1. Patchew
  2. linux
  3. [PATCH v4 0/3] fix wrong usage of memory allocation APIs under PREEMPT_RT in arm64
  4. View patch

[PATCH v4 1/3] arm64: mmu: introduce pgtable_alloc_t

Yeoreum Yun posted 3 patches 1 month, 1 week ago
There is a newer version of this series
[PATCH v4 1/3] arm64: mmu: introduce pgtable_alloc_t
Posted by Yeoreum Yun 1 month, 1 week ago 
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>
---
 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}
Re: [PATCH v4 1/3] arm64: mmu: introduce pgtable_alloc_t
Posted by Ryan Roberts 1 month, 1 week ago 
On 02/01/2026 15:07, Yeoreum Yun wrote:
> 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;
Re: [PATCH v4 1/3] arm64: mmu: introduce pgtable_alloc_t
Posted by Yeoreum Yun 1 month, 1 week ago 
> On 02/01/2026 15:07, Yeoreum Yun wrote:
> > 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>

Thanks ;)


>
> > ---
> >  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;
>

--
Sincerely,
Yeoreum Yun

Patchew 2.1-devel-b67e4c2

© 2016 - 2026 Red Hat, Inc.