+ arm64-mm-fix-page-table-check-compile-error-for-config_pgtable_levels=2.patch added to mm-unstable branch

+ arm64-mm-fix-page-table-check-compile-error-for-config_pgtable_levels=2.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: arm64/mm: fix page table check compile error for CONFIG_PGTABLE_LEVELS=2
has been added to the -mm mm-unstable branch.  Its filename is
     arm64-mm-fix-page-table-check-compile-error-for-config_pgtable_levels=2.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-mm-fix-page-table-check-compile-error-for-config_pgtable_levels=2.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: arm64/mm: fix page table check compile error for CONFIG_PGTABLE_LEVELS=2
Date: Tue, 17 May 2022 07:45:48 +0000

If CONFIG_PGTABLE_LEVELS=2 and CONFIG_ARCH_SUPPORTS_PAGE_TABLE_CHECK=y,
then we trigger a compile error:

  error: implicit declaration of function 'pte_user_accessible_page'

Move the definition of page table check helper out of branch
CONFIG_PGTABLE_LEVELS > 2

Link: https://lkml.kernel.org/r/20220517074548.2227779-3-tongtiangen@huawei.com
Fixes: daf214c14dbe ("arm64/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK")
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Guohanjun <guohanjun@huawei.com>
Cc: Xie XiuQi <xiexiuqi@huawei.com>
Cc: kernel test robot <lkp@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/include/asm/pgtable.h |   33 ++++++++++++++---------------
 1 file changed, 17 insertions(+), 16 deletions(-)

--- a/arch/arm64/include/asm/pgtable.h~arm64-mm-fix-page-table-check-compile-error-for-config_pgtable_levels=2
+++ a/arch/arm64/include/asm/pgtable.h
@@ -667,22 +667,6 @@ static inline unsigned long pmd_page_vad
 #define pud_valid(pud)		pte_valid(pud_pte(pud))
 #define pud_user(pud)		pte_user(pud_pte(pud))
 
-#ifdef CONFIG_PAGE_TABLE_CHECK
-static inline bool pte_user_accessible_page(pte_t pte)
-{
-	return pte_present(pte) && (pte_user(pte) || pte_user_exec(pte));
-}
-
-static inline bool pmd_user_accessible_page(pmd_t pmd)
-{
-	return pmd_present(pmd) && (pmd_user(pmd) || pmd_user_exec(pmd));
-}
-
-static inline bool pud_user_accessible_page(pud_t pud)
-{
-	return pud_present(pud) && pud_user(pud);
-}
-#endif
 
 static inline void set_pud(pud_t *pudp, pud_t pud)
 {
@@ -855,6 +839,23 @@ static inline int pgd_devmap(pgd_t pgd)
 }
 #endif
 
+#ifdef CONFIG_PAGE_TABLE_CHECK
+static inline bool pte_user_accessible_page(pte_t pte)
+{
+	return pte_present(pte) && (pte_user(pte) || pte_user_exec(pte));
+}
+
+static inline bool pmd_user_accessible_page(pmd_t pmd)
+{
+	return pmd_present(pmd) && (pmd_user(pmd) || pmd_user_exec(pmd));
+}
+
+static inline bool pud_user_accessible_page(pud_t pud)
+{
+	return pud_present(pud) && pud_user(pud);
+}
+#endif
+
 /*
  * Atomic pte/pmd modifications.
  */
_

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