linux-kernel - [PATCH v1 4/9] mm/memory: factor out zapping folio pte into zap_present_folio

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Date: Mon, 29 Jan 2024 15:32:16 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
	Nick Piggin <npiggin@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-s390@...r.kernel.org
Subject: [PATCH v1 4/9] mm/memory: factor out zapping folio pte into zap_present_folio_pte()

Let's prepare for further changes by factoring it out into a separate
function.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/memory.c | 53 ++++++++++++++++++++++++++++++++---------------------
 1 file changed, 32 insertions(+), 21 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 20bc13ab8db2..a2190d7cfa74 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1528,30 +1528,14 @@ zap_install_uffd_wp_if_needed(struct vm_area_struct *vma,
 	pte_install_uffd_wp_if_needed(vma, addr, pte, pteval);
 }
 
-static inline void zap_present_pte(struct mmu_gather *tlb,
-		struct vm_area_struct *vma, pte_t *pte, pte_t ptent,
-		unsigned long addr, struct zap_details *details,
-		int *rss, bool *force_flush, bool *force_break)
+static inline void zap_present_folio_pte(struct mmu_gather *tlb,
+		struct vm_area_struct *vma, struct folio *folio,
+		struct page *page, pte_t *pte, pte_t ptent, unsigned long addr,
+		struct zap_details *details, int *rss, bool *force_flush,
+		bool *force_break)
 {
 	struct mm_struct *mm = tlb->mm;
 	bool delay_rmap = false;
-	struct folio *folio;
-	struct page *page;
-
-	page = vm_normal_page(vma, addr, ptent);
-	if (!page) {
-		/* We don't need up-to-date accessed/dirty bits. */
-		ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm);
-		arch_check_zapped_pte(vma, ptent);
-		tlb_remove_tlb_entry(tlb, pte, addr);
-		VM_WARN_ON_ONCE(userfaultfd_wp(vma));
-		ksm_might_unmap_zero_page(mm, ptent);
-		return;
-	}
-
-	folio = page_folio(page);
-	if (unlikely(!should_zap_folio(details, folio)))
-		return;
 
 	if (!folio_test_anon(folio)) {
 		ptent = ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm);
@@ -1586,6 +1570,33 @@ static inline void zap_present_pte(struct mmu_gather *tlb,
 	}
 }
 
+static inline void zap_present_pte(struct mmu_gather *tlb,
+		struct vm_area_struct *vma, pte_t *pte, pte_t ptent,
+		unsigned long addr, struct zap_details *details,
+		int *rss, bool *force_flush, bool *force_break)
+{
+	struct mm_struct *mm = tlb->mm;
+	struct folio *folio;
+	struct page *page;
+
+	page = vm_normal_page(vma, addr, ptent);
+	if (!page) {
+		/* We don't need up-to-date accessed/dirty bits. */
+		ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm);
+		arch_check_zapped_pte(vma, ptent);
+		tlb_remove_tlb_entry(tlb, pte, addr);
+		VM_WARN_ON_ONCE(userfaultfd_wp(vma));
+		ksm_might_unmap_zero_page(mm, ptent);
+		return;
+	}
+
+	folio = page_folio(page);
+	if (unlikely(!should_zap_folio(details, folio)))
+		return;
+	zap_present_folio_pte(tlb, vma, folio, page, pte, ptent, addr, details,
+			      rss, force_flush, force_break);
+}
+
 static unsigned long zap_pte_range(struct mmu_gather *tlb,
 				struct vm_area_struct *vma, pmd_t *pmd,
 				unsigned long addr, unsigned long end,
-- 
2.43.0