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

From: kernel test robot <[email-masked]>
Date: Fri, 28 Jun 2024 06:26:36 +0800

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/[email-masked]/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/[email-masked]/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 <[email-masked]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email-masked]/

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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