Steven Price <steven.price@xxxxxxx> 於 2019年10月24日 週四 下午5:40寫道：
>
> walk_page_range() is going to be allowed to walk page tables other than
> those of user space. For this it needs to know when it has reached a
> 'leaf' entry in the page tables. This information is provided by the
> p?d_leaf() functions/macros.
>
> For riscv a page is a leaf page when it has a read, write or execute bit
> set on it.
>
> CC: Palmer Dabbelt <palmer@xxxxxxxxxx>
> CC: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
> CC: linux-riscv@xxxxxxxxxxxxxxxxxxx
> Reviewed-by: Alexandre Ghiti <alex@xxxxxxxx>
> Acked-by: Paul Walmsley <paul.walmsley@xxxxxxxxxx> # for arch/riscv
> Signed-off-by: Steven Price <steven.price@xxxxxxx>
> ---
> arch/riscv/include/asm/pgtable-64.h | 7 +++++++
> arch/riscv/include/asm/pgtable.h | 7 +++++++
> 2 files changed, 14 insertions(+)
>
> diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
> index 74630989006d..4c4d2c65ba6c 100644
> --- a/arch/riscv/include/asm/pgtable-64.h
> +++ b/arch/riscv/include/asm/pgtable-64.h
> @@ -43,6 +43,13 @@ static inline int pud_bad(pud_t pud)
> return !pud_present(pud);
> }
>
> +#define pud_leaf pud_leaf
> +static inline int pud_leaf(pud_t pud)
> +{
> + return pud_present(pud) &&
> + (pud_val(pud) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
> +}
> +
> static inline void set_pud(pud_t *pudp, pud_t pud)
> {
> *pudp = pud;
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 7255f2d8395b..3aa972dda75a 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -130,6 +130,13 @@ static inline int pmd_bad(pmd_t pmd)
> return !pmd_present(pmd);
> }
>
> +#define pmd_leaf pmd_leaf
> +static inline int pmd_leaf(pmd_t pmd)
> +{
> + return pmd_present(pmd) &&
> + (pmd_val(pmd) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
> +}
> +
> static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
> {
> *pmdp = pmd;
> --
> 2.20.1
>
>
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It's good to me.
Reviewed-by: Zong Li <zong.li@xxxxxxxxxx>
