linux-kernel - [PATCH v2 2/2] mm/damon: replace pmd_huge() with pmd_trans

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Date:   Thu, 18 Aug 2022 15:37:44 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     sj@...nel.org, akpm@...ux-foundation.org
Cc:     baolin.wang@...ux.alibaba.com, muchun.song@...ux.dev,
        mike.kravetz@...cle.com, damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] mm/damon: replace pmd_huge() with pmd_trans_huge() for THP

The pmd_huge() is usually used to indicate if a pmd level hugetlb,
however a pmd mapped huge page can only be THP in damon_mkold_pmd_entry()
or damon_young_pmd_entry(), so replacing pmd_huge() with pmd_trans_huge()
in this case to make code more readable according to the discussion [1].

[1] https://lore.kernel.org/all/098c1480-416d-bca9-cedb-ca495df69b64@linux.alibaba.com/

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 - New patch in v2.
---
 mm/damon/vaddr.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 1d16c6c..cc04d46 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -302,14 +302,14 @@ static int damon_mkold_pmd_entry(pmd_t *pmd, unsigned long addr,
 	pte_t *pte;
 	spinlock_t *ptl;
 
-	if (pmd_huge(*pmd)) {
+	if (pmd_trans_huge(*pmd)) {
 		ptl = pmd_lock(walk->mm, pmd);
 		if (!pmd_present(*pmd)) {
 			spin_unlock(ptl);
 			return 0;
 		}
 
-		if (pmd_huge(*pmd)) {
+		if (pmd_trans_huge(*pmd)) {
 			damon_pmdp_mkold(pmd, walk->mm, addr);
 			spin_unlock(ptl);
 			return 0;
@@ -434,14 +434,14 @@ static int damon_young_pmd_entry(pmd_t *pmd, unsigned long addr,
 	struct damon_young_walk_private *priv = walk->private;
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	if (pmd_huge(*pmd)) {
+	if (pmd_trans_huge(*pmd)) {
 		ptl = pmd_lock(walk->mm, pmd);
 		if (!pmd_present(*pmd)) {
 			spin_unlock(ptl);
 			return 0;
 		}
 
-		if (!pmd_huge(*pmd)) {
+		if (!pmd_trans_huge(*pmd)) {
 			spin_unlock(ptl);
 			goto regular_page;
 		}
-- 
1.8.3.1