linux-kernel - [PATCH v4 1/3] arm64: mmu: introduce pgtable_alloc

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Message-Id: <20260102150736.1378818-2-yeoreum.yun@arm.com>
Date: Fri,  2 Jan 2026 15:07:34 +0000
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
	will@...nel.org,
	ryan.roberts@....com,
	akpm@...ux-foundation.org,
	david@...nel.org,
	kevin.brodsky@....com,
	quic_zhenhuah@...cinc.com,
	dev.jain@....com,
	yang@...amperecomputing.com,
	chaitanyas.prakash@....com,
	bigeasy@...utronix.de,
	clrkwllms@...nel.org,
	rostedt@...dmis.org,
	lorenzo.stoakes@...cle.com,
	ardb@...nel.org,
	jackmanb@...gle.com,
	vbabka@...e.cz,
	mhocko@...e.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v4 1/3] arm64: mmu: introduce pgtable_alloc_t

This is preparation patch to use preallocated page tables
for linear_map_split_to_ptes().

Define pgtable_alloc_t type for callback used by create_XXX_mapping().

Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
---
 arch/arm64/mm/mmu.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 8e1d80a7033e..4b4908ae189b 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -74,6 +74,8 @@ EXPORT_SYMBOL(empty_zero_page);
 static DEFINE_SPINLOCK(swapper_pgdir_lock);
 static DEFINE_MUTEX(fixmap_lock);
 
+typedef phys_addr_t (pgtable_alloc_t)(enum pgtable_type);
+
 void noinstr set_swapper_pgd(pgd_t *pgdp, pgd_t pgd)
 {
 	pgd_t *fixmap_pgdp;
@@ -197,7 +199,7 @@ static void init_pte(pte_t *ptep, unsigned long addr, unsigned long end,
 static int alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
 			       unsigned long end, phys_addr_t phys,
 			       pgprot_t prot,
-			       phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+			       pgtable_alloc_t pgtable_alloc,
 			       int flags)
 {
 	unsigned long next;
@@ -252,7 +254,7 @@ static int alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
 
 static int init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
 		    phys_addr_t phys, pgprot_t prot,
-		    phys_addr_t (*pgtable_alloc)(enum pgtable_type), int flags)
+		    pgtable_alloc_t pgtable_alloc, int flags)
 {
 	unsigned long next;
 
@@ -292,7 +294,7 @@ static int init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
 static int alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
 			       unsigned long end, phys_addr_t phys,
 			       pgprot_t prot,
-			       phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+			       pgtable_alloc_t pgtable_alloc,
 			       int flags)
 {
 	int ret;
@@ -349,7 +351,7 @@ static int alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
 
 static int alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
 			  phys_addr_t phys, pgprot_t prot,
-			  phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+			  pgtable_alloc_t pgtable_alloc,
 			  int flags)
 {
 	int ret = 0;
@@ -415,7 +417,7 @@ static int alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
 
 static int alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
 			  phys_addr_t phys, pgprot_t prot,
-			  phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+			  pgtable_alloc_t pgtable_alloc,
 			  int flags)
 {
 	int ret;
@@ -467,7 +469,7 @@ static int alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
 static int __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
 				       unsigned long virt, phys_addr_t size,
 				       pgprot_t prot,
-				       phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+				       pgtable_alloc_t pgtable_alloc,
 				       int flags)
 {
 	int ret;
@@ -500,7 +502,7 @@ static int __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
 static int __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
 				unsigned long virt, phys_addr_t size,
 				pgprot_t prot,
-				phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+				pgtable_alloc_t pgtable_alloc,
 				int flags)
 {
 	int ret;
@@ -516,7 +518,7 @@ static int __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
 static void early_create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
 				     unsigned long virt, phys_addr_t size,
 				     pgprot_t prot,
-				     phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+				     pgtable_alloc_t pgtable_alloc,
 				     int flags)
 {
 	int ret;
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}