Re: [PATCH v4 29/34] riscv: Convert alloc_{pmd, pte}_late() to use ptdescs

[Mike Rapoport <rppt@kernel.org>]

On Mon, Jun 12, 2023 at 02:04:18PM -0700, Vishal Moola (Oracle) wrote:
> As part of the conversions to replace pgtable constructor/destructors with
> ptdesc equivalents, convert various page table functions to use ptdescs.
> 
> Some of the functions use the *get*page*() helper functions. Convert
> these to use pagetable_alloc() and ptdesc_address() instead to help
> standardize page tables further.
> 
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>

Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>

> ---
>  arch/riscv/include/asm/pgalloc.h |  8 ++++----
>  arch/riscv/mm/init.c             | 16 ++++++----------
>  2 files changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/pgalloc.h b/arch/riscv/include/asm/pgalloc.h
> index 59dc12b5b7e8..d169a4f41a2e 100644
> --- a/arch/riscv/include/asm/pgalloc.h
> +++ b/arch/riscv/include/asm/pgalloc.h
> @@ -153,10 +153,10 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
>  
>  #endif /* __PAGETABLE_PMD_FOLDED */
>  
> -#define __pte_free_tlb(tlb, pte, buf)   \
> -do {                                    \
> -	pgtable_pte_page_dtor(pte);     \
> -	tlb_remove_page((tlb), pte);    \
> +#define __pte_free_tlb(tlb, pte, buf)			\
> +do {							\
> +	pagetable_pte_dtor(page_ptdesc(pte));		\
> +	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));\
>  } while (0)
>  #endif /* CONFIG_MMU */
>  
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 3d689ffb2072..6bfeec80bf4e 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -354,12 +354,10 @@ static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
>  
>  static phys_addr_t __init alloc_pte_late(uintptr_t va)
>  {
> -	unsigned long vaddr;
> -
> -	vaddr = __get_free_page(GFP_KERNEL);
> -	BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page((void *)vaddr)));
> +	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0);
>  
> -	return __pa(vaddr);
> +	BUG_ON(!ptdesc || !pagetable_pte_ctor(ptdesc));
> +	return __pa((pte_t *)ptdesc_address(ptdesc));
>  }
>  
>  static void __init create_pte_mapping(pte_t *ptep,
> @@ -437,12 +435,10 @@ static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
>  
>  static phys_addr_t __init alloc_pmd_late(uintptr_t va)
>  {
> -	unsigned long vaddr;
> -
> -	vaddr = __get_free_page(GFP_KERNEL);
> -	BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page((void *)vaddr)));
> +	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0);
>  
> -	return __pa(vaddr);
> +	BUG_ON(!ptdesc || !pagetable_pmd_ctor(ptdesc));
> +	return __pa((pmd_t *)ptdesc_address(ptdesc));
>  }
>  
>  static void __init create_pmd_mapping(pmd_t *pmdp,
> -- 
> 2.40.1
> 
> 

-- 
Sincerely yours,
Mike.