linux-kernel - [norov:bitmap 5/49] drivers/net/ethernet/qlogic/qed/qed_rdma.c:338:11: warning: comparison of distinct pointer types ('typeof (bmap->max_count - bit) *' (aka 'unsigned int *') and 'typeof (512) *' (aka 'int *'))

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Message-ID: <202203241543.fPNu5JUu-lkp@intel.com>
Date:   Thu, 24 Mar 2022 15:34:27 +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:bitmap 5/49]
 drivers/net/ethernet/qlogic/qed/qed_rdma.c:338:11: warning: comparison of
 distinct pointer types ('typeof (bmap->max_count - bit) *' (aka 'unsigned
 int *') and 'typeof (512) *' (aka 'int *'))

tree:   https://github.com/norov/linux bitmap
head:   d56897e7da0ce165cd3f983526a76013dd4c1bc1
commit: 4a18f9ef6b1ed1e87ca56f01d1f1a402809982e7 [5/49] qed: rework qed_rdma_bmap_free()
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20220324/202203241543.fPNu5JUu-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 902f4708fe1d03b0de7e5315ef875006a6adc319)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/norov/linux/commit/4a18f9ef6b1ed1e87ca56f01d1f1a402809982e7
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov bitmap
        git checkout 4a18f9ef6b1ed1e87ca56f01d1f1a402809982e7
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/i2c/busses/ drivers/net/ethernet/qlogic/qed/

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 >>):

>> drivers/net/ethernet/qlogic/qed/qed_rdma.c:338:11: warning: comparison of distinct pointer types ('typeof (bmap->max_count - bit) *' (aka 'unsigned int *') and 'typeof (512) *' (aka 'int *')) [-Wcompare-distinct-pointer-types]
                   nbits = min(bmap->max_count - bit, 512);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   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 +338 drivers/net/ethernet/qlogic/qed/qed_rdma.c

   318	
   319	void qed_rdma_bmap_free(struct qed_hwfn *p_hwfn,
   320				struct qed_bmap *bmap, bool check)
   321	{
   322		unsigned int bit, weight, nbits;
   323		unsigned long *b;
   324	
   325		if (!check)
   326			goto end;
   327	
   328		weight = bitmap_weight(bmap->bitmap, bmap->max_count);
   329		if (!weight)
   330			goto end;
   331	
   332		DP_NOTICE(p_hwfn,
   333			  "%s bitmap not free - size=%d, weight=%d, 512 bits per line\n",
   334			  bmap->name, bmap->max_count, weight);
   335	
   336		for (bit = 0; bit < bmap->max_count; bit += 512) {
   337			b =  bmap->bitmap + BITS_TO_LONGS(bit);
 > 338			nbits = min(bmap->max_count - bit, 512);
   339	
   340			if (!bitmap_empty(b, nbits))
   341				DP_NOTICE(p_hwfn,
   342					  "line 0x%04x: %*pb\n", bit / 512, nbits, b);
   343		}
   344	
   345	end:
   346		kfree(bmap->bitmap);
   347		bmap->bitmap = NULL;
   348	}
   349	

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