mm: damon: use HPAGE_PMD_SIZE

Use HPAGE_PMD_SIZE instead of open coding.

Link: https://lkml.kernel.org/r/20220517145120.118523-1-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: Kefeng Wang

mm/damon/ops-common.c

@@ -73,8 +73,7 @@ void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm, unsigned long addr)
 	}
 
 #ifdef CONFIG_MMU_NOTIFIER
-	if (mmu_notifier_clear_young(mm, addr,
-				addr + ((1UL) << HPAGE_PMD_SHIFT)))
+	if (mmu_notifier_clear_young(mm, addr, addr + HPAGE_PMD_SIZE))
 		referenced = true;
 #endif /* CONFIG_MMU_NOTIFIER */
 

mm/damon/paddr.c

@@ -106,7 +106,7 @@ static bool __damon_pa_young(struct folio *folio, struct vm_area_struct *vma,
 			result->accessed = pmd_young(*pvmw.pmd) ||
 				!folio_test_idle(folio) ||
 				mmu_notifier_test_young(vma->vm_mm, addr);
-			result->page_sz = ((1UL) << HPAGE_PMD_SHIFT);
+			result->page_sz = HPAGE_PMD_SIZE;
 #else
 			WARN_ON_ONCE(1);
 #endif	/* CONFIG_TRANSPARENT_HUGEPAGE */

mm/damon/vaddr.c

@@ -442,7 +442,7 @@ static int damon_young_pmd_entry(pmd_t *pmd, unsigned long addr,
 		if (pmd_young(*pmd) || !page_is_idle(page) ||
 					mmu_notifier_test_young(walk->mm,
 						addr)) {
-			*priv->page_sz = ((1UL) << HPAGE_PMD_SHIFT);
+			*priv->page_sz = HPAGE_PMD_SIZE;
 			priv->young = true;
 		}
 		put_page(page);