From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Mon, 8 Sep 2025 17:11:01 +0000 (+0100)
Subject: ptdesc: remove references to folios from __pagetable_ctor() and pagetable_dtor()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=4f8ea59dcec30aba8e063e4d62583e52bd7f4c1c;p=users%2Fjedix%2Flinux-maple.git

ptdesc: remove references to folios from __pagetable_ctor() and pagetable_dtor()

In preparation for splitting struct ptdesc from struct page and struct
folio, remove mentions of struct folio from these functions.  Introduce
ptdesc_nr_pages() to avoid using lruvec_stat_add/sub_folio()

Link: https://lkml.kernel.org/r/20250908171104.2409217-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8dd71392eba7..25f56e209ec8 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2097,9 +2097,9 @@ static inline long folio_nr_pages(const struct folio *folio)
  * page.  compound_nr() can be called on a tail page, and is defined to
  * return 1 in that case.
  */
-static inline long compound_nr(struct page *page)
+static inline long compound_nr(const struct page *page)
 {
-	struct folio *folio = (struct folio *)page;
+	const struct folio *folio = (struct folio *)page;
 
 	if (!test_bit(PG_head, &folio->flags.f))
 		return 1;
@@ -3066,21 +3066,26 @@ static inline bool ptlock_init(struct ptdesc *ptdesc) { return true; }
 static inline void ptlock_free(struct ptdesc *ptdesc) {}
 #endif /* defined(CONFIG_SPLIT_PTE_PTLOCKS) */
 
+static inline unsigned long ptdesc_nr_pages(const struct ptdesc *ptdesc)
+{
+	return compound_nr(ptdesc_page(ptdesc));
+}
+
 static inline void __pagetable_ctor(struct ptdesc *ptdesc)
 {
-	struct folio *folio = ptdesc_folio(ptdesc);
+	pg_data_t *pgdat = NODE_DATA(memdesc_nid(ptdesc->pt_flags));
 
-	__folio_set_pgtable(folio);
-	lruvec_stat_add_folio(folio, NR_PAGETABLE);
+	__SetPageTable(ptdesc_page(ptdesc));
+	mod_node_page_state(pgdat, NR_PAGETABLE, ptdesc_nr_pages(ptdesc));
 }
 
 static inline void pagetable_dtor(struct ptdesc *ptdesc)
 {
-	struct folio *folio = ptdesc_folio(ptdesc);
+	pg_data_t *pgdat = NODE_DATA(memdesc_nid(ptdesc->pt_flags));
 
 	ptlock_free(ptdesc);
-	__folio_clear_pgtable(folio);
-	lruvec_stat_sub_folio(folio, NR_PAGETABLE);
+	__ClearPageTable(ptdesc_page(ptdesc));
+	mod_node_page_state(pgdat, NR_PAGETABLE, -ptdesc_nr_pages(ptdesc));
 }
 
 static inline void pagetable_dtor_free(struct ptdesc *ptdesc)