linux-kernel - [norov:gup 45/48] lib/bitmap.c:1570:17: error: initializing 'unsigned long *' with an expression of type 'const unsigned long *' discards qualifiers

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Date:   Wed, 4 May 2022 10:02:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     Yury Norov <yury.norov@...il.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [norov:gup 45/48] lib/bitmap.c:1570:17: error: initializing
 'unsigned long *' with an expression of type 'const unsigned long *'
 discards qualifiers

Hi Yury,

FYI, the error/warning still remains.

tree:   https://github.com/norov/linux gup
head:   c96226d23c745b114dc041e0d8d0c272b280c71a
commit: f1cbd19c47bf73d532ff30571601c7ede57d5f82 [45/48] lib: add bitmap_{from,to}_arr64
config: mips-randconfig-r015-20220501 (https://download.01.org/0day-ci/archive/20220504/202205041022.rYfACmSF-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 363b3a645a1e30011cc8da624f13dac5fd915628)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/norov/linux/commit/f1cbd19c47bf73d532ff30571601c7ede57d5f82
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov gup
        git checkout f1cbd19c47bf73d532ff30571601c7ede57d5f82
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

>> lib/bitmap.c:1570:17: error: initializing 'unsigned long *' with an expression of type 'const unsigned long *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           unsigned long *end = bitmap + BITS_TO_LONGS(nbits);
                          ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   lib/bitmap.c:1575:22: warning: shift count >= width of type [-Wshift-count-overflow]
                           *buf |= *bitmap++ << 32;
                                             ^  ~~
   1 warning and 1 error generated.


vim +1570 lib/bitmap.c

  1561	
  1562	/**
  1563	 * bitmap_to_arr64 - copy the contents of bitmap to a u64 array of bits
  1564	 *	@buf: array of u64 (in host byte order), the dest bitmap
  1565	 *	@bitmap: array of unsigned longs, the source bitmap
  1566	 *	@nbits: number of bits in @bitmap
  1567	 */
  1568	void bitmap_to_arr64(u64 *buf, const unsigned long *bitmap, unsigned int nbits)
  1569	{
> 1570		unsigned long *end = bitmap + BITS_TO_LONGS(nbits);

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp