tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   c5db92909beddadddb705b92d3388ea50b01e1a2
commit: 3811ca601dde25d594f2c724af45238b53dacdc3 [14415/14429] m68k: mm: use pgtable-nopXd instead of 4level-fixup
config: m68k-m5475evb_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 7.5.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 3811ca601dde25d594f2c724af45238b53dacdc3
        # save the attached .config to linux build tree
        GCC_VERSION=7.5.0 make.cross ARCH=m68k 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arch/m68k/mm/kmap.c: In function '__free_io_area':
   arch/m68k/mm/kmap.c:76:24: error: passing argument 1 of 'pmd_offset' from incompatible pointer type [-Werror=incompatible-pointer-types]
      pmd_dir = pmd_offset(pgd_dir, virtaddr);
                           ^~~~~~~
   In file included from arch/m68k/include/asm/pgtable_mm.h:7:0,
                    from arch/m68k/include/asm/pgtable.h:5,
                    from include/linux/mm.h:99,
                    from arch/m68k/mm/kmap.c:12:
   include/asm-generic/pgtable-nopmd.h:44:23: note: expected 'pud_t * {aka struct <anonymous> *}' but argument is of type 'pgd_t * {aka struct <anonymous> *}'
    static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
                          ^~~~~~~~~~
>> arch/m68k/mm/kmap.c:80:28: error: 'pmd_t {aka struct <anonymous>}' has no member named 'pmd'; did you mean 'pud'?
       int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
                               ^~~
                               pud
   arch/m68k/mm/kmap.c:83:14: error: 'pmd_t {aka struct <anonymous>}' has no member named 'pmd'; did you mean 'pud'?
        pmd_dir->pmd[pmd_off] = 0;
                 ^~~
                 pud
   arch/m68k/mm/kmap.c: In function 'kernel_set_cachemode':
   arch/m68k/mm/kmap.c:348:2: error: #endif without #if
    #endif
     ^~~~~
   arch/m68k/mm/kmap.c:352:3: error: 'p4d_dir' undeclared (first use in this function); did you mean 'pmd_dir'?
      p4d_dir = p4d_offset(pgd_dir, virtaddr);
      ^~~~~~~
      pmd_dir
   arch/m68k/mm/kmap.c:352:3: note: each undeclared identifier is reported only once for each function it appears in
   arch/m68k/mm/kmap.c:353:3: error: 'pud_dir' undeclared (first use in this function); did you mean 'p4d_dir'?
      pud_dir = pud_offset(p4d_dir, virtaddr);
      ^~~~~~~
      p4d_dir
   cc1: some warnings being treated as errors

vim +80 arch/m68k/mm/kmap.c

1bccc43c1010f2 Greg Ungerer       2011-03-28  @12  #include <linux/mm.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   13  #include <linux/kernel.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   14  #include <linux/string.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   15  #include <linux/types.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   16  #include <linux/slab.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   17  #include <linux/vmalloc.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   18  
1bccc43c1010f2 Greg Ungerer       2011-03-28   19  #include <asm/setup.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   20  #include <asm/segment.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   21  #include <asm/page.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   22  #include <asm/pgalloc.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   23  #include <asm/io.h>
1bccc43c1010f2 Greg Ungerer       2011-03-28   24  
1bccc43c1010f2 Greg Ungerer       2011-03-28   25  #undef DEBUG
1bccc43c1010f2 Greg Ungerer       2011-03-28   26  
1bccc43c1010f2 Greg Ungerer       2011-03-28   27  #define PTRTREESIZE	(256*1024)
1bccc43c1010f2 Greg Ungerer       2011-03-28   28  
1bccc43c1010f2 Greg Ungerer       2011-03-28   29  /*
1bccc43c1010f2 Greg Ungerer       2011-03-28   30   * For 040/060 we can use the virtual memory area like other architectures,
f6fc30dbb720e3 Geert Uytterhoeven 2013-12-17   31   * but for 020/030 we want to use early termination page descriptors and we
1bccc43c1010f2 Greg Ungerer       2011-03-28   32   * can't mix this with normal page descriptors, so we have to copy that code
f6fc30dbb720e3 Geert Uytterhoeven 2013-12-17   33   * (mm/vmalloc.c) and return appropriately aligned addresses.
1bccc43c1010f2 Greg Ungerer       2011-03-28   34   */
1bccc43c1010f2 Greg Ungerer       2011-03-28   35  
1bccc43c1010f2 Greg Ungerer       2011-03-28   36  #ifdef CPU_M68040_OR_M68060_ONLY
1bccc43c1010f2 Greg Ungerer       2011-03-28   37  
1bccc43c1010f2 Greg Ungerer       2011-03-28   38  #define IO_SIZE		PAGE_SIZE
1bccc43c1010f2 Greg Ungerer       2011-03-28   39  
1bccc43c1010f2 Greg Ungerer       2011-03-28   40  static inline struct vm_struct *get_io_area(unsigned long size)
1bccc43c1010f2 Greg Ungerer       2011-03-28   41  {
1bccc43c1010f2 Greg Ungerer       2011-03-28   42  	return get_vm_area(size, VM_IOREMAP);
1bccc43c1010f2 Greg Ungerer       2011-03-28   43  }
1bccc43c1010f2 Greg Ungerer       2011-03-28   44  
1bccc43c1010f2 Greg Ungerer       2011-03-28   45  
1bccc43c1010f2 Greg Ungerer       2011-03-28   46  static inline void free_io_area(void *addr)
1bccc43c1010f2 Greg Ungerer       2011-03-28   47  {
1bccc43c1010f2 Greg Ungerer       2011-03-28   48  	vfree((void *)(PAGE_MASK & (unsigned long)addr));
1bccc43c1010f2 Greg Ungerer       2011-03-28   49  }
1bccc43c1010f2 Greg Ungerer       2011-03-28   50  
^1da177e4c3f41 Linus Torvalds     2005-04-16   51  #else
1bccc43c1010f2 Greg Ungerer       2011-03-28   52  
1bccc43c1010f2 Greg Ungerer       2011-03-28   53  #define IO_SIZE		(256*1024)
1bccc43c1010f2 Greg Ungerer       2011-03-28   54  
1bccc43c1010f2 Greg Ungerer       2011-03-28   55  static struct vm_struct *iolist;
1bccc43c1010f2 Greg Ungerer       2011-03-28   56  
076863473c0cdb Christoph Hellwig  2019-08-13   57  /*
076863473c0cdb Christoph Hellwig  2019-08-13   58   * __free_io_area unmaps nearly everything, so be careful
076863473c0cdb Christoph Hellwig  2019-08-13   59   * Currently it doesn't free pointer/page tables anymore but this
076863473c0cdb Christoph Hellwig  2019-08-13   60   * wasn't used anyway and might be added later.
076863473c0cdb Christoph Hellwig  2019-08-13   61   */
076863473c0cdb Christoph Hellwig  2019-08-13   62  static void __free_io_area(void *addr, unsigned long size)
076863473c0cdb Christoph Hellwig  2019-08-13   63  {
076863473c0cdb Christoph Hellwig  2019-08-13   64  	unsigned long virtaddr = (unsigned long)addr;
076863473c0cdb Christoph Hellwig  2019-08-13   65  	pgd_t *pgd_dir;
076863473c0cdb Christoph Hellwig  2019-08-13   66  	pmd_t *pmd_dir;
076863473c0cdb Christoph Hellwig  2019-08-13   67  	pte_t *pte_dir;
076863473c0cdb Christoph Hellwig  2019-08-13   68  
076863473c0cdb Christoph Hellwig  2019-08-13   69  	while ((long)size > 0) {
076863473c0cdb Christoph Hellwig  2019-08-13   70  		pgd_dir = pgd_offset_k(virtaddr);
076863473c0cdb Christoph Hellwig  2019-08-13   71  		if (pgd_bad(*pgd_dir)) {
076863473c0cdb Christoph Hellwig  2019-08-13   72  			printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
076863473c0cdb Christoph Hellwig  2019-08-13   73  			pgd_clear(pgd_dir);
076863473c0cdb Christoph Hellwig  2019-08-13   74  			return;
076863473c0cdb Christoph Hellwig  2019-08-13   75  		}
076863473c0cdb Christoph Hellwig  2019-08-13   76  		pmd_dir = pmd_offset(pgd_dir, virtaddr);
076863473c0cdb Christoph Hellwig  2019-08-13   77  
076863473c0cdb Christoph Hellwig  2019-08-13   78  		if (CPU_IS_020_OR_030) {
076863473c0cdb Christoph Hellwig  2019-08-13   79  			int pmd_off = (virtaddr/PTRTREESIZE) & 15;
076863473c0cdb Christoph Hellwig  2019-08-13  @80  			int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
076863473c0cdb Christoph Hellwig  2019-08-13   81  
076863473c0cdb Christoph Hellwig  2019-08-13   82  			if (pmd_type == _PAGE_PRESENT) {
076863473c0cdb Christoph Hellwig  2019-08-13   83  				pmd_dir->pmd[pmd_off] = 0;
076863473c0cdb Christoph Hellwig  2019-08-13   84  				virtaddr += PTRTREESIZE;
076863473c0cdb Christoph Hellwig  2019-08-13   85  				size -= PTRTREESIZE;
076863473c0cdb Christoph Hellwig  2019-08-13   86  				continue;
076863473c0cdb Christoph Hellwig  2019-08-13   87  			} else if (pmd_type == 0)
076863473c0cdb Christoph Hellwig  2019-08-13   88  				continue;
076863473c0cdb Christoph Hellwig  2019-08-13   89  		}
076863473c0cdb Christoph Hellwig  2019-08-13   90  
076863473c0cdb Christoph Hellwig  2019-08-13   91  		if (pmd_bad(*pmd_dir)) {
076863473c0cdb Christoph Hellwig  2019-08-13   92  			printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
076863473c0cdb Christoph Hellwig  2019-08-13   93  			pmd_clear(pmd_dir);
076863473c0cdb Christoph Hellwig  2019-08-13   94  			return;
076863473c0cdb Christoph Hellwig  2019-08-13   95  		}
076863473c0cdb Christoph Hellwig  2019-08-13   96  		pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
076863473c0cdb Christoph Hellwig  2019-08-13   97  
076863473c0cdb Christoph Hellwig  2019-08-13   98  		pte_val(*pte_dir) = 0;
076863473c0cdb Christoph Hellwig  2019-08-13   99  		virtaddr += PAGE_SIZE;
076863473c0cdb Christoph Hellwig  2019-08-13  100  		size -= PAGE_SIZE;
076863473c0cdb Christoph Hellwig  2019-08-13  101  	}
076863473c0cdb Christoph Hellwig  2019-08-13  102  
076863473c0cdb Christoph Hellwig  2019-08-13  103  	flush_tlb_all();
076863473c0cdb Christoph Hellwig  2019-08-13  104  }
076863473c0cdb Christoph Hellwig  2019-08-13  105  

:::::: The code at line 80 was first introduced by commit
:::::: 076863473c0cdbf7fdcbf97e1878028ccde3b4ec m68k: rename __iounmap and mark it static

:::::: TO: Christoph Hellwig <hch@lst.de>
:::::: CC: Christoph Hellwig <hch@lst.de>

---
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