linux-kernel - [PATCH v2 04/10] mm: huge_memory: use a folio in zap_huge

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Date:   Sat, 4 Nov 2023 11:55:16 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        <linux-s390@...r.kernel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v2 04/10] mm: huge_memory: use a folio in zap_huge_pmd()

Use a folio in zap_huge_pmd(), which is a preparetion for
converting mm counter functions to take a folio.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 mm/huge_memory.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 34dd01970927..78a00fe22c2d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1716,11 +1716,13 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 		zap_deposited_table(tlb->mm, pmd);
 		spin_unlock(ptl);
 	} else {
-		struct page *page = NULL;
+		struct folio *folio = NULL;
 		int flush_needed = 1;
 
 		if (pmd_present(orig_pmd)) {
-			page = pmd_page(orig_pmd);
+			struct page *page = pmd_page(orig_pmd);
+
+			folio = page_folio(page);
 			page_remove_rmap(page, vma, true);
 			VM_BUG_ON_PAGE(page_mapcount(page) < 0, page);
 			VM_BUG_ON_PAGE(!PageHead(page), page);
@@ -1729,12 +1731,12 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 
 			VM_BUG_ON(!is_pmd_migration_entry(orig_pmd));
 			entry = pmd_to_swp_entry(orig_pmd);
-			page = pfn_swap_entry_to_page(entry);
+			folio = pfn_swap_entry_to_folio(entry);
 			flush_needed = 0;
 		} else
 			WARN_ONCE(1, "Non present huge pmd without pmd migration enabled!");
 
-		if (PageAnon(page)) {
+		if (folio_test_anon(folio)) {
 			zap_deposited_table(tlb->mm, pmd);
 			add_mm_counter(tlb->mm, MM_ANONPAGES, -HPAGE_PMD_NR);
 		} else {
@@ -1745,7 +1747,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 
 		spin_unlock(ptl);
 		if (flush_needed)
-			tlb_remove_page_size(tlb, page, HPAGE_PMD_SIZE);
+			tlb_remove_page_size(tlb, &folio->page, HPAGE_PMD_SIZE);
 	}
 	return 1;
 }
-- 
2.27.0