Messages in this thread Patch in this message | | | From | Steven Price <> | Subject | [PATCH v13 07/22] riscv: mm: Add p?d_leaf() definitions | Date | Thu, 24 Oct 2019 10:37:01 +0100 |
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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@sifive.com> CC: Albert Ou <aou@eecs.berkeley.edu> CC: linux-riscv@lists.infradead.org Reviewed-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Paul Walmsley <paul.walmsley@sifive.com> # for arch/riscv Signed-off-by: Steven Price <steven.price@arm.com> --- 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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