[linux-next:master 10588/14131] drivers/block/loop.c:238:27: warning: result of comparison of constant 65536 with expression of type 'unsigned short' is always false

From: kbuild test robot <lkp@intel.com>
To: kbuild-all@lists.01.org
Subject: [linux-next:master 10588/14131] drivers/block/loop.c:238:27: warning: result of comparison of constant 65536 with expression of type 'unsigned short' is always false
Date: Tue, 02 Jun 2020 15:17:08 +0800	[thread overview]
Message-ID: <202006021505.b6TZ6Zjs%lkp@intel.com> (raw)

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   e7b08814b16b80a0bf76eeca16317f8c2ed23b8c
commit: 3448914e8cc550ba792d4ccc74471d1ca4293aae [10588/14131] loop: Add LOOP_CONFIGURE ioctl
config: mips-randconfig-r014-20200602 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2388a096e7865c043e83ece4e26654bd3d1a20d5)
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
        git checkout 3448914e8cc550ba792d4ccc74471d1ca4293aae
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

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

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/block/loop.c:238:27: warning: result of comparison of constant 65536 with expression of type 'unsigned short' is always false [-Wtautological-constant-out-of-range-compare]
if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
~~~~~ ^ ~~~~~~~~~
1 warning generated.

vim +238 drivers/block/loop.c

   230	
   231	/**
   232	 * loop_validate_block_size() - validates the passed in block size
   233	 * @bsize: size to validate
   234	 */
   235	static int
   236	loop_validate_block_size(unsigned short bsize)
   237	{
 > 238		if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
   239			return -EINVAL;
   240	
   241		return 0;
   242	}
   243	

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

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