[alexshi:mmunstable2 25/25] mm/memory.c:448:12: error: incompatible pointer types initializing 'pgtable_t' (aka 'struct page *') with an expression of type 'typeof (pte_alloc_one_noprof(mm))' (aka 'struct ptdesc *')

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

tree:   https://github.com/alexshi/linux.git mmunstable2
head:   0cbc69cf7dfd23eaec0cd316463493ac0dbdbbb9
commit: 0cbc69cf7dfd23eaec0cd316463493ac0dbdbbb9 [25/25] pgtable: return ptdesc in pte_alloc_one series functions
config: um-allnoconfig (https://download.01.org/0day-ci/archive/20240719/202407192006.ZPbNi38F-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240719/202407192006.ZPbNi38F-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/202407192006.ZPbNi38F-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/memory.c:43:
   In file included from include/linux/kernel_stat.h:9:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/um/include/asm/hardirq.h:5:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:14:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:548:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     548 |         val = __raw_readb(PCI_IOBASE + addr);
         |                           ~~~~~~~~~~ ^
   include/asm-generic/io.h:561:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     561 |         val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   In file included from mm/memory.c:43:
   In file included from include/linux/kernel_stat.h:9:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/um/include/asm/hardirq.h:5:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:14:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:574:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     574 |         val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
         |                                                         ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
      35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
         |                                                   ^
   In file included from mm/memory.c:43:
   In file included from include/linux/kernel_stat.h:9:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/um/include/asm/hardirq.h:5:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:14:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:585:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     585 |         __raw_writeb(value, PCI_IOBASE + addr);
         |                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:595:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     595 |         __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:605:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     605 |         __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
         |                                                       ~~~~~~~~~~ ^
   include/asm-generic/io.h:693:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     693 |         readsb(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:701:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     701 |         readsw(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:709:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     709 |         readsl(PCI_IOBASE + addr, buffer, count);
         |                ~~~~~~~~~~ ^
   include/asm-generic/io.h:718:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     718 |         writesb(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
   include/asm-generic/io.h:727:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     727 |         writesw(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
   include/asm-generic/io.h:736:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
     736 |         writesl(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
>> mm/memory.c:448:12: error: incompatible pointer types initializing 'pgtable_t' (aka 'struct page *') with an expression of type 'typeof (pte_alloc_one_noprof(mm))' (aka 'struct ptdesc *') [-Werror,-Wincompatible-pointer-types]
     448 |         pgtable_t new = pte_alloc_one(mm);
         |                   ^     ~~~~~~~~~~~~~~~~~
>> mm/memory.c:4650:21: error: incompatible pointer types assigning to 'pgtable_t' (aka 'struct page *') from 'typeof (pte_alloc_one_noprof(vma->vm_mm))' (aka 'struct ptdesc *') [-Werror,-Wincompatible-pointer-types]
    4650 |                 vmf->prealloc_pte = pte_alloc_one(vma->vm_mm);
         |                                   ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
>> mm/memory.c:5013:21: error: incompatible pointer types assigning to 'pgtable_t' (aka 'struct page *') from 'typeof (pte_alloc_one_noprof(vmf->vma->vm_mm))' (aka 'struct ptdesc *') [-Werror,-Wincompatible-pointer-types]
    5013 |                 vmf->prealloc_pte = pte_alloc_one(vmf->vma->vm_mm);
         |                                   ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   12 warnings and 3 errors generated.


vim +448 mm/memory.c

ed33b5a677da33 Qi Zheng           2021-11-05  445  
ed33b5a677da33 Qi Zheng           2021-11-05  446  int __pte_alloc(struct mm_struct *mm, pmd_t *pmd)
ed33b5a677da33 Qi Zheng           2021-11-05  447  {
ed33b5a677da33 Qi Zheng           2021-11-05 @448  	pgtable_t new = pte_alloc_one(mm);
ed33b5a677da33 Qi Zheng           2021-11-05  449  	if (!new)
ed33b5a677da33 Qi Zheng           2021-11-05  450  		return -ENOMEM;
362a61ad61199e Nicholas Piggin    2008-05-14  451  
03c4f20454e023 Qi Zheng           2021-11-05  452  	pmd_install(mm, pmd, &new);
2f569afd9ced9e Martin Schwidefsky 2008-02-08  453  	if (new)
2f569afd9ced9e Martin Schwidefsky 2008-02-08  454  		pte_free(mm, new);
1bb3630e89cb8a Hugh Dickins       2005-10-29  455  	return 0;
^1da177e4c3f41 Linus Torvalds     2005-04-16  456  }
^1da177e4c3f41 Linus Torvalds     2005-04-16  457  

:::::: The code at line 448 was first introduced by commit
:::::: ed33b5a677da33d6e8f959879bb61e9791b80354 mm: remove redundant smp_wmb()

:::::: TO: Qi Zheng <zhengqi.arch@bytedance.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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