59944c43844e7d4c2ccd8]

url:    https://github.com/0day-ci/linux/commits/Syed-Nayyar-Waris/Introduce-the-for_each_set_clump-macro/20200615-205729
base:    444fc5cde64330661bf59944c43844e7d4c2ccd8
config: sparc64-randconfig-s032-20200615 (attached as .config)
compiler: sparc64-linux-gcc (GCC) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-rc1-3-g55607964-dirty
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=sparc64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

>> include/linux/bitmap.h:639:45: sparse: sparse: shift too big (64) for type unsigned long
>> include/linux/bitmap.h:639:45: sparse: sparse: shift too big (64) for type unsigned long
   include/linux/bitmap.h:594:63: sparse: sparse: shift too big (64) for type unsigned long
>> include/linux/bitmap.h:639:45: sparse: sparse: shift too big (64) for type unsigned long
>> include/linux/bitmap.h:638:17: sparse: sparse: invalid access past the end of 'old' (8 8)

vim +639 include/linux/bitmap.h

169c474fb22d8a William Breathitt Gray 2019-12-04  613  
803024b6c8a375 Syed Nayyar Waris      2020-06-15  614  /**
803024b6c8a375 Syed Nayyar Waris      2020-06-15  615   * bitmap_set_value - set n-bit value within a memory region
803024b6c8a375 Syed Nayyar Waris      2020-06-15  616   * @map: address to the bitmap memory region
803024b6c8a375 Syed Nayyar Waris      2020-06-15  617   * @value: value of nbits
803024b6c8a375 Syed Nayyar Waris      2020-06-15  618   * @start: bit offset of the n-bit value
803024b6c8a375 Syed Nayyar Waris      2020-06-15  619   * @nbits: size of value in bits
803024b6c8a375 Syed Nayyar Waris      2020-06-15  620   */
803024b6c8a375 Syed Nayyar Waris      2020-06-15  621  static inline void bitmap_set_value(unsigned long *map,
803024b6c8a375 Syed Nayyar Waris      2020-06-15  622  				    unsigned long value,
803024b6c8a375 Syed Nayyar Waris      2020-06-15  623  				    unsigned long start, unsigned long nbits)
803024b6c8a375 Syed Nayyar Waris      2020-06-15  624  {
803024b6c8a375 Syed Nayyar Waris      2020-06-15  625  	const size_t index = BIT_WORD(start);
803024b6c8a375 Syed Nayyar Waris      2020-06-15  626  	const unsigned long offset = start % BITS_PER_LONG;
803024b6c8a375 Syed Nayyar Waris      2020-06-15  627  	const unsigned long ceiling = roundup(start + 1, BITS_PER_LONG);
803024b6c8a375 Syed Nayyar Waris      2020-06-15  628  	const unsigned long space = ceiling - start;
803024b6c8a375 Syed Nayyar Waris      2020-06-15  629  
803024b6c8a375 Syed Nayyar Waris      2020-06-15  630  	value &= GENMASK(nbits - 1, 0);
803024b6c8a375 Syed Nayyar Waris      2020-06-15  631  
803024b6c8a375 Syed Nayyar Waris      2020-06-15  632  	if (space >= nbits) {
803024b6c8a375 Syed Nayyar Waris      2020-06-15  633  		map[index] &= ~(GENMASK(nbits + offset - 1, offset));
803024b6c8a375 Syed Nayyar Waris      2020-06-15  634  		map[index] |= value << offset;
803024b6c8a375 Syed Nayyar Waris      2020-06-15  635  	} else {
803024b6c8a375 Syed Nayyar Waris      2020-06-15  636  		map[index] &= ~BITMAP_FIRST_WORD_MASK(start);
803024b6c8a375 Syed Nayyar Waris      2020-06-15  637  		map[index] |= value << offset;
803024b6c8a375 Syed Nayyar Waris      2020-06-15 @638  		map[index + 1] &= ~BITMAP_LAST_WORD_MASK(start + nbits);
803024b6c8a375 Syed Nayyar Waris      2020-06-15 @639  		map[index + 1] |= (value >> space);
803024b6c8a375 Syed Nayyar Waris      2020-06-15  640  	}
803024b6c8a375 Syed Nayyar Waris      2020-06-15  641  }
803024b6c8a375 Syed Nayyar Waris      2020-06-15  642  

:::::: The code at line 639 was first introduced by commit
:::::: 803024b6c8a375ba9e9e9467595d7d52d4f6a38e bitops: Introduce the for_each_set_clump macro

:::::: TO: Syed Nayyar Waris <syednwaris@...il.com>
:::::: CC: 0day robot <lkp@...el.com>

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

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