[tip: x86/mm] x86/mm: Convert pgd_page_get_mm() to ptdescs

["tip-bot2 for Vishal Moola" <tip-bot2@linutronix.de>]

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     dd9850c91665a56babd964df19de2cb90a98c538
Gitweb:        https://git.kernel.org/tip/dd9850c91665a56babd964df19de2cb90a98c538
Author:        Vishal Moola <vishal.moola@gmail.com>
AuthorDate:    Mon, 29 Jun 2026 11:57:40 -07:00
Committer:     Dave Hansen <dave.hansen@linux.intel.com>
CommitterDate: Mon, 13 Jul 2026 15:55:10 -07:00

x86/mm: Convert pgd_page_get_mm() to ptdescs

Convert pgd_page_get_mm() to ptdescs. Define struct ptdesc in our
pgtable_types so that our declarations recognize ptdesc as an
appropriate page table type.

Now that all callers are using ptdescs, we can pass in that
ptdesc to get the underlying mm_struct.

Signed-off-by: Vishal Moola <vishal.moola@gmail.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: William Kucharski <william.kucharski@linux.dev>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Link: https://patch.msgid.link/20260629185742.126987-8-vishal.moola@gmail.com
---
 arch/x86/include/asm/pgtable.h       | 2 +-
 arch/x86/include/asm/pgtable_types.h | 2 +-
 arch/x86/mm/fault.c                  | 2 +-
 arch/x86/mm/init_64.c                | 4 ++--
 arch/x86/mm/pgtable.c                | 4 ++--
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index ac295ca..dd046f2 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -50,7 +50,7 @@ void ptdump_walk_user_pgd_level_checkwx(void);
 extern spinlock_t pgd_lock;
 extern struct list_head pgd_list;
 
-extern struct mm_struct *pgd_page_get_mm(struct page *page);
+struct mm_struct *pgd_page_get_mm(struct ptdesc *pt);
 
 extern pmdval_t early_pmd_flags;
 
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index 2ec250b..95c7f45 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -512,7 +512,7 @@ static inline pgprot_t pgprot_large_2_4k(pgprot_t pgprot)
 	return __pgprot(protval_large_2_4k(pgprot_val(pgprot)));
 }
 
-
+struct ptdesc;
 typedef struct page *pgtable_t;
 
 extern pteval_t __supported_pte_mask;
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index c31ffea..aa88370 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -282,7 +282,7 @@ void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
 			spinlock_t *pgt_lock;
 
 			/* the pgt_lock only for Xen */
-			pgt_lock = &pgd_page_get_mm(ptdesc_page(ptdesc))->page_table_lock;
+			pgt_lock = &pgd_page_get_mm(ptdesc)->page_table_lock;
 
 			spin_lock(pgt_lock);
 			vmalloc_sync_one(ptdesc_address(ptdesc), addr);
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 1441f5f..bf529a9 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -152,7 +152,7 @@ static void sync_global_pgds_l5(unsigned long start, unsigned long end)
 
 			pgd = (pgd_t *)ptdesc_address(ptdesc) + pgd_index(addr);
 			/* the pgt_lock only for Xen */
-			pgt_lock = &pgd_page_get_mm(ptdesc_page(ptdesc))->page_table_lock;
+			pgt_lock = &pgd_page_get_mm(ptdesc)->page_table_lock;
 			spin_lock(pgt_lock);
 
 			if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
@@ -195,7 +195,7 @@ static void sync_global_pgds_l4(unsigned long start, unsigned long end)
 			pgd = (pgd_t *)ptdesc_address(ptdesc) + pgd_index(addr);
 			p4d = p4d_offset(pgd, addr);
 			/* the pgt_lock only for Xen */
-			pgt_lock = &pgd_page_get_mm(ptdesc_page(ptdesc))->page_table_lock;
+			pgt_lock = &pgd_page_get_mm(ptdesc)->page_table_lock;
 			spin_lock(pgt_lock);
 
 			if (!p4d_none(*p4d_ref) && !p4d_none(*p4d))
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index f32facd..cb03f5a 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -74,9 +74,9 @@ static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm)
 	virt_to_ptdesc(pgd)->pt_mm = mm;
 }
 
-struct mm_struct *pgd_page_get_mm(struct page *page)
+struct mm_struct *pgd_page_get_mm(struct ptdesc *pt)
 {
-	return page_ptdesc(page)->pt_mm;
+	return pt->pt_mm;
 }
 
 static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd)