Re: [PATCH v13 14/20] KVM: x86: Enable guest_memfd mmap for default VM type

[kernel test robot <lkp@intel.com>]

Hi Fuad,

kernel test robot noticed the following build errors:

[auto build test ERROR on d7b8f8e20813f0179d8ef519541a3527e7661d3a]

url:    https://github.com/intel-lab-lkp/linux/commits/Fuad-Tabba/KVM-Rename-CONFIG_KVM_PRIVATE_MEM-to-CONFIG_KVM_GMEM/20250709-190344
base:   d7b8f8e20813f0179d8ef519541a3527e7661d3a
patch link:    https://lore.kernel.org/r/20250709105946.4009897-15-tabba%40google.com
patch subject: [PATCH v13 14/20] KVM: x86: Enable guest_memfd mmap for default VM type
config: i386-randconfig-013-20250711 (https://download.01.org/0day-ci/archive/20250711/202507110822.EaBBAGre-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250711/202507110822.EaBBAGre-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507110822.EaBBAGre-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/x86/kvm/../../../virt/kvm/guest_memfd.c: In function 'kvm_gmem_supports_mmap':
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:317:27: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     317 |         const u64 flags = (u64)inode->i_private;
         |                           ^
   In file included from <command-line>:
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c: In function 'kvm_gmem_bind':
>> include/linux/compiler_types.h:568:45: error: call to '__compiletime_assert_624' declared with attribute error: BUILD_BUG_ON failed: sizeof(gfn_t) != sizeof(slot->gmem.pgoff)
     568 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:549:25: note: in definition of macro '__compiletime_assert'
     549 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:568:9: note: in expansion of macro '_compiletime_assert'
     568 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   arch/x86/kvm/../../../virt/kvm/guest_memfd.c:558:9: note: in expansion of macro 'BUILD_BUG_ON'
     558 |         BUILD_BUG_ON(sizeof(gfn_t) != sizeof(slot->gmem.pgoff));
         |         ^~~~~~~~~~~~


vim +/__compiletime_assert_624 +568 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  554  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  555  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  556  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  557  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  558  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  559   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  560   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  561   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  562   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  563   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  564   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  565   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  566   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  567  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @568  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  569  

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