mm/damon/ops-common: refactor to use {pte|pmd}p_clear_young_notify()

With the fix in place to atomically test and clear young on ptes and pmds,
simplify the code to handle the clearing for both the primary mmu and the
mmu notifier with a single API call.

Link: https://lkml.kernel.org/r/20230602092949.545577-4-ryan.roberts@arm.comSigned-off-by: Ryan Roberts <ryan.roberts@arm.com>
Acked-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/damon/ops-common.c

@@ -39,21 +39,12 @@ struct folio *damon_get_folio(unsigned long pfn)
 
 void damon_ptep_mkold(pte_t *pte, struct vm_area_struct *vma, unsigned long addr)
 {
-	bool referenced = false;
 	struct folio *folio = damon_get_folio(pte_pfn(*pte));
 
 	if (!folio)
 		return;
 
-	if (ptep_test_and_clear_young(vma, addr, pte))
-		referenced = true;
-
-#ifdef CONFIG_MMU_NOTIFIER
-	if (mmu_notifier_clear_young(vma->vm_mm, addr, addr + PAGE_SIZE))
-		referenced = true;
-#endif /* CONFIG_MMU_NOTIFIER */
-
-	if (referenced)
+	if (ptep_clear_young_notify(vma, addr, pte))
 		folio_set_young(folio);
 
 	folio_set_idle(folio);
@@ -63,21 +54,12 @@ void damon_ptep_mkold(pte_t *pte, struct vm_area_struct *vma, unsigned long addr
 void damon_pmdp_mkold(pmd_t *pmd, struct vm_area_struct *vma, unsigned long addr)
 {
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	bool referenced = false;
 	struct folio *folio = damon_get_folio(pmd_pfn(*pmd));
 
 	if (!folio)
 		return;
 
-	if (pmdp_test_and_clear_young(vma, addr, pmd))
-		referenced = true;
-
-#ifdef CONFIG_MMU_NOTIFIER
-	if (mmu_notifier_clear_young(vma->vm_mm, addr, addr + HPAGE_PMD_SIZE))
-		referenced = true;
-#endif /* CONFIG_MMU_NOTIFIER */
-
-	if (referenced)
+	if (pmdp_clear_young_notify(vma, addr, pmd))
 		folio_set_young(folio);
 
 	folio_set_idle(folio);