linux-kernel - [PATCH] RISC-V: redefine PTRS_PER_PGD/PTRS_PER_PMD/PTRS_PER

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Message-Id: <1556092268-4646-1-git-send-email-liush.damon@gmail.com>
Date:   Wed, 24 Apr 2019 15:51:08 +0800
From:   damon <liush.damon@...il.com>
To:     palmer@...ive.com
Cc:     aou@...s.berkeley.edu, anup.patel@....com, liush.damon@...il.com,
        rppt@...ux.ibm.com, sorear2@...il.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] RISC-V: redefine PTRS_PER_PGD/PTRS_PER_PMD/PTRS_PER_PTE

Use the number of addresses to define the relevant macros.

Signed-off-by: damon <liush.damon@...il.com>
---
 arch/riscv/include/asm/pgtable-32.h | 2 ++
 arch/riscv/include/asm/pgtable-64.h | 3 ++-
 arch/riscv/include/asm/pgtable.h    | 8 ++++++--
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable-32.h b/arch/riscv/include/asm/pgtable-32.h
index d61974b7..433886b 100644
--- a/arch/riscv/include/asm/pgtable-32.h
+++ b/arch/riscv/include/asm/pgtable-32.h
@@ -17,6 +17,8 @@
 #include <asm-generic/pgtable-nopmd.h>
 #include <linux/const.h>
 
+#define __PAGETABLE_PMD_FOLDED    1
+#define MAX_USER_VA_BITS	32
 /* Size of region mapped by a page global directory */
 #define PGDIR_SHIFT     22
 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 7aa0ea9..a56d4d0 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -16,6 +16,7 @@
 
 #include <linux/const.h>
 
+#define MAX_USER_VA_BITS	39
 #define PGDIR_SHIFT     30
 /* Size of region mapped by a page global directory */
 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
@@ -34,7 +35,7 @@
 #define pmd_val(x)      ((x).pmd)
 #define __pmd(x)        ((pmd_t) { (x) })
 
-#define PTRS_PER_PMD    (PAGE_SIZE / sizeof(pmd_t))
+#define PTRS_PER_PMD    (1 << (PGDIR_SHIFT - PMD_SHIFT))
 
 static inline int pud_present(pud_t pud)
 {
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 1141364..9148043 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -33,9 +33,13 @@
 #endif /* CONFIG_64BIT */
 
 /* Number of entries in the page global directory */
-#define PTRS_PER_PGD    (PAGE_SIZE / sizeof(pgd_t))
+#define PTRS_PER_PGD (1 << (MAX_USER_VA_BITS - PGDIR_SHIFT))
 /* Number of entries in the page table */
-#define PTRS_PER_PTE    (PAGE_SIZE / sizeof(pte_t))
+#ifdef __PAGETABLE_PMD_FOLDED
+#define PTRS_PER_PTE   (1 << (PGDIR_SHIFT - PAGE_SHIFT))
+#else
+#define PTRS_PER_PTE   (1 << (PMD_SHIFT - PAGE_SHIFT))
+#endif
 
 /* Number of PGD entries that a user-mode program can use */
 #define USER_PTRS_PER_PGD   (TASK_SIZE / PGDIR_SIZE)
-- 
1.9.1