+ mm-damon-replace-pmd_huge-with-pmd_trans_huge-for-thp.patch added to mm-unstable branch

+ mm-damon-replace-pmd_huge-with-pmd_trans_huge-for-thp.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/damon: replace pmd_huge() with pmd_trans_huge() for THP
has been added to the -mm mm-unstable branch.  Its filename is
     mm-damon-replace-pmd_huge-with-pmd_trans_huge-for-thp.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-replace-pmd_huge-with-pmd_trans_huge-for-thp.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Baolin Wang <baolin.wang@linux.alibaba.com>
Subject: mm/damon: replace pmd_huge() with pmd_trans_huge() for THP
Date: Thu, 18 Aug 2022 15:37:44 +0800

pmd_huge() is usually used to indicate 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 replace pmd_huge() with pmd_trans_huge() in
this case to make the code more readable according to the discussion [1].

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

Link: https://lkml.kernel.org/r/a9e010ca5d299e18d740c7c52290ecb6a014dde6.1660805030.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/vaddr.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/mm/damon/vaddr.c~mm-damon-replace-pmd_huge-with-pmd_trans_huge-for-thp
+++ a/mm/damon/vaddr.c
@@ -302,14 +302,14 @@ static int damon_mkold_pmd_entry(pmd_t *
 	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 *
 	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;
 		}
_

Patches currently in -mm which might be from baolin.wang@linux.alibaba.com are

mm-migrate-do-not-retry-10-times-for-the-subpages-of-fail-to-migrate-thp.patch
mm-damon-validate-if-the-pmd-entry-is-present-before-accessing.patch
mm-damon-replace-pmd_huge-with-pmd_trans_huge-for-thp.patch