linux-kernel - [PATCH mm-unstable v4 2/6] mm/mempolicy: convert queue_pages_pmd() to queue_folios

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Message-Id: <20230130201833.27042-3-vishal.moola@gmail.com>
Date:   Mon, 30 Jan 2023 12:18:29 -0800
From:   "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To:     linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: [PATCH mm-unstable v4 2/6] mm/mempolicy: convert queue_pages_pmd() to queue_folios_pmd()

The function now operates on a folio instead of the page associated with a
pmd.

This change is in preparation for the conversion of queue_pages_required()
to queue_folio_required() and migrate_page_add() to migrate_folio_add().

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
 mm/mempolicy.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 7686f40c9750..fc754dbcbbcd 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -442,21 +442,21 @@ static inline bool queue_pages_required(struct page *page,
 }
 
 /*
- * queue_pages_pmd() has three possible return values:
- * 0 - pages are placed on the right node or queued successfully, or
+ * queue_folios_pmd() has three possible return values:
+ * 0 - folios are placed on the right node or queued successfully, or
  *     special page is met, i.e. huge zero page.
- * 1 - there is unmovable page, and MPOL_MF_MOVE* & MPOL_MF_STRICT were
+ * 1 - there is unmovable folio, and MPOL_MF_MOVE* & MPOL_MF_STRICT were
  *     specified.
  * -EIO - is migration entry or only MPOL_MF_STRICT was specified and an
- *        existing page was already on a node that does not follow the
+ *        existing folio was already on a node that does not follow the
  *        policy.
  */
-static int queue_pages_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr,
+static int queue_folios_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr,
 				unsigned long end, struct mm_walk *walk)
 	__releases(ptl)
 {
 	int ret = 0;
-	struct page *page;
+	struct folio *folio;
 	struct queue_pages *qp = walk->private;
 	unsigned long flags;
 
@@ -464,19 +464,19 @@ static int queue_pages_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr,
 		ret = -EIO;
 		goto unlock;
 	}
-	page = pmd_page(*pmd);
-	if (is_huge_zero_page(page)) {
+	folio = pfn_folio(pmd_pfn(*pmd));
+	if (is_huge_zero_page(&folio->page)) {
 		walk->action = ACTION_CONTINUE;
 		goto unlock;
 	}
-	if (!queue_pages_required(page, qp))
+	if (!queue_pages_required(&folio->page, qp))
 		goto unlock;
 
 	flags = qp->flags;
-	/* go to thp migration */
+	/* go to folio migration */
 	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {
 		if (!vma_migratable(walk->vma) ||
-		    migrate_page_add(page, qp->pagelist, flags)) {
+		    migrate_page_add(&folio->page, qp->pagelist, flags)) {
 			ret = 1;
 			goto unlock;
 		}
@@ -512,7 +512,7 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
 
 	ptl = pmd_trans_huge_lock(pmd, vma);
 	if (ptl)
-		return queue_pages_pmd(pmd, ptl, addr, end, walk);
+		return queue_folios_pmd(pmd, ptl, addr, end, walk);
 
 	if (pmd_trans_unstable(pmd))
 		return 0;
-- 
2.38.1