+ riscv-mm-fix-two-page-table-check-related-issues.patch added to mm-unstable branch

+ riscv-mm-fix-two-page-table-check-related-issues.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: riscv/mm: fix two page table check related issues
has been added to the -mm mm-unstable branch.  Its filename is
     riscv-mm-fix-two-page-table-check-related-issues.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/riscv-mm-fix-two-page-table-check-related-issues.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Tong Tiangen <tongtiangen@huawei.com>
Subject: riscv/mm: fix two page table check related issues
Date: Tue, 17 May 2022 07:45:47 +0000

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/

Link: https://lkml.kernel.org/r/20220517074548.2227779-2-tongtiangen@huawei.com
Fixes: 856eed79f8d3 ("riscv/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK")
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Guohanjun <guohanjun@huawei.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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(-)

--- a/arch/riscv/include/asm/pgtable-64.h~riscv-mm-fix-two-page-table-check-related-issues
+++ a/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;
--- a/arch/riscv/include/asm/pgtable.h~riscv-mm-fix-two-page-table-check-related-issues
+++ a/arch/riscv/include/asm/pgtable.h
@@ -634,11 +634,6 @@ static inline void set_pmd_at(struct mm_
 	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)
 {
--- a/include/asm-generic/pgtable-nopmd.h~riscv-mm-fix-two-page-table-check-related-issues
+++ a/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))
 
_

Patches currently in -mm which might be from tongtiangen@huawei.com are

riscv-mm-fix-two-page-table-check-related-issues.patch
arm64-mm-fix-page-table-check-compile-error-for-config_pgtable_levels=2.patch