The patch titled
Subject: damon: use pmdp_get instead of drectly dereferencing pmd
has been added to the -mm mm-unstable branch. Its filename is
damon-use-pmdp_get-instead-of-drectly-dereferencing-pmd.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/damon-use-pmdp_get-instead-of-drectly-dereferencing-pmd.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Levi Yun <ppbuk5246@xxxxxxxxx>
Subject: damon: use pmdp_get instead of drectly dereferencing pmd
Date: Fri, 28 Jul 2023 06:21:57 +0900
As ptep_get, Use the pmdp_get wrapper when we accessing pmdval instead of
directly dereferencing pmd.
Link: https://lkml.kernel.org/r/20230727212157.2985025-1-ppbuk5246@xxxxxxxxx
Signed-off-by: Levi Yun <ppbuk5246@xxxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/ops-common.c | 2 +-
mm/damon/paddr.c | 2 +-
mm/damon/vaddr.c | 23 +++++++++++++++--------
3 files changed, 17 insertions(+), 10 deletions(-)
--- a/mm/damon/ops-common.c~damon-use-pmdp_get-instead-of-drectly-dereferencing-pmd
+++ a/mm/damon/ops-common.c
@@ -54,7 +54,7 @@ void damon_ptep_mkold(pte_t *pte, struct
void damon_pmdp_mkold(pmd_t *pmd, struct vm_area_struct *vma, unsigned long addr)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- struct folio *folio = damon_get_folio(pmd_pfn(*pmd));
+ struct folio *folio = damon_get_folio(pmd_pfn(pmdp_get(pmd)));
if (!folio)
return;
--- a/mm/damon/paddr.c~damon-use-pmdp_get-instead-of-drectly-dereferencing-pmd
+++ a/mm/damon/paddr.c
@@ -94,7 +94,7 @@ static bool __damon_pa_young(struct foli
mmu_notifier_test_young(vma->vm_mm, addr);
} else {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- *accessed = pmd_young(*pvmw.pmd) ||
+ *accessed = pmd_young(pmdp_get(pvmw.pmd)) ||
!folio_test_idle(folio) ||
mmu_notifier_test_young(vma->vm_mm, addr);
#else
--- a/mm/damon/vaddr.c~damon-use-pmdp_get-instead-of-drectly-dereferencing-pmd
+++ a/mm/damon/vaddr.c
@@ -301,16 +301,19 @@ static int damon_mkold_pmd_entry(pmd_t *
unsigned long next, struct mm_walk *walk)
{
pte_t *pte;
+ pmd_t pmde;
spinlock_t *ptl;
- if (pmd_trans_huge(*pmd)) {
+ if (pmd_trans_huge(pmdp_get(pmd))) {
ptl = pmd_lock(walk->mm, pmd);
- if (!pmd_present(*pmd)) {
+ pmde = pmdp_get(pmd);
+
+ if (!pmd_present(pmde)) {
spin_unlock(ptl);
return 0;
}
- if (pmd_trans_huge(*pmd)) {
+ if (pmd_trans_huge(pmde)) {
damon_pmdp_mkold(pmd, walk->vma, addr);
spin_unlock(ptl);
return 0;
@@ -439,21 +442,25 @@ static int damon_young_pmd_entry(pmd_t *
struct damon_young_walk_private *priv = walk->private;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- if (pmd_trans_huge(*pmd)) {
+ if (pmd_trans_huge(pmdp_get(pmd))) {
+ pmd_t pmde;
+
ptl = pmd_lock(walk->mm, pmd);
- if (!pmd_present(*pmd)) {
+ pmde = pmdp_get(pmd);
+
+ if (!pmd_present(pmde)) {
spin_unlock(ptl);
return 0;
}
- if (!pmd_trans_huge(*pmd)) {
+ if (!pmd_trans_huge(pmde)) {
spin_unlock(ptl);
goto regular_page;
}
- folio = damon_get_folio(pmd_pfn(*pmd));
+ folio = damon_get_folio(pmd_pfn(pmde));
if (!folio)
goto huge_out;
- if (pmd_young(*pmd) || !folio_test_idle(folio) ||
+ if (pmd_young(pmde) || !folio_test_idle(folio) ||
mmu_notifier_test_young(walk->mm,
addr))
priv->young = true;
_
Patches currently in -mm which might be from ppbuk5246@xxxxxxxxx are
damon-use-pmdp_get-instead-of-drectly-dereferencing-pmd.patch
