linux-kernel - [dhowells-fs:netfs-folio-regions 17/33] fs/netfs/write_helper.c:25:26: warning: comparison of distinct pointer types ('typeof (((1UL) << (12)) - offset) *' (aka 'unsigned long *') and 'typeof (size) *' (aka 'unsigned int *'))

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Date:   Thu, 26 Aug 2021 02:58:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [dhowells-fs:netfs-folio-regions 17/33]
 fs/netfs/write_helper.c:25:26: warning: comparison of distinct pointer types
 ('typeof (((1UL) << (12)) - offset) *' (aka 'unsigned long *') and 'typeof
 (size) *' (aka 'unsigned int *'))

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git netfs-folio-regions
head:   bee78a1e3c9ae86d025b0b8f44c2553228fd9d2c
commit: 3ef8de77f6481b47212b87940b5f541339eb49fa [17/33] netfs: Keep lists of pending, active, dirty and flushed regions
config: riscv-randconfig-c006-20210825 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project ea08c4cd1c0869ec5024a8bb3f5cdf06ab03ae83)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?id=3ef8de77f6481b47212b87940b5f541339eb49fa
        git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
        git fetch --no-tags dhowells-fs netfs-folio-regions
        git checkout 3ef8de77f6481b47212b87940b5f541339eb49fa
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 

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

All warnings (new ones prefixed by >>):

>> fs/netfs/write_helper.c:25:26: warning: comparison of distinct pointer types ('typeof (((1UL) << (12)) - offset) *' (aka 'unsigned long *') and 'typeof (size) *' (aka 'unsigned int *')) [-Wcompare-distinct-pointer-types]
                   unsigned int psize   = min(PAGE_SIZE - offset, size);
                                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:45:19: note: expanded from macro 'min'
   #define min(x, y)       __careful_cmp(x, y, <)
                           ^~~~~~~~~~~~~~~~~~~~~~
   include/linux/minmax.h:36:24: note: expanded from macro '__careful_cmp'
           __builtin_choose_expr(__safe_cmp(x, y), \
                                 ^~~~~~~~~~~~~~~~
   include/linux/minmax.h:26:4: note: expanded from macro '__safe_cmp'
                   (__typecheck(x, y) && __no_side_effects(x, y))
                    ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:20:28: note: expanded from macro '__typecheck'
           (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   1 warning generated.


vim +25 fs/netfs/write_helper.c

    15	
    16	static size_t copy_folio_from_iter_atomic(struct folio *folio,
    17						  unsigned int offset, size_t size,
    18						  struct iov_iter *i)
    19	{
    20		size_t copied = 0, n;
    21	
    22		do {
    23			unsigned int index   = offset / PAGE_SIZE;
    24			unsigned int poffset = offset % PAGE_SIZE;
  > 25			unsigned int psize   = min(PAGE_SIZE - offset, size);
    26	
    27			n = copy_page_from_iter_atomic(folio_file_page(folio, index),
    28						       poffset, psize, i);
    29			copied += n;
    30			if (n < psize)
    31				break;
    32			size -= n;
    33		} while (size);
    34		return copied;
    35	}
    36	

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

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