linux-kernel - [intel-tdx:guest 72/127] include/linux/mman.h:158:9: error: division by zero is undefined

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Date:   Thu, 2 Sep 2021 18:07:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [intel-tdx:guest 72/127] include/linux/mman.h:158:9: error: division
 by zero is undefined

tree:   https://github.com/intel/tdx.git guest
head:   c748712bd17bbd7f8a75553911a5557f3d7d32b2
commit: 9776cd53b86f83859c1f974a9cfff54d08e81f46 [72/127] x86/tdx: Add device filter support for x86 TDX guest platform
config: i386-randconfig-r005-20210901 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4b1fde8a2b681dad2ce0c082a5d6422caa06b0bc)
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://github.com/intel/tdx/commit/9776cd53b86f83859c1f974a9cfff54d08e81f46
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx guest
        git checkout 9776cd53b86f83859c1f974a9cfff54d08e81f46
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 

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

All errors (new ones prefixed by >>):

   In file included from arch/x86/kvm/../../../virt/kvm/kvm_main.c:18:
   In file included from include/linux/kvm_host.h:35:
   In file included from include/linux/kvm_para.h:5:
   In file included from include/uapi/linux/kvm_para.h:37:
   In file included from arch/x86/include/asm/kvm_para.h:7:
   arch/x86/include/asm/tdx.h:175:12: error: incomplete definition of type 'struct device'
           return dev->authorized;
                  ~~~^
   include/linux/dynamic_debug.h:70:8: note: forward declaration of 'struct device'
   struct device;
          ^
   In file included from arch/x86/kvm/../../../virt/kvm/kvm_main.c:41:
>> include/linux/mman.h:158:9: error: division by zero is undefined [-Werror,-Wdivision-by-zero]
                  _calc_vm_trans(flags, MAP_SYNC,       VM_SYNC      ) |
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/mman.h:135:21: note: expanded from macro '_calc_vm_trans'
      : ((x) & (bit1)) / ((bit1) / (bit2))))
                       ^ ~~~~~~~~~~~~~~~~~
   2 errors generated.


vim +158 include/linux/mman.h

^1da177e4c3f41 Linus Torvalds  2005-04-16  148  
^1da177e4c3f41 Linus Torvalds  2005-04-16  149  /*
^1da177e4c3f41 Linus Torvalds  2005-04-16  150   * Combine the mmap "flags" argument into "vm_flags" used internally.
^1da177e4c3f41 Linus Torvalds  2005-04-16  151   */
^1da177e4c3f41 Linus Torvalds  2005-04-16  152  static inline unsigned long
^1da177e4c3f41 Linus Torvalds  2005-04-16  153  calc_vm_flag_bits(unsigned long flags)
^1da177e4c3f41 Linus Torvalds  2005-04-16  154  {
^1da177e4c3f41 Linus Torvalds  2005-04-16  155  	return _calc_vm_trans(flags, MAP_GROWSDOWN,  VM_GROWSDOWN ) |
^1da177e4c3f41 Linus Torvalds  2005-04-16  156  	       _calc_vm_trans(flags, MAP_DENYWRITE,  VM_DENYWRITE ) |
b6fb293f2497a9 Jan Kara        2017-11-01  157  	       _calc_vm_trans(flags, MAP_LOCKED,     VM_LOCKED    ) |
b3fbbea4c00220 Kevin Brodsky   2019-11-25 @158  	       _calc_vm_trans(flags, MAP_SYNC,	     VM_SYNC      ) |
b3fbbea4c00220 Kevin Brodsky   2019-11-25  159  	       arch_calc_vm_flag_bits(flags);
^1da177e4c3f41 Linus Torvalds  2005-04-16  160  }
00619bcc44d6b7 Jerome Marchand 2013-11-12  161  

:::::: The code at line 158 was first introduced by commit
:::::: b3fbbea4c00220f62e6f7e2514466e6ee81f7f60 mm: Introduce arch_calc_vm_flag_bits()

:::::: TO: Kevin Brodsky <Kevin.Brodsky@....com>
:::::: CC: Catalin Marinas <catalin.marinas@....com>

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

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