From b4e6f66e45b43aed0903731b6c0700573f88282a Mon Sep 17 00:00:00 2001
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: Fri, 2 Sep 2022 20:46:41 +0100
Subject: [PATCH] ksm: use a folio in replace_page()
Replace three calls to compound_head() with one.
Link: https://lkml.kernel.org/r/20220902194653.1739778-46-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/ksm.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/mm/ksm.c b/mm/ksm.c
index c3edb5836a441..c19fcca9bc03d 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1110,6 +1110,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
struct page *kpage, pte_t orig_pte)
{
struct mm_struct *mm = vma->vm_mm;
+ struct folio *folio;
pmd_t *pmd;
pmd_t pmde;
pte_t *ptep;
@@ -1178,10 +1179,11 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
ptep_clear_flush(vma, addr, ptep);
set_pte_at_notify(mm, addr, ptep, newpte);
+ folio = page_folio(page);
page_remove_rmap(page, vma, false);
- if (!page_mapped(page))
- try_to_free_swap(page);
- put_page(page);
+ if (!folio_mapped(folio))
+ folio_free_swap(folio);
+ folio_put(folio);
pte_unmap_unlock(ptep, ptl);
err = 0;
--
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