[PATCH v3 07/17] mm: pgtable: introduce pagetable_dtor()

Qi Zheng zhengqi.arch at bytedance.com
Mon Dec 23 01:40:53 PST 2024


The pagetable_p*_dtor() are exactly the same except for the handling of
ptlock. If we make ptlock_free() handle the case where ptdesc->ptl is
NULL and remove VM_BUG_ON_PAGE() from pmd_ptlock_free(), we can unify
pagetable_p*_dtor() into one function. Let's introduce pagetable_dtor()
to do this.

Later, pagetable_dtor() will be moved to tlb_remove_ptdesc(), so that
ptlock and page table pages can be freed together (regardless of whether
RCU is used). This prevents the use-after-free problem where the ptlock
is freed immediately but the page table pages is freed later via RCU.

Signed-off-by: Qi Zheng <zhengqi.arch at bytedance.com>
Originally-by: Peter Zijlstra (Intel) <peterz at infradead.org>
---
 Documentation/mm/split_page_table_lock.rst |  4 +-
 arch/arm/include/asm/tlb.h                 |  4 +-
 arch/arm64/include/asm/tlb.h               |  8 ++--
 arch/csky/include/asm/pgalloc.h            |  2 +-
 arch/hexagon/include/asm/pgalloc.h         |  2 +-
 arch/loongarch/include/asm/pgalloc.h       |  2 +-
 arch/m68k/include/asm/mcf_pgalloc.h        |  4 +-
 arch/m68k/include/asm/sun3_pgalloc.h       |  2 +-
 arch/m68k/mm/motorola.c                    |  2 +-
 arch/mips/include/asm/pgalloc.h            |  2 +-
 arch/nios2/include/asm/pgalloc.h           |  2 +-
 arch/openrisc/include/asm/pgalloc.h        |  2 +-
 arch/powerpc/mm/book3s64/mmu_context.c     |  2 +-
 arch/powerpc/mm/book3s64/pgtable.c         |  2 +-
 arch/powerpc/mm/pgtable-frag.c             |  4 +-
 arch/riscv/include/asm/pgalloc.h           |  8 ++--
 arch/riscv/mm/init.c                       |  4 +-
 arch/s390/include/asm/pgalloc.h            |  6 +--
 arch/s390/include/asm/tlb.h                |  6 +--
 arch/s390/mm/pgalloc.c                     |  2 +-
 arch/sh/include/asm/pgalloc.h              |  2 +-
 arch/sparc/mm/init_64.c                    |  2 +-
 arch/sparc/mm/srmmu.c                      |  2 +-
 arch/um/include/asm/pgalloc.h              |  6 +--
 arch/x86/mm/pgtable.c                      | 12 ++---
 include/asm-generic/pgalloc.h              |  8 ++--
 include/linux/mm.h                         | 52 ++++------------------
 mm/memory.c                                |  3 +-
 28 files changed, 62 insertions(+), 95 deletions(-)

diff --git a/Documentation/mm/split_page_table_lock.rst b/Documentation/mm/split_page_table_lock.rst
index 581446d4a4eba..8e1ceb0a6619a 100644
--- a/Documentation/mm/split_page_table_lock.rst
+++ b/Documentation/mm/split_page_table_lock.rst
@@ -62,7 +62,7 @@ Support of split page table lock by an architecture
 ===================================================
 
 There's no need in special enabling of PTE split page table lock: everything
-required is done by pagetable_pte_ctor() and pagetable_pte_dtor(), which
+required is done by pagetable_pte_ctor() and pagetable_dtor(), which
 must be called on PTE table allocation / freeing.
 
 Make sure the architecture doesn't use slab allocator for page table
@@ -73,7 +73,7 @@ PMD split lock only makes sense if you have more than two page table
 levels.
 
 PMD split lock enabling requires pagetable_pmd_ctor() call on PMD table
-allocation and pagetable_pmd_dtor() on freeing.
+allocation and pagetable_dtor() on freeing.
 
 Allocation usually happens in pmd_alloc_one(), freeing in pmd_free() and
 pmd_free_tlb(), but make sure you cover all PMD table allocation / freeing
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
index f40d06ad5d2a3..ef79bf1e8563f 100644
--- a/arch/arm/include/asm/tlb.h
+++ b/arch/arm/include/asm/tlb.h
@@ -41,7 +41,7 @@ __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
 {
 	struct ptdesc *ptdesc = page_ptdesc(pte);
 
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 
 #ifndef CONFIG_ARM_LPAE
 	/*
@@ -61,7 +61,7 @@ __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
 #ifdef CONFIG_ARM_LPAE
 	struct ptdesc *ptdesc = virt_to_ptdesc(pmdp);
 
-	pagetable_pmd_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	tlb_remove_ptdesc(tlb, ptdesc);
 #endif
 }
diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h
index 445282cde9afb..408d0f36a8a8f 100644
--- a/arch/arm64/include/asm/tlb.h
+++ b/arch/arm64/include/asm/tlb.h
@@ -82,7 +82,7 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
 {
 	struct ptdesc *ptdesc = page_ptdesc(pte);
 
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	tlb_remove_ptdesc(tlb, ptdesc);
 }
 
@@ -92,7 +92,7 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
 {
 	struct ptdesc *ptdesc = virt_to_ptdesc(pmdp);
 
-	pagetable_pmd_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	tlb_remove_ptdesc(tlb, ptdesc);
 }
 #endif
@@ -106,7 +106,7 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
 	if (!pgtable_l4_enabled())
 		return;
 
-	pagetable_pud_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	tlb_remove_ptdesc(tlb, ptdesc);
 }
 #endif
@@ -120,7 +120,7 @@ static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4dp,
 	if (!pgtable_l5_enabled())
 		return;
 
-	pagetable_p4d_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	tlb_remove_ptdesc(tlb, ptdesc);
 }
 #endif
diff --git a/arch/csky/include/asm/pgalloc.h b/arch/csky/include/asm/pgalloc.h
index 9c84c9012e534..f1ce5b7b28f22 100644
--- a/arch/csky/include/asm/pgalloc.h
+++ b/arch/csky/include/asm/pgalloc.h
@@ -63,7 +63,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 
 #define __pte_free_tlb(tlb, pte, address)		\
 do {							\
-	pagetable_pte_dtor(page_ptdesc(pte));		\
+	pagetable_dtor(page_ptdesc(pte));		\
 	tlb_remove_page_ptdesc(tlb, page_ptdesc(pte));	\
 } while (0)
 
diff --git a/arch/hexagon/include/asm/pgalloc.h b/arch/hexagon/include/asm/pgalloc.h
index 55988625e6fbc..40e42a0e71673 100644
--- a/arch/hexagon/include/asm/pgalloc.h
+++ b/arch/hexagon/include/asm/pgalloc.h
@@ -89,7 +89,7 @@ static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 
 #define __pte_free_tlb(tlb, pte, addr)				\
 do {								\
-	pagetable_pte_dtor((page_ptdesc(pte)));			\
+	pagetable_dtor((page_ptdesc(pte)));			\
 	tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte)));	\
 } while (0)
 
diff --git a/arch/loongarch/include/asm/pgalloc.h b/arch/loongarch/include/asm/pgalloc.h
index a7b9c9e73593d..7211dff8c969e 100644
--- a/arch/loongarch/include/asm/pgalloc.h
+++ b/arch/loongarch/include/asm/pgalloc.h
@@ -57,7 +57,7 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
 
 #define __pte_free_tlb(tlb, pte, address)			\
 do {								\
-	pagetable_pte_dtor(page_ptdesc(pte));			\
+	pagetable_dtor(page_ptdesc(pte));			\
 	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));	\
 } while (0)
 
diff --git a/arch/m68k/include/asm/mcf_pgalloc.h b/arch/m68k/include/asm/mcf_pgalloc.h
index 302c5bf67179e..22d6c1fcabfb4 100644
--- a/arch/m68k/include/asm/mcf_pgalloc.h
+++ b/arch/m68k/include/asm/mcf_pgalloc.h
@@ -37,7 +37,7 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
 {
 	struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
 
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 
@@ -61,7 +61,7 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
 {
 	struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
 
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 
diff --git a/arch/m68k/include/asm/sun3_pgalloc.h b/arch/m68k/include/asm/sun3_pgalloc.h
index 4a137eecb6fe4..2b626cb3ad0ae 100644
--- a/arch/m68k/include/asm/sun3_pgalloc.h
+++ b/arch/m68k/include/asm/sun3_pgalloc.h
@@ -19,7 +19,7 @@ extern const char bad_pmd_string[];
 
 #define __pte_free_tlb(tlb, pte, addr)				\
 do {								\
-	pagetable_pte_dtor(page_ptdesc(pte));			\
+	pagetable_dtor(page_ptdesc(pte));			\
 	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));	\
 } while (0)
 
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index c1761d309fc61..81715cece70c6 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -201,7 +201,7 @@ int free_pointer_table(void *table, int type)
 		list_del(dp);
 		mmu_page_dtor((void *)page);
 		if (type == TABLE_PTE)
-			pagetable_pte_dtor(virt_to_ptdesc((void *)page));
+			pagetable_dtor(virt_to_ptdesc((void *)page));
 		free_page (page);
 		return 1;
 	} else if (ptable_list[type].next != dp) {
diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h
index f4440edcd8fe2..36d9805033c4b 100644
--- a/arch/mips/include/asm/pgalloc.h
+++ b/arch/mips/include/asm/pgalloc.h
@@ -56,7 +56,7 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 
 #define __pte_free_tlb(tlb, pte, address)			\
 do {								\
-	pagetable_pte_dtor(page_ptdesc(pte));			\
+	pagetable_dtor(page_ptdesc(pte));			\
 	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));	\
 } while (0)
 
diff --git a/arch/nios2/include/asm/pgalloc.h b/arch/nios2/include/asm/pgalloc.h
index ce6bb8e74271f..12a536b7bfbd4 100644
--- a/arch/nios2/include/asm/pgalloc.h
+++ b/arch/nios2/include/asm/pgalloc.h
@@ -30,7 +30,7 @@ extern pgd_t *pgd_alloc(struct mm_struct *mm);
 
 #define __pte_free_tlb(tlb, pte, addr)					\
 	do {								\
-		pagetable_pte_dtor(page_ptdesc(pte));			\
+		pagetable_dtor(page_ptdesc(pte));			\
 		tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte)));	\
 	} while (0)
 
diff --git a/arch/openrisc/include/asm/pgalloc.h b/arch/openrisc/include/asm/pgalloc.h
index c6a73772a5466..596e2355824e3 100644
--- a/arch/openrisc/include/asm/pgalloc.h
+++ b/arch/openrisc/include/asm/pgalloc.h
@@ -68,7 +68,7 @@ extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
 
 #define __pte_free_tlb(tlb, pte, addr)				\
 do {								\
-	pagetable_pte_dtor(page_ptdesc(pte));			\
+	pagetable_dtor(page_ptdesc(pte));			\
 	tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte)));	\
 } while (0)
 
diff --git a/arch/powerpc/mm/book3s64/mmu_context.c b/arch/powerpc/mm/book3s64/mmu_context.c
index 1715b07c630c9..4e1e45420bd49 100644
--- a/arch/powerpc/mm/book3s64/mmu_context.c
+++ b/arch/powerpc/mm/book3s64/mmu_context.c
@@ -253,7 +253,7 @@ static void pmd_frag_destroy(void *pmd_frag)
 	count = ((unsigned long)pmd_frag & ~PAGE_MASK) >> PMD_FRAG_SIZE_SHIFT;
 	/* We allow PTE_FRAG_NR fragments from a PTE page */
 	if (atomic_sub_and_test(PMD_FRAG_NR - count, &ptdesc->pt_frag_refcount)) {
-		pagetable_pmd_dtor(ptdesc);
+		pagetable_dtor(ptdesc);
 		pagetable_free(ptdesc);
 	}
 }
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 3745425280808..3f28e4acd920b 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -477,7 +477,7 @@ void pmd_fragment_free(unsigned long *pmd)
 
 	BUG_ON(atomic_read(&ptdesc->pt_frag_refcount) <= 0);
 	if (atomic_dec_and_test(&ptdesc->pt_frag_refcount)) {
-		pagetable_pmd_dtor(ptdesc);
+		pagetable_dtor(ptdesc);
 		pagetable_free(ptdesc);
 	}
 }
diff --git a/arch/powerpc/mm/pgtable-frag.c b/arch/powerpc/mm/pgtable-frag.c
index e89f64a0f24ae..713268ccb1a0e 100644
--- a/arch/powerpc/mm/pgtable-frag.c
+++ b/arch/powerpc/mm/pgtable-frag.c
@@ -25,7 +25,7 @@ void pte_frag_destroy(void *pte_frag)
 	count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT;
 	/* We allow PTE_FRAG_NR fragments from a PTE page */
 	if (atomic_sub_and_test(PTE_FRAG_NR - count, &ptdesc->pt_frag_refcount)) {
-		pagetable_pte_dtor(ptdesc);
+		pagetable_dtor(ptdesc);
 		pagetable_free(ptdesc);
 	}
 }
@@ -111,7 +111,7 @@ static void pte_free_now(struct rcu_head *head)
 	struct ptdesc *ptdesc;
 
 	ptdesc = container_of(head, struct ptdesc, pt_rcu_head);
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 
diff --git a/arch/riscv/include/asm/pgalloc.h b/arch/riscv/include/asm/pgalloc.h
index 3466fbe2e508d..b6793c5c99296 100644
--- a/arch/riscv/include/asm/pgalloc.h
+++ b/arch/riscv/include/asm/pgalloc.h
@@ -100,7 +100,7 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 	if (pgtable_l4_enabled) {
 		struct ptdesc *ptdesc = virt_to_ptdesc(pud);
 
-		pagetable_pud_dtor(ptdesc);
+		pagetable_dtor(ptdesc);
 		riscv_tlb_remove_ptdesc(tlb, ptdesc);
 	}
 }
@@ -111,7 +111,7 @@ static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
 	if (pgtable_l5_enabled) {
 		struct ptdesc *ptdesc = virt_to_ptdesc(p4d);
 
-		pagetable_p4d_dtor(ptdesc);
+		pagetable_dtor(ptdesc);
 		riscv_tlb_remove_ptdesc(tlb, virt_to_ptdesc(p4d));
 	}
 }
@@ -144,7 +144,7 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 {
 	struct ptdesc *ptdesc = virt_to_ptdesc(pmd);
 
-	pagetable_pmd_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	riscv_tlb_remove_ptdesc(tlb, ptdesc);
 }
 
@@ -155,7 +155,7 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
 {
 	struct ptdesc *ptdesc = page_ptdesc(pte);
 
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	riscv_tlb_remove_ptdesc(tlb, ptdesc);
 }
 #endif /* CONFIG_MMU */
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index fc53ce748c804..8d703fb51b1dc 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -1558,7 +1558,7 @@ static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
 			return;
 	}
 
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	if (PageReserved(page))
 		free_reserved_page(page);
 	else
@@ -1580,7 +1580,7 @@ static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud, bool is_vmemm
 	}
 
 	if (!is_vmemmap)
-		pagetable_pmd_dtor(ptdesc);
+		pagetable_dtor(ptdesc);
 	if (PageReserved(page))
 		free_reserved_page(page);
 	else
diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
index a0c1ca5d8423c..5fced6d3c36b0 100644
--- a/arch/s390/include/asm/pgalloc.h
+++ b/arch/s390/include/asm/pgalloc.h
@@ -66,7 +66,7 @@ static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
 	if (mm_p4d_folded(mm))
 		return;
 
-	pagetable_p4d_dtor(virt_to_ptdesc(p4d));
+	pagetable_dtor(virt_to_ptdesc(p4d));
 	crst_table_free(mm, (unsigned long *) p4d);
 }
 
@@ -87,7 +87,7 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 	if (mm_pud_folded(mm))
 		return;
 
-	pagetable_pud_dtor(virt_to_ptdesc(pud));
+	pagetable_dtor(virt_to_ptdesc(pud));
 	crst_table_free(mm, (unsigned long *) pud);
 }
 
@@ -109,7 +109,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 {
 	if (mm_pmd_folded(mm))
 		return;
-	pagetable_pmd_dtor(virt_to_ptdesc(pmd));
+	pagetable_dtor(virt_to_ptdesc(pmd));
 	crst_table_free(mm, (unsigned long *) pmd);
 }
 
diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index b946964afce8e..74b6fba4c2ee3 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -102,7 +102,7 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 {
 	if (mm_pmd_folded(tlb->mm))
 		return;
-	pagetable_pmd_dtor(virt_to_ptdesc(pmd));
+	pagetable_dtor(virt_to_ptdesc(pmd));
 	__tlb_adjust_range(tlb, address, PAGE_SIZE);
 	tlb->mm->context.flush_mm = 1;
 	tlb->freed_tables = 1;
@@ -122,7 +122,7 @@ static inline void pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 {
 	if (mm_pud_folded(tlb->mm))
 		return;
-	pagetable_pud_dtor(virt_to_ptdesc(pud));
+	pagetable_dtor(virt_to_ptdesc(pud));
 	tlb->mm->context.flush_mm = 1;
 	tlb->freed_tables = 1;
 	tlb->cleared_p4ds = 1;
@@ -141,7 +141,7 @@ static inline void p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
 {
 	if (mm_p4d_folded(tlb->mm))
 		return;
-	pagetable_p4d_dtor(virt_to_ptdesc(p4d));
+	pagetable_dtor(virt_to_ptdesc(p4d));
 	__tlb_adjust_range(tlb, address, PAGE_SIZE);
 	tlb->mm->context.flush_mm = 1;
 	tlb->freed_tables = 1;
diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c
index 58696a0c4e4ac..569de24d33761 100644
--- a/arch/s390/mm/pgalloc.c
+++ b/arch/s390/mm/pgalloc.c
@@ -182,7 +182,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
 
 static void pagetable_pte_dtor_free(struct ptdesc *ptdesc)
 {
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 
diff --git a/arch/sh/include/asm/pgalloc.h b/arch/sh/include/asm/pgalloc.h
index 5d8577ab15911..96d938fdf2244 100644
--- a/arch/sh/include/asm/pgalloc.h
+++ b/arch/sh/include/asm/pgalloc.h
@@ -34,7 +34,7 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 
 #define __pte_free_tlb(tlb, pte, addr)				\
 do {								\
-	pagetable_pte_dtor(page_ptdesc(pte));			\
+	pagetable_dtor(page_ptdesc(pte));			\
 	tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte)));	\
 } while (0)
 
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 21f8cbbd0581c..05882bca5b732 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2915,7 +2915,7 @@ static void __pte_free(pgtable_t pte)
 {
 	struct ptdesc *ptdesc = virt_to_ptdesc(pte);
 
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index 9df51a62333d6..e3a72c884b867 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -372,7 +372,7 @@ void pte_free(struct mm_struct *mm, pgtable_t ptep)
 	page = pfn_to_page(__nocache_pa((unsigned long)ptep) >> PAGE_SHIFT);
 	spin_lock(&mm->page_table_lock);
 	if (page_ref_dec_return(page) == 1)
-		pagetable_pte_dtor(page_ptdesc(page));
+		pagetable_dtor(page_ptdesc(page));
 	spin_unlock(&mm->page_table_lock);
 
 	srmmu_free_nocache(ptep, SRMMU_PTE_TABLE_SIZE);
diff --git a/arch/um/include/asm/pgalloc.h b/arch/um/include/asm/pgalloc.h
index 04fb4e6969a46..f0af23c3aeb2b 100644
--- a/arch/um/include/asm/pgalloc.h
+++ b/arch/um/include/asm/pgalloc.h
@@ -27,7 +27,7 @@ extern pgd_t *pgd_alloc(struct mm_struct *);
 
 #define __pte_free_tlb(tlb, pte, address)			\
 do {								\
-	pagetable_pte_dtor(page_ptdesc(pte));			\
+	pagetable_dtor(page_ptdesc(pte));			\
 	tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte)));	\
 } while (0)
 
@@ -35,7 +35,7 @@ do {								\
 
 #define __pmd_free_tlb(tlb, pmd, address)			\
 do {								\
-	pagetable_pmd_dtor(virt_to_ptdesc(pmd));			\
+	pagetable_dtor(virt_to_ptdesc(pmd));			\
 	tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pmd));	\
 } while (0)
 
@@ -43,7 +43,7 @@ do {								\
 
 #define __pud_free_tlb(tlb, pud, address)			\
 do {								\
-	pagetable_pud_dtor(virt_to_ptdesc(pud));		\
+	pagetable_dtor(virt_to_ptdesc(pud));		\
 	tlb_remove_page_ptdesc((tlb), virt_to_ptdesc(pud));	\
 } while (0)
 
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 3d6e84da45b24..a6cd9660e29ec 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -60,7 +60,7 @@ early_param("userpte", setup_userpte);
 
 void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
 {
-	pagetable_pte_dtor(page_ptdesc(pte));
+	pagetable_dtor(page_ptdesc(pte));
 	paravirt_release_pte(page_to_pfn(pte));
 	paravirt_tlb_remove_table(tlb, pte);
 }
@@ -77,7 +77,7 @@ void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
 #ifdef CONFIG_X86_PAE
 	tlb->need_flush_all = 1;
 #endif
-	pagetable_pmd_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	paravirt_tlb_remove_table(tlb, ptdesc_page(ptdesc));
 }
 
@@ -86,7 +86,7 @@ void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
 {
 	struct ptdesc *ptdesc = virt_to_ptdesc(pud);
 
-	pagetable_pud_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	paravirt_release_pud(__pa(pud) >> PAGE_SHIFT);
 	paravirt_tlb_remove_table(tlb, virt_to_page(pud));
 }
@@ -96,7 +96,7 @@ void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d)
 {
 	struct ptdesc *ptdesc = virt_to_ptdesc(p4d);
 
-	pagetable_p4d_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	paravirt_release_p4d(__pa(p4d) >> PAGE_SHIFT);
 	paravirt_tlb_remove_table(tlb, virt_to_page(p4d));
 }
@@ -233,7 +233,7 @@ static void free_pmds(struct mm_struct *mm, pmd_t *pmds[], int count)
 		if (pmds[i]) {
 			ptdesc = virt_to_ptdesc(pmds[i]);
 
-			pagetable_pmd_dtor(ptdesc);
+			pagetable_dtor(ptdesc);
 			pagetable_free(ptdesc);
 			mm_dec_nr_pmds(mm);
 		}
@@ -867,7 +867,7 @@ int pud_free_pmd_page(pud_t *pud, unsigned long addr)
 
 	free_page((unsigned long)pmd_sv);
 
-	pagetable_pmd_dtor(virt_to_ptdesc(pmd));
+	pagetable_dtor(virt_to_ptdesc(pmd));
 	free_page((unsigned long)pmd);
 
 	return 1;
diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h
index bb482eeca0c3e..4afb346eae255 100644
--- a/include/asm-generic/pgalloc.h
+++ b/include/asm-generic/pgalloc.h
@@ -109,7 +109,7 @@ static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
 {
 	struct ptdesc *ptdesc = page_ptdesc(pte_page);
 
-	pagetable_pte_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 
@@ -153,7 +153,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 	struct ptdesc *ptdesc = virt_to_ptdesc(pmd);
 
 	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
-	pagetable_pmd_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 #endif
@@ -202,7 +202,7 @@ static inline void __pud_free(struct mm_struct *mm, pud_t *pud)
 	struct ptdesc *ptdesc = virt_to_ptdesc(pud);
 
 	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
-	pagetable_pud_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 
@@ -248,7 +248,7 @@ static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
 	struct ptdesc *ptdesc = virt_to_ptdesc(p4d);
 
 	BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
-	pagetable_p4d_dtor(ptdesc);
+	pagetable_dtor(ptdesc);
 	pagetable_free(ptdesc);
 }
 
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5d82f42ddd5cc..cad11fa10c192 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2992,6 +2992,15 @@ 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 void pagetable_dtor(struct ptdesc *ptdesc)
+{
+	struct folio *folio = ptdesc_folio(ptdesc);
+
+	ptlock_free(ptdesc);
+	__folio_clear_pgtable(folio);
+	lruvec_stat_sub_folio(folio, NR_PAGETABLE);
+}
+
 static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc)
 {
 	struct folio *folio = ptdesc_folio(ptdesc);
@@ -3003,15 +3012,6 @@ static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc)
 	return true;
 }
 
-static inline void pagetable_pte_dtor(struct ptdesc *ptdesc)
-{
-	struct folio *folio = ptdesc_folio(ptdesc);
-
-	ptlock_free(ptdesc);
-	__folio_clear_pgtable(folio);
-	lruvec_stat_sub_folio(folio, NR_PAGETABLE);
-}
-
 pte_t *___pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp);
 static inline pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr,
 			pmd_t *pmdvalp)
@@ -3088,14 +3088,6 @@ static inline bool pmd_ptlock_init(struct ptdesc *ptdesc)
 	return ptlock_init(ptdesc);
 }
 
-static inline void pmd_ptlock_free(struct ptdesc *ptdesc)
-{
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	VM_BUG_ON_PAGE(ptdesc->pmd_huge_pte, ptdesc_page(ptdesc));
-#endif
-	ptlock_free(ptdesc);
-}
-
 #define pmd_huge_pte(mm, pmd) (pmd_ptdesc(pmd)->pmd_huge_pte)
 
 #else
@@ -3106,7 +3098,6 @@ static inline spinlock_t *pmd_lockptr(struct mm_struct *mm, pmd_t *pmd)
 }
 
 static inline bool pmd_ptlock_init(struct ptdesc *ptdesc) { return true; }
-static inline void pmd_ptlock_free(struct ptdesc *ptdesc) {}
 
 #define pmd_huge_pte(mm, pmd) ((mm)->pmd_huge_pte)
 
@@ -3131,15 +3122,6 @@ static inline bool pagetable_pmd_ctor(struct ptdesc *ptdesc)
 	return true;
 }
 
-static inline void pagetable_pmd_dtor(struct ptdesc *ptdesc)
-{
-	struct folio *folio = ptdesc_folio(ptdesc);
-
-	pmd_ptlock_free(ptdesc);
-	__folio_clear_pgtable(folio);
-	lruvec_stat_sub_folio(folio, NR_PAGETABLE);
-}
-
 /*
  * No scalability reason to split PUD locks yet, but follow the same pattern
  * as the PMD locks to make it easier if we decide to.  The VM should not be
@@ -3167,14 +3149,6 @@ static inline void pagetable_pud_ctor(struct ptdesc *ptdesc)
 	lruvec_stat_add_folio(folio, NR_PAGETABLE);
 }
 
-static inline void pagetable_pud_dtor(struct ptdesc *ptdesc)
-{
-	struct folio *folio = ptdesc_folio(ptdesc);
-
-	__folio_clear_pgtable(folio);
-	lruvec_stat_sub_folio(folio, NR_PAGETABLE);
-}
-
 static inline void pagetable_p4d_ctor(struct ptdesc *ptdesc)
 {
 	struct folio *folio = ptdesc_folio(ptdesc);
@@ -3183,14 +3157,6 @@ static inline void pagetable_p4d_ctor(struct ptdesc *ptdesc)
 	lruvec_stat_add_folio(folio, NR_PAGETABLE);
 }
 
-static inline void pagetable_p4d_dtor(struct ptdesc *ptdesc)
-{
-	struct folio *folio = ptdesc_folio(ptdesc);
-
-	__folio_clear_pgtable(folio);
-	lruvec_stat_sub_folio(folio, NR_PAGETABLE);
-}
-
 extern void __init pagecache_init(void);
 extern void free_initmem(void);
 
diff --git a/mm/memory.c b/mm/memory.c
index 9423967b24180..ad871e564568b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -7051,7 +7051,8 @@ bool ptlock_alloc(struct ptdesc *ptdesc)
 
 void ptlock_free(struct ptdesc *ptdesc)
 {
-	kmem_cache_free(page_ptl_cachep, ptdesc->ptl);
+	if (ptdesc->ptl)
+		kmem_cache_free(page_ptl_cachep, ptdesc->ptl);
 }
 #endif
 
-- 
2.20.1




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