[PATCH v5 1/3] arm64: mmu: introduce pgtable_alloc_t

Yeoreum Yun
2026-01-05T20:23:36Z

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@arm.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.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}