Re: [PATCH] mm/page_vma_mapped: revalidate and do proper check before return device-private pmd

[Wei Yang <richard.weiyang@gmail.com>]

On Wed, Jun 24, 2026 at 12:18:20AM +0800, kernel test robot wrote:
>Hi Wei,
>
>kernel test robot noticed the following build errors:
>

Thanks for reporting.

>[auto build test ERROR on akpm-mm/mm-everything]
>
>url:    https://github.com/intel-lab-lkp/linux/commits/Wei-Yang/mm-page_vma_mapped-revalidate-and-do-proper-check-before-return-device-private-pmd/20260623-012838
>base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
>patch link:    https://lore.kernel.org/r/20260622130651.23359-1-richard.weiyang%40gmail.com
>patch subject: [PATCH] mm/page_vma_mapped: revalidate and do proper check before return device-private pmd
>config: parisc-randconfig-002-20260623 (https://download.01.org/0day-ci/archive/20260624/202606240042.ffPsEXVc-lkp@intel.com/config)

So this is parisc arch.

In the config file, HAVE_ARCH_TRANSPARENT_HUGEPAGE is not defined. Which leads
to !TRANSPARENT_HUGEPAGE and !PGTABLE_HAS_HUGE_LEAVES.

And then trigger the BUILD_BUG().

>compiler: hppa-linux-gcc (GCC) 8.5.0
>reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260624/202606240042.ffPsEXVc-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/202606240042.ffPsEXVc-lkp@intel.com/
>
>All errors (new ones prefixed by >>):
>
>   In file included from <command-line>:
>   In function 'check_pmd.isra.24',
>       inlined from 'page_vma_mapped_walk' at mm/page_vma_mapped.c:283:11:
>>> include/linux/compiler_types.h:699:38: error: call to '__compiletime_assert_406' declared with attribute error: BUILD_BUG failed
>     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>                                         ^
>   include/linux/compiler_types.h:680:4: note: in definition of macro '__compiletime_assert'
>       prefix ## suffix();    \
>       ^~~~~~
>   include/linux/compiler_types.h:699:2: note: in expansion of macro '_compiletime_assert'
>     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>     ^~~~~~~~~~~~~~~~~~~
>   include/linux/build_bug.h:40:37: note: in expansion of macro 'compiletime_assert'
>    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>                                        ^~~~~~~~~~~~~~~~~~
>   include/linux/build_bug.h:60:21: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>    #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'
>    #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
>                               ^~~~~~~~~
>   include/linux/huge_mm.h:117:26: note: in expansion of macro 'HPAGE_PMD_SHIFT'
>    #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
>                             ^~~~~~~~~~~~~~~
>   include/linux/huge_mm.h:118:26: note: in expansion of macro 'HPAGE_PMD_ORDER'
>    #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
>                             ^~~~~~~~~~~~~~~
>   mm/page_vma_mapped.c:142:13: note: in expansion of macro 'HPAGE_PMD_NR'
>     if ((pfn + HPAGE_PMD_NR - 1) < pvmw->pfn)
>                ^~~~~~~~~~~~
>

This is in definition of check_pmd() which is already in kernel for a while.

I will update current version, and take a look to how to fix it.

>
>vim +/__compiletime_assert_406 +699 include/linux/compiler_types.h
>
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  685  
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  686  #define _compiletime_assert(condition, msg, prefix, suffix) \
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  687  	__compiletime_assert(condition, msg, prefix, suffix)
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  688  
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  689  /**
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  690   * compiletime_assert - break build and emit msg if condition is false
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  691   * @condition: a compile-time constant condition to check
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  692   * @msg:       a message to emit if condition is false
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  693   *
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  694   * In tradition of POSIX assert, this macro will break the build if the
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  695   * supplied condition is *false*, emitting the supplied error message if the
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  696   * compiler has support to do so.
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  697   */
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  698  #define compiletime_assert(condition, msg) \
>eb5c2d4b45e3d2d Will Deacon 2020-07-21 @699  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>eb5c2d4b45e3d2d Will Deacon 2020-07-21  700  
>
>--
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-- 
Wei Yang
Help you, Help me