@@ -146,7 +146,7 @@ extern struct page *empty_zero_page;
#define pte_exec(pte) (!(pte_val(pte) & PTE_UXN))
#ifdef CONFIG_ARM64_HW_AFDBM
-#define pte_hw_dirty(pte) (!(pte_val(pte) & PTE_RDONLY))
+#define pte_hw_dirty(pte) (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY))
#else
#define pte_hw_dirty(pte) (0)
#endif
@@ -238,7 +238,7 @@ extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
* When hardware DBM is not present, the sofware PTE_DIRTY bit is updated via
* the page fault mechanism. Checking the dirty status of a pte becomes:
*
- * PTE_DIRTY || !PTE_RDONLY
+ * PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY)
*/
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
Commit 2f4b829c625e (arm64: Add support for hardware updates of the access and dirty pte bits) introduced support for handling hardware updates of the access flag and dirty status. The PTE is automatically dirtied in hardware (if supported) by clearing the PTE_RDONLY bit when the PTE_DBM/PTE_WRITE bit is set. The pte_hw_dirty() macro was added to detect a hardware dirtied pte. The pte_dirty() macro checks for both software PTE_DIRTY and pte_hw_dirty(). Functions like pte_modify() clear the PTE_RDONLY bit since it is meant to be set in set_pte_at() when written to memory. In such cases, pte_hw_dirty() would return true even though such pte is clean. This patch changes pte_hw_dirty() to test the PTE_DBM/PTE_WRITE bit together with PTE_RDONLY. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Julien Grall <julien.grall@citrix.com> Cc: Will Deacon <will.deacon@arm.com> Fixes: 2f4b829c625e ("arm64: Add support for hardware updates of the access and dirty pte bits") --- arch/arm64/include/asm/pgtable.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)