linux-kernel - [PATCH 04/10] s390/mm: Add calls to pagetable_pud

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Message-ID: <20241219164425.2277022-5-kevin.brodsky@arm.com>
Date: Thu, 19 Dec 2024 16:44:19 +0000
From: Kevin Brodsky <kevin.brodsky@....com>
To: linux-mm@...ck.org
Cc: Kevin Brodsky <kevin.brodsky@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	linux-alpha@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
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Subject: [PATCH 04/10] s390/mm: Add calls to pagetable_pud_[cd]tor

Commit 55d2a0bd5ead ("mm: add statistics for PUD level pagetable")
introduced PUD-level ctor/dtor helpers to improve the accounting of
page table pages. s390 doesn't use the generic pgalloc
implementation and it seems that it got missed in the process. Add
the missing calls to the ctor/dtor helpers in pud_alloc_one/pud_free
to match the other architectures.

Signed-off-by: Kevin Brodsky <kevin.brodsky@....com>
---
 arch/s390/include/asm/pgalloc.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
index 7b84ef6dc4b6..97db66ae06b9 100644
--- a/arch/s390/include/asm/pgalloc.h
+++ b/arch/s390/include/asm/pgalloc.h
@@ -67,15 +67,20 @@ static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	unsigned long *table = crst_table_alloc(mm);
-	if (table)
-		crst_table_init(table, _REGION3_ENTRY_EMPTY);
+
+	if (!table)
+		return NULL;
+	crst_table_init(table, _REGION3_ENTRY_EMPTY);
+	pagetable_pud_ctor(virt_to_ptdesc(table));
 	return (pud_t *) table;
 }
 
 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 {
-	if (!mm_pud_folded(mm))
-		crst_table_free(mm, (unsigned long *) pud);
+	if (mm_pud_folded(mm))
+		return;
+	pagetable_pud_dtor(virt_to_ptdesc(pud));
+	crst_table_free(mm, (unsigned long *) pud);
 }
 
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
-- 
2.47.0