linux-kernel - Re: [PATCH 2/3] hwmon: (occ) Remove sequence numbering and checksum calculation

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Message-ID: <202107190411.8vF4LQnA-lkp@intel.com>
Date:   Mon, 19 Jul 2021 04:08:14 +0800
From:   kernel test robot <lkp@...el.com>
To:     Eddie James <eajames@...ux.ibm.com>, linux-kernel@...r.kernel.org
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-hwmon@...r.kernel.org, linux-fsi@...ts.ozlabs.org,
        linux@...ck-us.net, jdelvare@...e.com, jk@...abs.org,
        joel@....id.au, alistair@...ple.id.au, openbmc@...ts.ozlabs.org,
        Eddie James <eajames@...ux.ibm.com>
Subject: Re: [PATCH 2/3] hwmon: (occ) Remove sequence numbering and checksum
 calculation

Hi Eddie,

I love your patch! Perhaps something to improve:

[auto build test WARNING on hwmon/hwmon-next]
[also build test WARNING on linux/master linus/master v5.14-rc1 next-20210716]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Eddie-James/OCC-fsi-and-hwmon-Set-sequence-number-in-submit-interface/20210718-103535
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: arm-randconfig-r033-20210718 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 5d5b08761f944d5b9822d582378333cc4b36a0a7)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/5e8ecc23325ef0310d83a4520071aae18418f88a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Eddie-James/OCC-fsi-and-hwmon-Set-sequence-number-in-submit-interface/20210718-103535
        git checkout 5e8ecc23325ef0310d83a4520071aae18418f88a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

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/hwmon/occ/p8_i2c.c:104:23: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (4UL) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
           memcpy(&data0, data, min(len, 4UL));
                                ^~~~~~~~~~~~~
   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)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   drivers/hwmon/occ/p8_i2c.c:107:28: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (4UL) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
                   memcpy(&data1, data + 4, min(len, 4UL));
                                            ^~~~~~~~~~~~~
   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)))
                      ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
   2 warnings generated.


vim +104 drivers/hwmon/occ/p8_i2c.c

    98	
    99	static int p8_i2c_occ_putscom_be(struct i2c_client *client, u32 address,
   100					 u8 *data, size_t len)
   101	{
   102		__be32 data0 = 0, data1 = 0;
   103	
 > 104		memcpy(&data0, data, min(len, 4UL));
   105		if (len > 4UL) {
   106			len -= 4;
   107			memcpy(&data1, data + 4, min(len, 4UL));
   108		}
   109	
   110		return p8_i2c_occ_putscom_u32(client, address, be32_to_cpu(data0),
   111					      be32_to_cpu(data1));
   112	}
   113	

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

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