[PATCH 12/33] mm: Create ptdesc equivalents for pgtable_{pte,pmd}_page_{ctor,dtor}

Vishal Moola (Oracle)
2023-04-17T20:53:36Z

Creates ptdesc_pte_ctor(), ptdesc_pmd_ctor(), ptdesc_pte_dtor(), and
ptdesc_pmd_dtor() and make the original pgtable constructor/destructors
wrappers.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
include/linux/mm.h | 56 ++++++++++++++++++++++++++++++++++------------
1 file changed, 42 insertions(+), 14 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 17a64cfd1430..cb136d2fdf74 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2847,20 +2847,34 @@ static inline bool ptlock_init(struct ptdesc *ptdesc) { return true; }
static inline void ptlock_free(struct ptdesc *ptdesc) {}
#endif /* USE_SPLIT_PTE_PTLOCKS */

-static inline bool pgtable_pte_page_ctor(struct page *page)
+static inline bool ptdesc_pte_ctor(struct ptdesc *ptdesc)
{
- if (!ptlock_init(page_ptdesc(page)))
+ struct folio *folio = ptdesc_folio(ptdesc);
+
+ if (!ptlock_init(ptdesc))
return false;
- __SetPageTable(page);
- inc_lruvec_page_state(page, NR_PAGETABLE);
+ __SetPageTable(&folio->page);
+ lruvec_stat_add_folio(folio, NR_PAGETABLE);
return true;
}

+static inline bool pgtable_pte_page_ctor(struct page *page)
+{
+ return ptdesc_pte_ctor(page_ptdesc(page));
+}
+
+static inline void ptdesc_pte_dtor(struct ptdesc *ptdesc)
+{
+ struct folio *folio = ptdesc_folio(ptdesc);
+
+ ptlock_free(ptdesc);
+ __ClearPageTable(&folio->page);
+ lruvec_stat_sub_folio(folio, NR_PAGETABLE);
+}
+
static inline void pgtable_pte_page_dtor(struct page *page)
{
- ptlock_free(page_ptdesc(page));
- __ClearPageTable(page);
- dec_lruvec_page_state(page, NR_PAGETABLE);
+ ptdesc_pte_dtor(page_ptdesc(page));
}

#define pte_offset_map_lock(mm, pmd, address, ptlp) \
@@ -2942,20 +2956,34 @@ static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd)
return ptl;
}

-static inline bool pgtable_pmd_page_ctor(struct page *page)
+static inline bool ptdesc_pmd_ctor(struct ptdesc *ptdesc)
{
- if (!pmd_ptlock_init(page_ptdesc(page)))
+ struct folio *folio = ptdesc_folio(ptdesc);
+
+ if (!pmd_ptlock_init(ptdesc))
return false;
- __SetPageTable(page);
- inc_lruvec_page_state(page, NR_PAGETABLE);
+ __SetPageTable(&folio->page);
+ lruvec_stat_add_folio(folio, NR_PAGETABLE);
return true;
}

+static inline bool pgtable_pmd_page_ctor(struct page *page)
+{
+ return ptdesc_pmd_ctor(page_ptdesc(page));
+}
+
+static inline void ptdesc_pmd_dtor(struct ptdesc *ptdesc)
+{
+ struct folio *folio = ptdesc_folio(ptdesc);
+
+ pmd_ptlock_free(ptdesc);
+ __ClearPageTable(&folio->page);
+ lruvec_stat_sub_folio(folio, NR_PAGETABLE);
+}
+
static inline void pgtable_pmd_page_dtor(struct page *page)
{
- pmd_ptlock_free(page_ptdesc(page));
- __ClearPageTable(page);
- dec_lruvec_page_state(page, NR_PAGETABLE);
+ ptdesc_pmd_dtor(page_ptdesc(page));
}

/*
--
2.39.2