Hi Mike,

I love your patch! Yet something to improve:

[auto build test ERROR on mmotm/master]

url:    https://github.com/0day-ci/linux/commits/Mike-Rapoport/mm-remove-__ARCH_HAS_4LEVEL_HACK/20191025-063009
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: microblaze-mmu_defconfig (attached as .config)
compiler: microblaze-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=microblaze 

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

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/shm.h:6:0,
                    from include/linux/sched.h:16,
                    from arch/microblaze/mm/consistent.c:15:
   arch/microblaze/mm/consistent.c: In function 'consistent_virt_to_pte':
>> arch/microblaze/include/asm/pgtable.h:458:34: error: passing argument 1 of 'pmd_offset' from incompatible pointer type [-Werror=incompatible-pointer-types]
    #define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
                                     ^
   arch/microblaze/include/asm/page.h:105:30: note: in definition of macro 'pgd_val'
    #   define pgd_val(x)      ((x).pgd)
                                 ^
>> include/asm-generic/pgtable-nopud.h:50:24: note: in expansion of macro 'p4d_val'
    #define pud_val(x)    (p4d_val((x).p4d))
                           ^~~~~~~
>> include/asm-generic/pgtable-nopmd.h:49:24: note: in expansion of macro 'pud_val'
    #define pmd_val(x)    (pud_val((x).pud))
                           ^~~~~~~
>> arch/microblaze/include/asm/pgtable.h:448:48: note: in expansion of macro 'pmd_val'
    #define pmd_page_kernel(pmd) ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
                                                   ^~~~~~~
>> arch/microblaze/include/asm/pgtable.h:464:13: note: in expansion of macro 'pmd_page_kernel'
     ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(addr))
                ^~~~~~~~~~~~~~~
>> arch/microblaze/mm/consistent.c:162:9: note: in expansion of macro 'pte_offset_kernel'
     return pte_offset_kernel(pmd_offset(pgd_offset_k(addr), addr), addr);
            ^~~~~~~~~~~~~~~~~
>> arch/microblaze/include/asm/pgtable.h:454:31: note: in expansion of macro 'pgd_offset'
    #define pgd_offset_k(address) pgd_offset(&init_mm, address)
                                  ^~~~~~~~~~
>> arch/microblaze/mm/consistent.c:162:38: note: in expansion of macro 'pgd_offset_k'
     return pte_offset_kernel(pmd_offset(pgd_offset_k(addr), addr), addr);
                                         ^~~~~~~~~~~~
   In file included from arch/microblaze/include/asm/pgtable.h:62:0,
                    from include/linux/mm.h:99,
                    from arch/microblaze/include/asm/uaccess.h:15,
                    from include/linux/uaccess.h:11,
                    from include/linux/sched/task.h:11,
                    from include/linux/sched/signal.h:9,
                    from include/linux/ptrace.h:7,
                    from arch/microblaze/mm/consistent.c:20:
   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)
                          ^~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/pmd_offset +458 arch/microblaze/include/asm/pgtable.h

15902bf63c8332 Michal Simek   2009-05-26  444  
15902bf63c8332 Michal Simek   2009-05-26  445  /* Convert pmd entry to page */
15902bf63c8332 Michal Simek   2009-05-26  446  /* our pmd entry is an effective address of pte table*/
15902bf63c8332 Michal Simek   2009-05-26  447  /* returns effective address of the pmd entry*/
15902bf63c8332 Michal Simek   2009-05-26 @448  #define pmd_page_kernel(pmd)	((unsigned long) (pmd_val(pmd) & PAGE_MASK))
15902bf63c8332 Michal Simek   2009-05-26  449  
15902bf63c8332 Michal Simek   2009-05-26  450  /* returns struct *page of the pmd entry*/
15902bf63c8332 Michal Simek   2009-05-26  451  #define pmd_page(pmd)	(pfn_to_page(__pa(pmd_val(pmd)) >> PAGE_SHIFT))
15902bf63c8332 Michal Simek   2009-05-26  452  
15902bf63c8332 Michal Simek   2009-05-26  453  /* to find an entry in a kernel page-table-directory */
15902bf63c8332 Michal Simek   2009-05-26 @454  #define pgd_offset_k(address) pgd_offset(&init_mm, address)
15902bf63c8332 Michal Simek   2009-05-26  455  
15902bf63c8332 Michal Simek   2009-05-26  456  /* to find an entry in a page-table-directory */
15902bf63c8332 Michal Simek   2009-05-26  457  #define pgd_index(address)	 ((address) >> PGDIR_SHIFT)
15902bf63c8332 Michal Simek   2009-05-26 @458  #define pgd_offset(mm, address)	 ((mm)->pgd + pgd_index(address))
15902bf63c8332 Michal Simek   2009-05-26  459  
15902bf63c8332 Michal Simek   2009-05-26  460  /* Find an entry in the third-level page table.. */
15902bf63c8332 Michal Simek   2009-05-26  461  #define pte_index(address)		\
15902bf63c8332 Michal Simek   2009-05-26  462  	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
15902bf63c8332 Michal Simek   2009-05-26  463  #define pte_offset_kernel(dir, addr)	\
15902bf63c8332 Michal Simek   2009-05-26 @464  	((pte_t *) pmd_page_kernel(*(dir)) + pte_index(addr))
15902bf63c8332 Michal Simek   2009-05-26  465  #define pte_offset_map(dir, addr)		\
ece0e2b6406a99 Peter Zijlstra 2010-10-26  466  	((pte_t *) kmap_atomic(pmd_page(*(dir))) + pte_index(addr))
15902bf63c8332 Michal Simek   2009-05-26  467  

:::::: The code at line 458 was first introduced by commit
:::::: 15902bf63c8332946e5a1f48a72e3ae22874b11b microblaze_mmu_v2: Page table - ioremap - pgtable.c/h, section update

:::::: TO: Michal Simek <monstr@monstr.eu>
:::::: CC: Michal Simek <monstr@monstr.eu>

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