Re: [PATCH 07/13] huge_memory: Allow mappings of PUD sized pages

kernel test robot
2024-06-27T22:27:17Z

Hi Alistair,

kernel test robot noticed the following build errors:

[auto build test ERROR on f2661062f16b2de5d7b6a5c42a9a5c96326b8454]

url: https://github.com/intel-lab-lkp/linux/commits/Alistair-Popple/mm-gup-c-Remove-redundant-check-for-PCI-P2PDMA-page/20240627-191709
base: f2661062f16b2de5d7b6a5c42a9a5c96326b8454
patch link: https://lore.kernel.org/r/bd332b0d3971b03152b3541f97470817c5147b51.1719386613.git-series.apopple%40nvidia.com
patch subject: [PATCH 07/13] huge_memory: Allow mappings of PUD sized pages
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20240628/202406280637.147dyRrV-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240628/202406280637.147dyRrV-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/202406280637.147dyRrV-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/rmap.c:1513:37: error: call to '__compiletime_assert_279' declared with 'error' attribute: BUILD_BUG failed
1513 | __folio_add_file_rmap(folio, page, HPAGE_PUD_NR, vma, RMAP_LEVEL_PUD);
| ^
include/linux/huge_mm.h:111:26: note: expanded from macro 'HPAGE_PUD_NR'
111 | #define HPAGE_PUD_NR (1<<HPAGE_PUD_ORDER)
| ^
include/linux/huge_mm.h:110:26: note: expanded from macro 'HPAGE_PUD_ORDER'
110 | #define HPAGE_PUD_ORDER (HPAGE_PUD_SHIFT-PAGE_SHIFT)
| ^
include/linux/huge_mm.h:97:28: note: expanded from macro 'HPAGE_PUD_SHIFT'
97 | #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
| ^
note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:498:2: note: expanded from macro '_compiletime_assert'
498 | __compiletime_assert(condition, msg, prefix, suffix)
| ^
include/linux/compiler_types.h:491:4: note: expanded from macro '__compiletime_assert'
491 | prefix ## suffix(); \
| ^
<scratch space>:72:1: note: expanded from here
72 | __compiletime_assert_279
| ^
mm/rmap.c:1660:35: error: call to '__compiletime_assert_280' declared with 'error' attribute: BUILD_BUG failed
1660 | __folio_remove_rmap(folio, page, HPAGE_PUD_NR, vma, RMAP_LEVEL_PUD);
| ^
include/linux/huge_mm.h:111:26: note: expanded from macro 'HPAGE_PUD_NR'
111 | #define HPAGE_PUD_NR (1<<HPAGE_PUD_ORDER)
| ^
include/linux/huge_mm.h:110:26: note: expanded from macro 'HPAGE_PUD_ORDER'
110 | #define HPAGE_PUD_ORDER (HPAGE_PUD_SHIFT-PAGE_SHIFT)
| ^
include/linux/huge_mm.h:97:28: note: expanded from macro 'HPAGE_PUD_SHIFT'
97 | #define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
| ^
note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
include/linux/compiler_types.h:498:2: note: expanded from macro '_compiletime_assert'
498 | __compiletime_assert(condition, msg, prefix, suffix)
| ^
include/linux/compiler_types.h:491:4: note: expanded from macro '__compiletime_assert'
491 | prefix ## suffix(); \
| ^
<scratch space>:79:1: note: expanded from here
79 | __compiletime_assert_280
| ^
2 errors generated.

vim +1513 mm/rmap.c

1498
1499 /**
1500 * folio_add_file_rmap_pud - add a PUD mapping to a page range of a folio
1501 * @folio: The folio to add the mapping to
1502 * @page: The first page to add
1503 * @vma: The vm area in which the mapping is added
1504 *
1505 * The page range of the folio is defined by [page, page + HPAGE_PUD_NR)
1506 *
1507 * The caller needs to hold the page table lock.
1508 */
1509 void folio_add_file_rmap_pud(struct folio *folio, struct page *page,
1510 struct vm_area_struct *vma)
1511 {
1512 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
> 1513 __folio_add_file_rmap(folio, page, HPAGE_PUD_NR, vma, RMAP_LEVEL_PUD);
1514 #else
1515 WARN_ON_ONCE(true);
1516 #endif
1517 }
1518

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