[davidhildenbrand:folded_pgtable 28/32] arch/x86/mm/pgtable.c:434:3: error: call to '__compiletime_assert_476' declared with 'error' attribute: BUILD_BUG failed

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

:::::: 
:::::: Manual check reason: "__compiletime_assert_NNN"
:::::: 

BCC: lkp@intel.com
CC: llvm@lists.linux.dev
CC: oe-kbuild-all@lists.linux.dev
TO: "David Hildenbrand (Arm)" <david@kernel.org>

tree:   https://github.com/davidhildenbrand/linux folded_pgtable
head:   0551ca68b7552b7d71f1d2882635809a573d6c79
commit: 4d449742015c33fd18a4aebf1ee795675c2b532f [28/32] mm/pgtable: disallow calling folded set_pgd/set_p4d/set_pud
:::::: branch date: 22 hours ago
:::::: commit date: 22 hours ago
config: i386-randconfig-003-20260709 (https://download.01.org/0day-ci/archive/20260709/202607092357.lOkBrapn-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260709/202607092357.lOkBrapn-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/r/202607092357.lOkBrapn-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/mm/pgtable.c:434:3: error: call to '__compiletime_assert_476' declared with 'error' attribute: BUILD_BUG failed
     434 |                 set_pud(pudp, entry);
         |                 ^
   include/asm-generic/pgtable-nopmd.h:41:35: note: expanded from macro 'set_pud'
      41 | #define set_pud(pudptr, pudval)                 BUILD_BUG()
         |                                                 ^
   include/linux/build_bug.h:60:21: note: expanded from macro 'BUILD_BUG'
      60 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
         |                     ^
   include/linux/build_bug.h:40:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
      40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^
   note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:690:2: note: expanded from macro '_compiletime_assert'
     690 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^
   include/linux/compiler_types.h:683:4: note: expanded from macro '__compiletime_assert'
     683 |                         prefix ## suffix();                             \
         |                         ^
   <scratch space>:231:1: note: expanded from here
     231 | __compiletime_assert_476
         | ^
   1 error generated.
--
   arch/x86/platform/olpc/olpc_ofw.c:26:16: warning: variable 'ofw_pde' set but not used [-Wunused-but-set-variable]
      26 |         pgd_t *base, *ofw_pde;
         |                       ^
>> arch/x86/platform/olpc/olpc_ofw.c:41:2: error: call to '__compiletime_assert_133' declared with 'error' attribute: BUILD_BUG failed
      41 |         set_pgd(&swapper_pg_dir[OLPC_OFW_PDE_NR], *ofw_pde);
         |         ^
   include/asm-generic/pgtable-nop4d.h:32:35: note: expanded from macro 'set_pgd'
      32 | #define set_pgd(pgdptr, pgdval)                 BUILD_BUG()
         |                                                 ^
   include/linux/build_bug.h:60:21: note: expanded from macro 'BUILD_BUG'
      60 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
         |                     ^
   include/linux/build_bug.h:40:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
      40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^
   note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:690:2: note: expanded from macro '_compiletime_assert'
     690 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^
   include/linux/compiler_types.h:683:4: note: expanded from macro '__compiletime_assert'
     683 |                         prefix ## suffix();                             \
         |                         ^
   <scratch space>:194:1: note: expanded from here
     194 | __compiletime_assert_133
         | ^
   1 warning and 1 error generated.


vim +434 arch/x86/mm/pgtable.c

a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  425  
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  426  int pudp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  427  			  pud_t *pudp, pud_t entry, int dirty)
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  428  {
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  429  	int changed = !pud_same(*pudp, entry);
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  430  
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  431  	VM_BUG_ON(address & ~HPAGE_PUD_MASK);
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  432  
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  433  	if (changed && dirty) {
9bc4f28af75a91a Nadav Amit       2018-09-02 @434  		set_pud(pudp, entry);
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  435  		/*
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  436  		 * We had a write-protection fault here and changed the pud
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  437  		 * to to more permissive. No need to flush the TLB for that,
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  438  		 * #PF is architecturally guaranteed to do that and in the
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  439  		 * worst-case we'll generate a spurious fault.
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  440  		 */
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  441  	}
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  442  
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  443  	return changed;
a00cc7d9dd93d66 Matthew Wilcox   2017-02-24  444  }
db3eb96f4e6281b Andrea Arcangeli 2011-01-13  445  #endif
db3eb96f4e6281b Andrea Arcangeli 2011-01-13  446  

:::::: The code at line 434 was first introduced by commit
:::::: 9bc4f28af75a91aea0ae383f50b0a430c4509303 x86/mm: Use WRITE_ONCE() when setting PTEs

:::::: TO: Nadav Amit <namit@vmware.com>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>

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