Re: [PATCH v6 5/5] Drivers: hv: Add support for movable memory regions

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

Hi Stanislav,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.18-rc6]
[cannot apply to next-20251119]
[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/Stanislav-Kinsburskii/Drivers-hv-Refactor-and-rename-memory-region-handling-functions/20251118-010501
base:   linus/master
patch link:    https://lore.kernel.org/r/176339837995.27330.14240947043073674139.stgit%40skinsburskii-cloud-desktop.internal.cloudapp.net
patch subject: [PATCH v6 5/5] Drivers: hv: Add support for movable memory regions
config: x86_64-randconfig-076-20251119 (https://download.01.org/0day-ci/archive/20251120/202511200145.iDV1mUnj-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/20251120/202511200145.iDV1mUnj-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/202511200145.iDV1mUnj-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/vdso/const.h:5,
                    from include/linux/const.h:4,
                    from include/uapi/linux/kernel.h:6,
                    from include/linux/cache.h:5,
                    from arch/x86/include/asm/current.h:10,
                    from include/linux/sched.h:12,
                    from include/linux/resume_user_mode.h:6,
                    from include/linux/entry-virt.h:6,
                    from drivers/hv/mshv_root_main.c:11:
   In function 'mshv_region_handle_gfn_fault',
       inlined from 'mshv_handle_gpa_intercept' at drivers/hv/mshv_root_main.c:742:9,
       inlined from 'mshv_vp_handle_intercept' at drivers/hv/mshv_root_main.c:755:10,
       inlined from 'mshv_vp_ioctl_run_vp' at drivers/hv/mshv_root_main.c:769:22,
       inlined from 'mshv_vp_ioctl' at drivers/hv/mshv_root_main.c:958:7:
>> include/linux/compiler_types.h:602:45: error: call to '__compiletime_assert_1093' declared with attribute error: BUILD_BUG failed
     602 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/uapi/linux/const.h:49:44: note: in definition of macro '__ALIGN_KERNEL_MASK'
      49 | #define __ALIGN_KERNEL_MASK(x, mask)    (((x) + (mask)) & ~(mask))
         |                                            ^
   include/vdso/align.h:9:33: note: in expansion of macro '__ALIGN_KERNEL'
       9 | #define ALIGN_DOWN(x, a)        __ALIGN_KERNEL((x) - ((a) - 1), (a))
         |                                 ^~~~~~~~~~~~~~
   drivers/hv/mshv_root_main.c:691:23: note: in expansion of macro 'ALIGN_DOWN'
     691 |         page_offset = ALIGN_DOWN(gfn - region->start_gfn,
         |                       ^~~~~~~~~~
   include/linux/compiler_types.h:590:9: note: in expansion of macro '__compiletime_assert'
     590 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^~~~~~~~~~~~~~~~~~~~
   include/linux/compiler_types.h:602:9: note: in expansion of macro '_compiletime_assert'
     602 |         _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:59:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
         |                     ^~~~~~~~~~~~~~~~
   include/linux/huge_mm.h:113:28: note: in expansion of macro 'BUILD_BUG'
     113 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
         |                            ^~~~~~~~~
   include/linux/huge_mm.h:117:26: note: in expansion of macro 'HPAGE_PMD_SHIFT'
     117 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
         |                          ^~~~~~~~~~~~~~~
   include/linux/huge_mm.h:118:26: note: in expansion of macro 'HPAGE_PMD_ORDER'
     118 | #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
         |                          ^~~~~~~~~~~~~~~
   drivers/hv/mshv_root_main.c:40:49: note: in expansion of macro 'HPAGE_PMD_NR'
      40 | #define MSHV_MAP_FAULT_IN_PAGES                 HPAGE_PMD_NR
         |                                                 ^~~~~~~~~~~~
   drivers/hv/mshv_root_main.c:692:34: note: in expansion of macro 'MSHV_MAP_FAULT_IN_PAGES'
     692 |                                  MSHV_MAP_FAULT_IN_PAGES);
         |                                  ^~~~~~~~~~~~~~~~~~~~~~~


vim +/__compiletime_assert_1093 +602 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  588  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  589  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  590  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  591  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  592  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  593   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  594   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  595   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  596   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  597   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  598   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  599   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  600   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  601  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @602  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  603  

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