Re: [PATCH -next] riscv: mm: fix build errors caused by mk_pmd()

[Palmer Dabbelt]

On Mon, 24 May 2021 00:02:20 PDT (-0700), sunnanyong@xxxxxxxxxx wrote:
> With "riscv: mm: add THP support on 64-bit", mk_pmd() function
> introduce build errors,
> 1.build with CONFIG_ARCH_RV32I=y:
> arch/riscv/include/asm/pgtable.h: In function 'mk_pmd':
> arch/riscv/include/asm/pgtable.h:513:9: error: implicit declaration of function 'pfn_pmd';
>  did you mean 'pfn_pgd'? [-Werror=implicit-function-declaration]
>
> 2.build with CONFIG_SPARSEMEM=y && CONFIG_SPARSEMEM_VMEMMAP=n
> arch/riscv/include/asm/pgtable.h: In function 'mk_pmd':
> include/asm-generic/memory_model.h:64:14: error: implicit declaration of function 'page_to_section';
>  did you mean 'present_section'? [-Werror=implicit-function-declaration]
>
> Use macro definition instead of inline function for mk_pmd
> to fix the above problems.It is similar to the mk_pte macro.
>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Signed-off-by: Nanyong Sun <sunnanyong@xxxxxxxxxx>
> ---
>  arch/riscv/include/asm/pgtable.h | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 4b708ae08910..f35d9c90d4cb 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -508,10 +508,7 @@ static inline unsigned long pmd_pfn(pmd_t pmd)
>  	return ((__pmd_to_phys(pmd) & PMD_MASK) >> PAGE_SHIFT);
>  }
>
> -static inline pmd_t mk_pmd(struct page *page, pgprot_t prot)
> -{
> -	return pfn_pmd(page_to_pfn(page), prot);
> -}
> +#define mk_pmd(page, prot)    pfn_pmd(page_to_pfn(page), prot)
>
>  static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
>  {

Thanks, this is on for-next.