arm64: Fix the pte_hw_dirty() check when AF/DBM is enabled

[karo-tx-linux.git] / arch / arm64 / include / asm / pgtable.h

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 6900b2d953717c721fb2318ef877428542baef17..69207f0168916582652f6af19a2164e518b51385 100644 (file)
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -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)