[linux-next:master 5946/5967] arch/arm64/mm/mmu.c:827:21: error: incompatible pointer types passing 'pgd_t *' to parameter of type 'p4d_t *'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   b56557c8e5210c25b008da636ef804b228967aa6
commit: 87d900aef3e229a891438c88debc533a8a1fa976 [5946/5967] arm/arm64: add support for folded p4d page tables
config: arm64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (git://gitmirror/llvm_project 211fb91f1067ecdf7c0b8a019bcf76554d813129)
reproduce:
        # FIXME the reproduce steps for clang is not ready yet

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

All errors (new ones prefixed by >>):

>> arch/arm64/mm/mmu.c:827:21: error: incompatible pointer types passing 'pgd_t *' to parameter of type 'p4d_t *' [-Werror,-Wincompatible-pointer-types]
                   pudp = pud_offset(pgdp, addr);
                                     ^~~~
   include/asm-generic/pgtable-nopud.h:45:40: note: passing argument to parameter 'p4d' here
   static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
                                          ^
   arch/arm64/mm/mmu.c:955:21: error: incompatible pointer types passing 'pgd_t *' to parameter of type 'p4d_t *' [-Werror,-Wincompatible-pointer-types]
                   pudp = pud_offset(pgdp, addr);
                                     ^~~~
   include/asm-generic/pgtable-nopud.h:45:40: note: passing argument to parameter 'p4d' here
   static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
                                          ^
   arch/arm64/mm/mmu.c:975:20: error: incompatible pointer types passing 'pgd_t *' to parameter of type 'p4d_t *' [-Werror,-Wincompatible-pointer-types]
           pudp = pud_offset(pgdp, 0UL);
                             ^~~~
   include/asm-generic/pgtable-nopud.h:45:40: note: passing argument to parameter 'p4d' here
   static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
                                          ^
   3 errors generated.

vim +827 arch/arm64/mm/mmu.c

de323e651df4680 Anshuman Khandual 2020-02-13  818  
de323e651df4680 Anshuman Khandual 2020-02-13  819  static void unmap_hotplug_pud_range(pgd_t *pgdp, unsigned long addr,
de323e651df4680 Anshuman Khandual 2020-02-13  820  				    unsigned long end, bool free_mapped)
de323e651df4680 Anshuman Khandual 2020-02-13  821  {
de323e651df4680 Anshuman Khandual 2020-02-13  822  	unsigned long next;
de323e651df4680 Anshuman Khandual 2020-02-13  823  	pud_t *pudp, pud;
de323e651df4680 Anshuman Khandual 2020-02-13  824  
de323e651df4680 Anshuman Khandual 2020-02-13  825  	do {
de323e651df4680 Anshuman Khandual 2020-02-13  826  		next = pud_addr_end(addr, end);
de323e651df4680 Anshuman Khandual 2020-02-13 @827  		pudp = pud_offset(pgdp, addr);
de323e651df4680 Anshuman Khandual 2020-02-13  828  		pud = READ_ONCE(*pudp);
de323e651df4680 Anshuman Khandual 2020-02-13  829  		if (pud_none(pud))
de323e651df4680 Anshuman Khandual 2020-02-13  830  			continue;
de323e651df4680 Anshuman Khandual 2020-02-13  831  
de323e651df4680 Anshuman Khandual 2020-02-13  832  		WARN_ON(!pud_present(pud));
de323e651df4680 Anshuman Khandual 2020-02-13  833  		if (pud_sect(pud)) {
de323e651df4680 Anshuman Khandual 2020-02-13  834  			pud_clear(pudp);
de323e651df4680 Anshuman Khandual 2020-02-13  835  
de323e651df4680 Anshuman Khandual 2020-02-13  836  			/*
de323e651df4680 Anshuman Khandual 2020-02-13  837  			 * One TLBI should be sufficient here as the PUD_SIZE
de323e651df4680 Anshuman Khandual 2020-02-13  838  			 * range is mapped with a single block entry.
de323e651df4680 Anshuman Khandual 2020-02-13  839  			 */
de323e651df4680 Anshuman Khandual 2020-02-13  840  			flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
de323e651df4680 Anshuman Khandual 2020-02-13  841  			if (free_mapped)
de323e651df4680 Anshuman Khandual 2020-02-13  842  				free_hotplug_page_range(pud_page(pud),
de323e651df4680 Anshuman Khandual 2020-02-13  843  							PUD_SIZE);
de323e651df4680 Anshuman Khandual 2020-02-13  844  			continue;
de323e651df4680 Anshuman Khandual 2020-02-13  845  		}
de323e651df4680 Anshuman Khandual 2020-02-13  846  		WARN_ON(!pud_table(pud));
de323e651df4680 Anshuman Khandual 2020-02-13  847  		unmap_hotplug_pmd_range(pudp, addr, next, free_mapped);
de323e651df4680 Anshuman Khandual 2020-02-13  848  	} while (addr = next, addr < end);
de323e651df4680 Anshuman Khandual 2020-02-13  849  }
de323e651df4680 Anshuman Khandual 2020-02-13  850  

:::::: The code at line 827 was first introduced by commit
:::::: de323e651df46808081eeb17268054f77932a119 arm64/mm: Enable memory hot remove

:::::: TO: Anshuman Khandual <anshuman.khandual@arm.com>
:::::: CC: Catalin Marinas <catalin.marinas@arm.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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