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authorNanyong Sun <sunnanyong@huawei.com>2021-04-30 11:28:47 +0300
committerPalmer Dabbelt <palmerdabbelt@google.com>2021-05-22 20:19:29 +0300
commitf5397c3ee0a3e2ca0a6d66d079ffcd5386b45b81 (patch)
tree8372806f05bfd2b3cca7a2eef002302e0c3f04c8 /arch/riscv/include
parent6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff)
downloadlinux-f5397c3ee0a3e2ca0a6d66d079ffcd5386b45b81.tar.xz
riscv: mm: add _PAGE_LEAF macro
In riscv, a page table entry is leaf when any bit of read, write, or execute bit is set. So add a macro:_PAGE_LEAF instead of (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC), which is frequently used to determine if it is a leaf page. This make code easier to read, without any functional change. Signed-off-by: Nanyong Sun <sunnanyong@huawei.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/include')
-rw-r--r--arch/riscv/include/asm/pgtable-64.h3
-rw-r--r--arch/riscv/include/asm/pgtable-bits.h5
-rw-r--r--arch/riscv/include/asm/pgtable.h6
3 files changed, 8 insertions, 6 deletions
diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index f3b0da64c6c8..e3b7c5dd6a80 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -46,8 +46,7 @@ static inline int pud_bad(pud_t 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));
+ return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
}
static inline void set_pud(pud_t *pudp, pud_t pud)
diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h
index bbaeb5d35842..2ee413912926 100644
--- a/arch/riscv/include/asm/pgtable-bits.h
+++ b/arch/riscv/include/asm/pgtable-bits.h
@@ -39,5 +39,10 @@
#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
_PAGE_WRITE | _PAGE_EXEC | \
_PAGE_USER | _PAGE_GLOBAL))
+/*
+ * when all of R/W/X are zero, the PTE is a pointer to the next level
+ * of the page table; otherwise, it is a leaf PTE.
+ */
+#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
#endif /* _ASM_RISCV_PGTABLE_BITS_H */
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 9469f464e71a..dbced7d37768 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -190,8 +190,7 @@ static inline int pmd_bad(pmd_t 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));
+ return pmd_present(pmd) && (pmd_val(pmd) & _PAGE_LEAF);
}
static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
@@ -267,8 +266,7 @@ static inline int pte_exec(pte_t pte)
static inline int pte_huge(pte_t pte)
{
- return pte_present(pte)
- && (pte_val(pte) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
+ return pte_present(pte) && (pte_val(pte) & _PAGE_LEAF);
}
static inline int pte_dirty(pte_t pte)