linux-kernel - [jlayton:ceph-fscrypt 53/54] net/ceph/messenger.c:1122:16: warning: comparison of distinct pointer types ('typeof (bytes) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *'))

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Date:   Tue, 1 Feb 2022 12:37:56 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [jlayton:ceph-fscrypt 53/54] net/ceph/messenger.c:1122:16: warning:
 comparison of distinct pointer types ('typeof (bytes) *' (aka 'unsigned int
 *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *'))

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git ceph-fscrypt
head:   14cb86455b249f05d1b11dbab353e33f4fad6a5a
commit: 7e935aa6d4c23a6bcbd27a28c4f5457885c9ae98 [53/54] libceph: allow ceph_msg_data_advance to advance more than a page
config: i386-randconfig-r013-20220131 (https://download.01.org/0day-ci/archive/20220201/202202011252.GlKY0IdE-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6b1e844b69f15bb7dffaf9365cd2b355d2eb7579)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git/commit/?id=7e935aa6d4c23a6bcbd27a28c4f5457885c9ae98
        git remote add jlayton https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git
        git fetch --no-tags jlayton ceph-fscrypt
        git checkout 7e935aa6d4c23a6bcbd27a28c4f5457885c9ae98
        # 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=i386 SHELL=/bin/bash net/ceph/

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 >>):

>> net/ceph/messenger.c:1122:16: warning: comparison of distinct pointer types ('typeof (bytes) *' (aka 'unsigned int *') and 'typeof (((1UL) << 12)) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
                   size_t cur = min(bytes, PAGE_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 +1122 net/ceph/messenger.c

  1118	
  1119	void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, size_t bytes)
  1120	{
  1121		while (bytes) {
> 1122			size_t cur = min(bytes, PAGE_SIZE);
  1123	
  1124			__ceph_msg_data_advance(cursor, cur);
  1125			bytes -= cur;
  1126		}
  1127	}
  1128	

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