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