As part of the conversions to replace pgtable constructor/destructors with
ptdesc equivalents, convert various page table functions to use ptdescs.

Some of the functions use the *get*page*() helper functions. Convert
these to use pagetable_alloc() and ptdesc_address() instead to help
standardize page tables further.

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
---
 arch/m68k/include/asm/mcf_pgalloc.h  | 41 ++++++++++++++--------------
 arch/m68k/include/asm/sun3_pgalloc.h |  8 +++---
 arch/m68k/mm/motorola.c              |  4 +--
 3 files changed, 27 insertions(+), 26 deletions(-)

diff --git a/arch/m68k/include/asm/mcf_pgalloc.h b/arch/m68k/include/asm/mcf_pgalloc.h
index 5c2c0a864524..9eb4ef9e6d77 100644
--- a/arch/m68k/include/asm/mcf_pgalloc.h
+++ b/arch/m68k/include/asm/mcf_pgalloc.h
@@ -7,20 +7,19 @@
 
 extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 {
-	free_page((unsigned long) pte);
+	pagetable_free(virt_to_ptdesc(pte));
 }
 
 extern const char bad_pmd_string[];
 
 extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
 {
-	unsigned long page = __get_free_page(GFP_DMA);
+	struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0);
 
-	if (!page)
+	if (!ptdesc)
 		return NULL;
 
-	memset((void *)page, 0, PAGE_SIZE);
-	return (pte_t *) (page);
+	return (pte_t *) (ptdesc_address(ptdesc));
 }
 
 extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
@@ -35,36 +34,36 @@ extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
 				  unsigned long address)
 {
-	struct page *page = virt_to_page(pgtable);
+	struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
 
-	pgtable_pte_page_dtor(page);
-	__free_page(page);
+	pagetable_pte_dtor(ptdesc);
+	pagetable_free(ptdesc);
 }
 
 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
 {
-	struct page *page = alloc_pages(GFP_DMA, 0);
+	struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA, 0);
 	pte_t *pte;
 
-	if (!page)
+	if (!ptdesc)
 		return NULL;
-	if (!pgtable_pte_page_ctor(page)) {
-		__free_page(page);
+	if (!pagetable_pte_ctor(ptdesc)) {
+		pagetable_free(ptdesc);
 		return NULL;
 	}
 
-	pte = page_address(page);
-	clear_page(pte);
+	pte = ptdesc_address(ptdesc);
+	pagetable_clear(pte);
 
 	return pte;
 }
 
 static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
 {
-	struct page *page = virt_to_page(pgtable);
+	struct ptdesc *ptdesc = virt_to_ptdesc(ptdesc);
 
-	pgtable_pte_page_dtor(page);
-	__free_page(page);
+	pagetable_pte_dtor(ptdesc);
+	pagetable_free(ptdesc);
 }
 
 /*
@@ -75,16 +74,18 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
 
 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 {
-	free_page((unsigned long) pgd);
+	pagetable_free(virt_to_ptdesc(pgd));
 }
 
 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
 	pgd_t *new_pgd;
+	struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | GFP_NOWARN, 0);
 
-	new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
-	if (!new_pgd)
+	if (!ptdesc)
 		return NULL;
+	new_pgd = (pgd_t *) ptdesc_address(ptdesc);
+
 	memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
 	memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
 	return new_pgd;
diff --git a/arch/m68k/include/asm/sun3_pgalloc.h b/arch/m68k/include/asm/sun3_pgalloc.h
index 198036aff519..ff48573db2c0 100644
--- a/arch/m68k/include/asm/sun3_pgalloc.h
+++ b/arch/m68k/include/asm/sun3_pgalloc.h
@@ -17,10 +17,10 @@
 
 extern const char bad_pmd_string[];
 
-#define __pte_free_tlb(tlb,pte,addr)			\
-do {							\
-	pgtable_pte_page_dtor(pte);			\
-	tlb_remove_page((tlb), pte);			\
+#define __pte_free_tlb(tlb, pte, addr)				\
+do {								\
+	pagetable_pte_dtor(page_ptdesc(pte));			\
+	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));	\
 } while (0)
 
 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index c75984e2d86b..594575a0780c 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -161,7 +161,7 @@ void *get_pointer_table(int type)
 			 * m68k doesn't have SPLIT_PTE_PTLOCKS for not having
 			 * SMP.
 			 */
-			pgtable_pte_page_ctor(virt_to_page(page));
+			pagetable_pte_ctor(virt_to_ptdesc(page));
 		}
 
 		mmu_page_ctor(page);
@@ -201,7 +201,7 @@ int free_pointer_table(void *table, int type)
 		list_del(dp);
 		mmu_page_dtor((void *)page);
 		if (type == TABLE_PTE)
-			pgtable_pte_page_dtor(virt_to_page((void *)page));
+			pagetable_pte_dtor(virt_to_ptdesc((void *)page));
 		free_page (page);
 		return 1;
 	} else if (ptable_list[type].next != dp) {
-- 
2.40.1

Hi Vishal,

kernel test robot noticed the following build errors:

[auto build test ERROR on next-20230531]
[cannot apply to akpm-mm/mm-everything s390/features powerpc/next powerpc/fixes geert-m68k/for-next geert-m68k/for-linus linus/master v6.4-rc4 v6.4-rc3 v6.4-rc2 v6.4-rc4]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Vishal-Moola-Oracle/mm-Add-PAGE_TYPE_OP-folio-functions/20230601-053454
base:   next-20230531
patch link:    https://lore.kernel.org/r/20230531213032.25338-26-vishal.moola%40gmail.com
patch subject: [PATCH v3 25/34] m68k: Convert various functions to use ptdescs
config: m68k-randconfig-r002-20230531 (https://download.01.org/0day-ci/archive/20230601/202306011704.i8xMWKPl-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 12.3.0
reproduce (this is a W=1 build):
        mkdir -p ~/bin
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/915ab62dc3315fe0a0544fccb4ee5f3ee32694b5
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Vishal-Moola-Oracle/mm-Add-PAGE_TYPE_OP-folio-functions/20230601-053454
        git checkout 915ab62dc3315fe0a0544fccb4ee5f3ee32694b5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.3.0 ~/bin/make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.3.0 ~/bin/make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash arch/m68k/mm/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306011704.i8xMWKPl-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   In file included from arch/m68k/include/asm/pgalloc.h:12,
                    from arch/m68k/mm/init.c:26:
   arch/m68k/include/asm/mcf_pgalloc.h: In function 'pgd_alloc':
>> arch/m68k/include/asm/mcf_pgalloc.h:83:59: error: 'GFP_NOWARN' undeclared (first use in this function); did you mean 'GFP_NOWAIT'?
      83 |         struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | GFP_NOWARN, 0);
         |                                                           ^~~~~~~~~~
         |                                                           GFP_NOWAIT
   arch/m68k/include/asm/mcf_pgalloc.h:83:59: note: each undeclared identifier is reported only once for each function it appears in
   arch/m68k/include/asm/mcf_pgalloc.h: At top level:
>> arch/m68k/include/asm/mcf_pgalloc.h:22:27: warning: 'ptdesc_address' is static but used in inline function 'pte_alloc_one_kernel' which is not static
      22 |         return (pte_t *) (ptdesc_address(ptdesc));
         |                           ^~~~~~~~~~~~~~
>> arch/m68k/include/asm/mcf_pgalloc.h:17:33: warning: 'pagetable_alloc' is static but used in inline function 'pte_alloc_one_kernel' which is not static
      17 |         struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0);
         |                                 ^~~~~~~~~~~~~~~
>> arch/m68k/include/asm/mcf_pgalloc.h:10:24: warning: 'virt_to_ptdesc' is static but used in inline function 'pte_free_kernel' which is not static
      10 |         pagetable_free(virt_to_ptdesc(pte));
         |                        ^~~~~~~~~~~~~~
>> arch/m68k/include/asm/mcf_pgalloc.h:10:9: warning: 'pagetable_free' is static but used in inline function 'pte_free_kernel' which is not static
      10 |         pagetable_free(virt_to_ptdesc(pte));
         |         ^~~~~~~~~~~~~~
--
   In file included from arch/m68k/mm/mcfmmu.c:21:
   arch/m68k/include/asm/mcf_pgalloc.h: In function 'pgd_alloc':
>> arch/m68k/include/asm/mcf_pgalloc.h:83:59: error: 'GFP_NOWARN' undeclared (first use in this function); did you mean 'GFP_NOWAIT'?
      83 |         struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | GFP_NOWARN, 0);
         |                                                           ^~~~~~~~~~
         |                                                           GFP_NOWAIT
   arch/m68k/include/asm/mcf_pgalloc.h:83:59: note: each undeclared identifier is reported only once for each function it appears in
   arch/m68k/mm/mcfmmu.c: At top level:
   arch/m68k/mm/mcfmmu.c:36:13: warning: no previous prototype for 'paging_init' [-Wmissing-prototypes]
      36 | void __init paging_init(void)
         |             ^~~~~~~~~~~
   arch/m68k/mm/mcfmmu.c: In function 'paging_init':
   arch/m68k/mm/mcfmmu.c:41:37: warning: variable 'bootmem_end' set but not used [-Wunused-but-set-variable]
      41 |         unsigned long next_pgtable, bootmem_end;
         |                                     ^~~~~~~~~~~
   arch/m68k/include/asm/mcf_pgalloc.h: At top level:
>> arch/m68k/include/asm/mcf_pgalloc.h:22:27: warning: 'ptdesc_address' is static but used in inline function 'pte_alloc_one_kernel' which is not static
      22 |         return (pte_t *) (ptdesc_address(ptdesc));
         |                           ^~~~~~~~~~~~~~
>> arch/m68k/include/asm/mcf_pgalloc.h:17:33: warning: 'pagetable_alloc' is static but used in inline function 'pte_alloc_one_kernel' which is not static
      17 |         struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0);
         |                                 ^~~~~~~~~~~~~~~
>> arch/m68k/include/asm/mcf_pgalloc.h:10:24: warning: 'virt_to_ptdesc' is static but used in inline function 'pte_free_kernel' which is not static
      10 |         pagetable_free(virt_to_ptdesc(pte));
         |                        ^~~~~~~~~~~~~~
>> arch/m68k/include/asm/mcf_pgalloc.h:10:9: warning: 'pagetable_free' is static but used in inline function 'pte_free_kernel' which is not static
      10 |         pagetable_free(virt_to_ptdesc(pte));
         |         ^~~~~~~~~~~~~~


vim +83 arch/m68k/include/asm/mcf_pgalloc.h

     7	
     8	extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
     9	{
  > 10		pagetable_free(virt_to_ptdesc(pte));
    11	}
    12	
    13	extern const char bad_pmd_string[];
    14	
    15	extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
    16	{
  > 17		struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0);
    18	
    19		if (!ptdesc)
    20			return NULL;
    21	
  > 22		return (pte_t *) (ptdesc_address(ptdesc));
    23	}
    24	
    25	extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
    26	{
    27		return (pmd_t *) pgd;
    28	}
    29	
    30	#define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
    31	
    32	#define pmd_populate_kernel pmd_populate
    33	
    34	static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
    35					  unsigned long address)
    36	{
    37		struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
    38	
    39		pagetable_pte_dtor(ptdesc);
    40		pagetable_free(ptdesc);
    41	}
    42	
    43	static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
    44	{
    45		struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA, 0);
    46		pte_t *pte;
    47	
    48		if (!ptdesc)
    49			return NULL;
    50		if (!pagetable_pte_ctor(ptdesc)) {
    51			pagetable_free(ptdesc);
    52			return NULL;
    53		}
    54	
    55		pte = ptdesc_address(ptdesc);
    56		pagetable_clear(pte);
    57	
    58		return pte;
    59	}
    60	
    61	static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
    62	{
    63		struct ptdesc *ptdesc = virt_to_ptdesc(ptdesc);
    64	
    65		pagetable_pte_dtor(ptdesc);
    66		pagetable_free(ptdesc);
    67	}
    68	
    69	/*
    70	 * In our implementation, each pgd entry contains 1 pmd that is never allocated
    71	 * or freed.  pgd_present is always 1, so this should never be called. -NL
    72	 */
    73	#define pmd_free(mm, pmd) BUG()
    74	
    75	static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
    76	{
    77		pagetable_free(virt_to_ptdesc(pgd));
    78	}
    79	
    80	static inline pgd_t *pgd_alloc(struct mm_struct *mm)
    81	{
    82		pgd_t *new_pgd;
  > 83		struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | GFP_NOWARN, 0);
    84	
    85		if (!ptdesc)
    86			return NULL;
    87		new_pgd = (pgd_t *) ptdesc_address(ptdesc);
    88	
    89		memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
    90		memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
    91		return new_pgd;
    92	}
    93	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Hi Vishal,

On Wed, May 31, 2023 at 11:32 PM Vishal Moola (Oracle)
<vishal.moola@gmail.com> wrote:
> As part of the conversions to replace pgtable constructor/destructors with
> ptdesc equivalents, convert various page table functions to use ptdescs.
>
> Some of the functions use the *get*page*() helper functions. Convert
> these to use pagetable_alloc() and ptdesc_address() instead to help
> standardize page tables further.
>
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>

Thanks for your patch!

> --- a/arch/m68k/include/asm/mcf_pgalloc.h
> +++ b/arch/m68k/include/asm/mcf_pgalloc.h
> @@ -7,20 +7,19 @@
>
>  extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
>  {
> -       free_page((unsigned long) pte);
> +       pagetable_free(virt_to_ptdesc(pte));
>  }
>
>  extern const char bad_pmd_string[];
>
>  extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
>  {
> -       unsigned long page = __get_free_page(GFP_DMA);
> +       struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0);
>
> -       if (!page)
> +       if (!ptdesc)
>                 return NULL;
>
> -       memset((void *)page, 0, PAGE_SIZE);
> -       return (pte_t *) (page);
> +       return (pte_t *) (ptdesc_address(ptdesc));

No need to cast "void *" when returning a different pointer type.

>  }
>
>  extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
> @@ -35,36 +34,36 @@ extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
>  static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
>                                   unsigned long address)
>  {
> -       struct page *page = virt_to_page(pgtable);
> +       struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
>
> -       pgtable_pte_page_dtor(page);
> -       __free_page(page);
> +       pagetable_pte_dtor(ptdesc);
> +       pagetable_free(ptdesc);
>  }
>
>  static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
>  {
> -       struct page *page = alloc_pages(GFP_DMA, 0);
> +       struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA, 0);
>         pte_t *pte;
>
> -       if (!page)
> +       if (!ptdesc)
>                 return NULL;
> -       if (!pgtable_pte_page_ctor(page)) {
> -               __free_page(page);
> +       if (!pagetable_pte_ctor(ptdesc)) {
> +               pagetable_free(ptdesc);
>                 return NULL;
>         }
>
> -       pte = page_address(page);
> -       clear_page(pte);
> +       pte = ptdesc_address(ptdesc);
> +       pagetable_clear(pte);
>
>         return pte;
>  }
>
>  static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
>  {
> -       struct page *page = virt_to_page(pgtable);
> +       struct ptdesc *ptdesc = virt_to_ptdesc(ptdesc);

virt_to_ptdesc(pgtable)

(You can build this using m5475evb_defconfig)

>
> -       pgtable_pte_page_dtor(page);
> -       __free_page(page);
> +       pagetable_pte_dtor(ptdesc);
> +       pagetable_free(ptdesc);
>  }
>
>  /*
> @@ -75,16 +74,18 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
>
>  static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
>  {
> -       free_page((unsigned long) pgd);
> +       pagetable_free(virt_to_ptdesc(pgd));
>  }
>
>  static inline pgd_t *pgd_alloc(struct mm_struct *mm)
>  {
>         pgd_t *new_pgd;
> +       struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | GFP_NOWARN, 0);
>
> -       new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
> -       if (!new_pgd)
> +       if (!ptdesc)
>                 return NULL;
> +       new_pgd = (pgd_t *) ptdesc_address(ptdesc);

No need to cast "void *" when assigning to a different pointer type.

> +
>         memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
>         memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
>         return new_pgd;

The rest LGTM.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

On Thu, Jun 1, 2023 at 12:40 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Vishal,
>
> On Wed, May 31, 2023 at 11:32 PM Vishal Moola (Oracle)
> <vishal.moola@gmail.com> wrote:
> > As part of the conversions to replace pgtable constructor/destructors with
> > ptdesc equivalents, convert various page table functions to use ptdescs.
> >
> > Some of the functions use the *get*page*() helper functions. Convert
> > these to use pagetable_alloc() and ptdesc_address() instead to help
> > standardize page tables further.
> >
> > Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
>
> Thanks for your patch!
>
> > --- a/arch/m68k/include/asm/mcf_pgalloc.h
> > +++ b/arch/m68k/include/asm/mcf_pgalloc.h
> > @@ -7,20 +7,19 @@
> >
> >  extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
> >  {
> > -       free_page((unsigned long) pte);
> > +       pagetable_free(virt_to_ptdesc(pte));
> >  }
> >
> >  extern const char bad_pmd_string[];
> >
> >  extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
> >  {
> > -       unsigned long page = __get_free_page(GFP_DMA);
> > +       struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | __GFP_ZERO, 0);
> >
> > -       if (!page)
> > +       if (!ptdesc)
> >                 return NULL;
> >
> > -       memset((void *)page, 0, PAGE_SIZE);
> > -       return (pte_t *) (page);
> > +       return (pte_t *) (ptdesc_address(ptdesc));
>
> No need to cast "void *" when returning a different pointer type.
>
> >  }
> >
> >  extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
> > @@ -35,36 +34,36 @@ extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
> >  static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
> >                                   unsigned long address)
> >  {
> > -       struct page *page = virt_to_page(pgtable);
> > +       struct ptdesc *ptdesc = virt_to_ptdesc(pgtable);
> >
> > -       pgtable_pte_page_dtor(page);
> > -       __free_page(page);
> > +       pagetable_pte_dtor(ptdesc);
> > +       pagetable_free(ptdesc);
> >  }
> >
> >  static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
> >  {
> > -       struct page *page = alloc_pages(GFP_DMA, 0);
> > +       struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA, 0);
> >         pte_t *pte;
> >
> > -       if (!page)
> > +       if (!ptdesc)
> >                 return NULL;
> > -       if (!pgtable_pte_page_ctor(page)) {
> > -               __free_page(page);
> > +       if (!pagetable_pte_ctor(ptdesc)) {
> > +               pagetable_free(ptdesc);
> >                 return NULL;
> >         }
> >
> > -       pte = page_address(page);
> > -       clear_page(pte);
> > +       pte = ptdesc_address(ptdesc);
> > +       pagetable_clear(pte);
> >
> >         return pte;
> >  }
> >
> >  static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
> >  {
> > -       struct page *page = virt_to_page(pgtable);
> > +       struct ptdesc *ptdesc = virt_to_ptdesc(ptdesc);
>
> virt_to_ptdesc(pgtable)
>
> (You can build this using m5475evb_defconfig)
>
> >
> > -       pgtable_pte_page_dtor(page);
> > -       __free_page(page);
> > +       pagetable_pte_dtor(ptdesc);
> > +       pagetable_free(ptdesc);
> >  }
> >
> >  /*
> > @@ -75,16 +74,18 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
> >
> >  static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
> >  {
> > -       free_page((unsigned long) pgd);
> > +       pagetable_free(virt_to_ptdesc(pgd));
> >  }
> >
> >  static inline pgd_t *pgd_alloc(struct mm_struct *mm)
> >  {
> >         pgd_t *new_pgd;
> > +       struct ptdesc *ptdesc = pagetable_alloc(GFP_DMA | GFP_NOWARN, 0);
> >
> > -       new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
> > -       if (!new_pgd)
> > +       if (!ptdesc)
> >                 return NULL;
> > +       new_pgd = (pgd_t *) ptdesc_address(ptdesc);
>
> No need to cast "void *" when assigning to a different pointer type.
>
> > +
> >         memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
> >         memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
> >         return new_pgd;
>
> The rest LGTM.

Thanks so much for the review! I'll make those changes in the next
version.


> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds