linux-kernel - Re: [PATCH v2] riscv: Use PMD_SIZE to repalce PTE_PARENT

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Message-ID: <CAAhSdy2FkTqbYzP9naeUeOR+pW5-GphCR118D63Oy5C8UyQwhA@mail.gmail.com>
Date:   Tue, 5 Nov 2019 08:51:29 +0530
From:   Anup Patel <anup@...infault.org>
To:     Zong Li <zong.li@...ive.com>
Cc:     "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Anup Patel <Anup.Patel@....com>
Subject: Re: [PATCH v2] riscv: Use PMD_SIZE to repalce PTE_PARENT_SIZE

On Tue, Nov 5, 2019 at 7:50 AM Zong Li <zong.li@...ive.com> wrote:
>
> The PMD_SIZE is equal to PGDIR_SIZE when __PAGETABLE_PMD_FOLDED is
> defined.
>
> Signed-off-by: Zong Li <zong.li@...ive.com>
> ---
>  arch/riscv/mm/init.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> index 573463d..642b330 100644
> --- a/arch/riscv/mm/init.c
> +++ b/arch/riscv/mm/init.c
> @@ -273,7 +273,6 @@ static void __init create_pmd_mapping(pmd_t *pmdp,
>  #define get_pgd_next_virt(__pa)        get_pmd_virt(__pa)
>  #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)     \
>         create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
> -#define PTE_PARENT_SIZE                PMD_SIZE
>  #define fixmap_pgd_next                fixmap_pmd
>  #else
>  #define pgd_next_t             pte_t
> @@ -281,7 +280,6 @@ static void __init create_pmd_mapping(pmd_t *pmdp,
>  #define get_pgd_next_virt(__pa)        get_pte_virt(__pa)
>  #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)     \
>         create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
> -#define PTE_PARENT_SIZE                PGDIR_SIZE
>  #define fixmap_pgd_next                fixmap_pte
>  #endif
>
> @@ -316,10 +314,10 @@ static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
>  {
>         uintptr_t map_size = PAGE_SIZE;
>
> -       /* Upgrade to PMD/PGDIR mappings whenever possible */
> -       if (!(base & (PTE_PARENT_SIZE - 1)) &&
> -           !(size & (PTE_PARENT_SIZE - 1)))
> -               map_size = PTE_PARENT_SIZE;
> +       /* Upgrade to PMD_SIZE mappings whenever possible */
> +       if (!(base & (PMD_SIZE - 1)) &&
> +           !(size & (PMD_SIZE - 1)))
> +               map_size = PMD_SIZE;
>
>         return map_size;
>  }
> --
> 2.7.4
>

LGTM.

Reviewed-by: Anup Patel <anup@...infault.org>

Regards,
Anup