linux-kernel - [PATCH -next 1/2] riscv/mm: fix two page table check related issues

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Message-ID: <20220517074548.2227779-2-tongtiangen@huawei.com>
Date:   Tue, 17 May 2022 07:45:47 +0000
From:   Tong Tiangen <tongtiangen@...wei.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Arnd Bergmann <arnd@...db.de>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-riscv@...ts.infradead.org>, <linux-arch@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Tong Tiangen <tongtiangen@...wei.com>,
        <wangkefeng.wang@...wei.com>, Guohanjun <guohanjun@...wei.com>,
        Xie XiuQi <xiexiuqi@...wei.com>
Subject: [PATCH -next 1/2] riscv/mm: fix two page table check related issues

Two page table check related issues have been fixed here.

1. Open CONFIG_PAGE_TABLE_CHECK in riscv32, we got a compile error[1]:

   error: implicit declaration of function 'pud_leaf'

   Add pud_leaf() definition to incluce/asm-generic/pgtable-nopmd.h to fix
   this issue.

2. Keep consistent with other pud_xxx() helpers, move pud_user() to
   pgtable-64.h and add pud_user() to pgtable-nopmd.h.

[1]https://lore.kernel.org/linux-mm/202205161811.2nLxmN2O-lkp@intel.com/T/

Fixes: 856eed79f8d3 ("riscv/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Tong Tiangen <tongtiangen@...wei.com>
---
 arch/riscv/include/asm/pgtable-64.h | 5 +++++
 arch/riscv/include/asm/pgtable.h    | 5 -----
 include/asm-generic/pgtable-nopmd.h | 2 ++
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
index 7e246e9f8d70..ba2494cbc24f 100644
--- a/arch/riscv/include/asm/pgtable-64.h
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -86,6 +86,11 @@ static inline int pud_leaf(pud_t pud)
 	return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
 }
 
+static inline int pud_user(pud_t pud)
+{
+	return pud_val(pud) & _PAGE_USER;
+}
+
 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 62e733c85836..4200ddede880 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -634,11 +634,6 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 	return __set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd));
 }
 
-static inline int pud_user(pud_t pud)
-{
-	return pte_user(pud_pte(pud));
-}
-
 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
 				pud_t *pudp, pud_t pud)
 {
diff --git a/include/asm-generic/pgtable-nopmd.h b/include/asm-generic/pgtable-nopmd.h
index 10789cf51d16..8ffd64e7a24c 100644
--- a/include/asm-generic/pgtable-nopmd.h
+++ b/include/asm-generic/pgtable-nopmd.h
@@ -30,6 +30,8 @@ typedef struct { pud_t pud; } pmd_t;
 static inline int pud_none(pud_t pud)		{ return 0; }
 static inline int pud_bad(pud_t pud)		{ return 0; }
 static inline int pud_present(pud_t pud)	{ return 1; }
+static inline int pud_user(pud_t pud)		{ return 0; }
+static inline int pud_leaf(pud_t pud)		{ return 0; }
 static inline void pud_clear(pud_t *pud)	{ }
 #define pmd_ERROR(pmd)				(pud_ERROR((pmd).pud))
 
-- 
2.25.1