[PATCH v1] arm64/mm: Fix pud_user_accessible_page() for PGTABLE_LEVELS <= 2

[Ryan Roberts]

The recent change to use pud_valid() as part of the implementation of
pud_user_accessible_page() fails to build when PGTABLE_LEVELS <= 2
because pud_valid() is not defined in that case.

Fix this by defining pud_valid() to false for this case. This means that
pud_user_accessible_page() will correctly always return false for this
config.

Fixes: f0f5863a0fb0 ("arm64/mm: Remove PTE_PROT_NONE bit")
Reported-by: kernel test robot <lkp at intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202405082221.43rfWxz5-lkp@intel.com/
Signed-off-by: Ryan Roberts <ryan.roberts at arm.com>
---
 arch/arm64/include/asm/pgtable.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 78fd3e2ef8c6..bde9fd179388 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -814,6 +814,7 @@ static inline pmd_t *pud_pgtable(pud_t pud)

 #else

+#define pud_valid(pud)		false
 #define pud_page_paddr(pud)	({ BUILD_BUG(); 0; })
 #define pud_user_exec(pud)	pud_user(pud) /* Always 0 with folding */

--
2.43.0