From: Anshuman Khandual anshuman.khandual@arm.com
[ Upstream commit e377ab82311af95c99648c6424a6b888a0ccb102 ]
Semantics wise, [pud|pmd]_bad() have always implied that a given [PUD|PMD] entry does not have a pointer to the next level page table. This had been made clear in the commit a1c76574f345 ("arm64: mm: use *_sect to check for section maps"). Hence explicitly check for a table entry rather than just testing a single bit. This basically redefines [pud|pmd]_bad() in terms of [pud|pmd]_table() making the semantics clear.
Cc: Catalin Marinas catalin.marinas@arm.com Cc: Will Deacon will@kernel.org Cc: Mark Rutland mark.rutland@arm.com Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual anshuman.khandual@arm.com Acked-by: Mark Rutland mark.rutland@arm.com Acked-by: Catalin Marinas catalin.marinas@arm.com Acked-by: Mark Rutland mark.rutland@arm.com Link: https://lore.kernel.org/r/1620644871-26280-1-git-send-email-anshuman.khandua... Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/include/asm/pgtable.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index f3a70dc7c594..9cf8e304bb56 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -512,13 +512,12 @@ extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
#define pmd_none(pmd) (!pmd_val(pmd))
-#define pmd_bad(pmd) (!(pmd_val(pmd) & PMD_TABLE_BIT)) - #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ PMD_TYPE_TABLE) #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ PMD_TYPE_SECT) #define pmd_leaf(pmd) pmd_sect(pmd) +#define pmd_bad(pmd) (!pmd_table(pmd))
#if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3 static inline bool pud_sect(pud_t pud) { return false; } @@ -602,7 +601,7 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) pr_err("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e))
#define pud_none(pud) (!pud_val(pud)) -#define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT)) +#define pud_bad(pud) (!pud_table(pud)) #define pud_present(pud) pte_present(pud_pte(pud)) #define pud_leaf(pud) pud_sect(pud) #define pud_valid(pud) pte_valid(pud_pte(pud))