Re: [PATCH 24/45] KVM: Introduce a generation number for memory attributes

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

Hi Paolo,

kernel test robot noticed the following build errors:

[auto build test ERROR on kvm/queue]
[also build test ERROR on kvm/next linus/master next-20261030]
[cannot apply to mst-vhost/linux-next kvm/linux-next v7.3]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Paolo-Bonzini/KVM-nVMX-nSVM-check-unconditionally-whether-CR3-is-valid/20261102-124045
base:   https://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
patch link:    https://lore.kernel.org/r/20261102174512.8903-8-pbonzini%40redhat.com
patch subject: [PATCH 24/45] KVM: Introduce a generation number for memory attributes
config: i386-randconfig-1010-20261103 (https://download.01.org/0day-ci/archive/20261103/202611032129.t2hEI0s4-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261103/202611032129.t2hEI0s4-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/202611032129.t2hEI0s4-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   include/linux/kvm_host.h: In function 'kvm_mem_attributes_generation.isra':
>> include/linux/compiler_types.h:702:45: error: call to '__compiletime_assert_523' declared with attribute error: Need native word sized stores/loads for atomicity.
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:683:25: note: in definition of macro '__compiletime_assert'
     683 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:705:9: note: in expansion of macro 'compiletime_assert'
     705 |         compiletime_assert(__native_word(t),                            \
         |         ^~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/barrier.h:69:9: note: in expansion of macro 'compiletime_assert_atomic_type'
      69 |         compiletime_assert_atomic_type(*p);                             \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/barrier.h:176:29: note: in expansion of macro '__smp_load_acquire'
     176 | #define smp_load_acquire(p) __smp_load_acquire(p)
         |                             ^~~~~~~~~~~~~~~~~~
   include/linux/kvm_host.h:2640:16: note: in expansion of macro 'smp_load_acquire'
    2640 |         return smp_load_acquire(&kvm->mem_attrs.generation);
         |                ^~~~~~~~~~~~~~~~
--
   In file included from <command-line>:
   include/linux/kvm_host.h: In function 'kvm_mem_attributes_generation.isra':
>> include/linux/compiler_types.h:702:45: error: call to '__compiletime_assert_523' declared with attribute error: Need native word sized stores/loads for atomicity.
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:683:25: note: in definition of macro '__compiletime_assert'
     683 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:705:9: note: in expansion of macro 'compiletime_assert'
     705 |         compiletime_assert(__native_word(t),                            \
         |         ^~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/barrier.h:69:9: note: in expansion of macro 'compiletime_assert_atomic_type'
      69 |         compiletime_assert_atomic_type(*p);                             \
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/barrier.h:176:29: note: in expansion of macro '__smp_load_acquire'
     176 | #define smp_load_acquire(p) __smp_load_acquire(p)
         |                             ^~~~~~~~~~~~~~~~~~
   include/linux/kvm_host.h:2640:16: note: in expansion of macro 'smp_load_acquire'
    2640 |         return smp_load_acquire(&kvm->mem_attrs.generation);
         |                ^~~~~~~~~~~~~~~~
   In function 'kvm_vm_ioctl_set_mem_attributes',
       inlined from 'kvm_vm_ioctl' at arch/x86/kvm/../../../virt/kvm/kvm_main.c:5624:7:
   include/linux/compiler_types.h:702:45: error: call to '__compiletime_assert_804' declared with attribute error: BUILD_BUG_ON failed: sizeof(attrs->attributes) != sizeof(unsigned long)
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:683:25: note: in definition of macro '__compiletime_assert'
     683 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:702:9: note: in expansion of macro '_compiletime_assert'
     702 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:40:37: note: in expansion of macro 'compiletime_assert'
      40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:51:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      51 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   arch/x86/kvm/../../../virt/kvm/kvm_main.c:2795:9: note: in expansion of macro 'BUILD_BUG_ON'
    2795 |         BUILD_BUG_ON(sizeof(attrs->attributes) != sizeof(unsigned long));
         |         ^~~~~~~~~~~~


vim +/__compiletime_assert_523 +702 include/linux/compiler_types.h

eb5c2d4b45e3d2d Will Deacon 2020-07-21  688  
eb5c2d4b45e3d2d Will Deacon 2020-07-21  689  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21  690  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2d Will Deacon 2020-07-21  691  
eb5c2d4b45e3d2d Will Deacon 2020-07-21  692  /**
eb5c2d4b45e3d2d Will Deacon 2020-07-21  693   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21  694   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2d Will Deacon 2020-07-21  695   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21  696   *
eb5c2d4b45e3d2d Will Deacon 2020-07-21  697   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21  698   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21  699   * compiler has support to do so.
eb5c2d4b45e3d2d Will Deacon 2020-07-21  700   */
eb5c2d4b45e3d2d Will Deacon 2020-07-21  701  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21 @702  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2d Will Deacon 2020-07-21  703  

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki