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Message-ID: <7ae6ea77-635f-1d9e-8145-9da7c6027380@linux-m68k.org>
Date: Thu, 24 Oct 2019 14:12:05 +1000
From: Greg Ungerer <gerg@...ux-m68k.org>
To: Mike Rapoport <rppt@...nel.org>, linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
Arnd Bergmann <arnd@...db.de>,
"David S. Miller" <davem@...emloft.net>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Greentime Hu <green.hu@...il.com>,
Helge Deller <deller@....de>,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
Jeff Dike <jdike@...toit.com>,
"Kirill A. Shutemov" <kirill@...temov.name>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Mark Salter <msalter@...hat.com>,
Matt Turner <mattst88@...il.com>,
Michal Simek <monstr@...str.eu>,
Richard Weinberger <richard@....at>,
Russell King <linux@...linux.org.uk>,
Sam Creasey <sammy@...my.net>,
Vincent Chen <deanbo422@...il.com>,
Vineet Gupta <Vineet.Gupta1@...opsys.com>,
linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
linux-parisc@...r.kernel.org, linux-um@...ts.infradead.org,
sparclinux@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH 05/12] m68k: mm: use pgtable-nopXd instead of 4level-fixup
Hi Mike,
On 23/10/19 7:28 pm, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
>
> m68k has two or three levels of page tables and can use appropriate
> pgtable-nopXd and folding of the upper layers.
>
> Replace usage of include/asm-generic/4level-fixup.h and explicit
> definitions of __PAGETABLE_PxD_FOLDED in m68k with
> include/asm-generic/pgtable-nopmd.h for two-level configurations and with
> include/asm-generic/pgtable-nopmd.h for three-lelve configurations and
> adjust page table manipulation macros and functions accordingly.
>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
Tested (on real hardware) for the ColdFire MMU m68k variants and working
Acked-by: Greg Ungerer <gerg@...ux-m68k.org>
Regards
Greg
> ---
> arch/m68k/include/asm/mcf_pgalloc.h | 7 -------
> arch/m68k/include/asm/mcf_pgtable.h | 28 +++++++++----------------
> arch/m68k/include/asm/mmu_context.h | 12 ++++++++++-
> arch/m68k/include/asm/motorola_pgalloc.h | 4 ++--
> arch/m68k/include/asm/motorola_pgtable.h | 32 +++++++++++++++++-----------
> arch/m68k/include/asm/page.h | 9 +++++---
> arch/m68k/include/asm/pgtable_mm.h | 11 ++++++----
> arch/m68k/include/asm/sun3_pgalloc.h | 5 -----
> arch/m68k/include/asm/sun3_pgtable.h | 18 ----------------
> arch/m68k/kernel/sys_m68k.c | 10 ++++++++-
> arch/m68k/mm/init.c | 6 ++++--
> arch/m68k/mm/kmap.c | 36 ++++++++++++++++++++++++--------
> arch/m68k/mm/mcfmmu.c | 16 +++++++++++++-
> arch/m68k/mm/motorola.c | 17 +++++++++------
> 14 files changed, 122 insertions(+), 89 deletions(-)
>
> diff --git a/arch/m68k/include/asm/mcf_pgalloc.h b/arch/m68k/include/asm/mcf_pgalloc.h
> index b34d44d..82ec54c 100644
> --- a/arch/m68k/include/asm/mcf_pgalloc.h
> +++ b/arch/m68k/include/asm/mcf_pgalloc.h
> @@ -28,9 +28,6 @@ extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
> return (pmd_t *) pgd;
> }
>
> -#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
> -#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
> -
> #define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
> (unsigned long)(page_address(page)))
>
> @@ -45,8 +42,6 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
> __free_page(page);
> }
>
> -#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
> -
> static inline struct page *pte_alloc_one(struct mm_struct *mm)
> {
> struct page *page = alloc_pages(GFP_DMA, 0);
> @@ -100,6 +95,4 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
> return new_pgd;
> }
>
> -#define pgd_populate(mm, pmd, pte) BUG()
> -
> #endif /* M68K_MCF_PGALLOC_H */
> diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
> index 5d5502c..b9f45ae 100644
> --- a/arch/m68k/include/asm/mcf_pgtable.h
> +++ b/arch/m68k/include/asm/mcf_pgtable.h
> @@ -198,17 +198,9 @@ static inline int pmd_bad2(pmd_t *pmd) { return 0; }
> #define pmd_present(pmd) (!pmd_none2(&(pmd)))
> static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
>
> -static inline int pgd_none(pgd_t pgd) { return 0; }
> -static inline int pgd_bad(pgd_t pgd) { return 0; }
> -static inline int pgd_present(pgd_t pgd) { return 1; }
> -static inline void pgd_clear(pgd_t *pgdp) {}
> -
> #define pte_ERROR(e) \
> printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
> __FILE__, __LINE__, pte_val(e))
> -#define pmd_ERROR(e) \
> - printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \
> - __FILE__, __LINE__, pmd_val(e))
> #define pgd_ERROR(e) \
> printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
> __FILE__, __LINE__, pgd_val(e))
> @@ -340,14 +332,6 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
> #define pgd_offset_k(address) pgd_offset(&init_mm, address)
>
> /*
> - * Find an entry in the second-level pagetable.
> - */
> -static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
> -{
> - return (pmd_t *) pgd;
> -}
> -
> -/*
> * Find an entry in the third-level pagetable.
> */
> #define __pte_offset(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
> @@ -360,12 +344,16 @@ static inline pmd_t *pmd_offset(pgd_t *pgd, unsigned long address)
> static inline void nocache_page(void *vaddr)
> {
> pgd_t *dir;
> + p4d_t *p4dp;
> + pud_t *pudp;
> pmd_t *pmdp;
> pte_t *ptep;
> unsigned long addr = (unsigned long) vaddr;
>
> dir = pgd_offset_k(addr);
> - pmdp = pmd_offset(dir, addr);
> + p4dp = p4d_offset(dir, addr);
> + pudp = pud_offset(p4dp, addr);
> + pmdp = pmd_offset(pudp, addr);
> ptep = pte_offset_kernel(pmdp, addr);
> *ptep = pte_mknocache(*ptep);
> }
> @@ -376,12 +364,16 @@ static inline void nocache_page(void *vaddr)
> static inline void cache_page(void *vaddr)
> {
> pgd_t *dir;
> + p4d_t *p4dp;
> + pud_t *pudp;
> pmd_t *pmdp;
> pte_t *ptep;
> unsigned long addr = (unsigned long) vaddr;
>
> dir = pgd_offset_k(addr);
> - pmdp = pmd_offset(dir, addr);
> + p4dp = p4d_offset(dir, addr);
> + pudp = pud_offset(p4dp, addr);
> + pmdp = pmd_offset(pudp, addr);
> ptep = pte_offset_kernel(pmdp, addr);
> *ptep = pte_mkcache(*ptep);
> }
> diff --git a/arch/m68k/include/asm/mmu_context.h b/arch/m68k/include/asm/mmu_context.h
> index f5b1852..cac9f28 100644
> --- a/arch/m68k/include/asm/mmu_context.h
> +++ b/arch/m68k/include/asm/mmu_context.h
> @@ -100,6 +100,8 @@ static inline void load_ksp_mmu(struct task_struct *task)
> struct mm_struct *mm;
> int asid;
> pgd_t *pgd;
> + p4d_t *p4d;
> + pud_t *pud;
> pmd_t *pmd;
> pte_t *pte;
> unsigned long mmuar;
> @@ -127,7 +129,15 @@ static inline void load_ksp_mmu(struct task_struct *task)
> if (pgd_none(*pgd))
> goto bug;
>
> - pmd = pmd_offset(pgd, mmuar);
> + p4d = p4d_offset(pgd, mmuar);
> + if (p4d_none(*p4d))
> + goto bug;
> +
> + pud = pud_offset(p4d, mmuar);
> + if (pud_none(*pud))
> + goto bug;
> +
> + pmd = pmd_offset(pud, mmuar);
> if (pmd_none(*pmd))
> goto bug;
>
> diff --git a/arch/m68k/include/asm/motorola_pgalloc.h b/arch/m68k/include/asm/motorola_pgalloc.h
> index acab315..ff9cc40 100644
> --- a/arch/m68k/include/asm/motorola_pgalloc.h
> +++ b/arch/m68k/include/asm/motorola_pgalloc.h
> @@ -106,9 +106,9 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page
> }
> #define pmd_pgtable(pmd) pmd_page(pmd)
>
> -static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
> +static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
> {
> - pgd_set(pgd, pmd);
> + pud_set(pud, pmd);
> }
>
> #endif /* _MOTOROLA_PGALLOC_H */
> diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h
> index 7f66a7b..62bedc6 100644
> --- a/arch/m68k/include/asm/motorola_pgtable.h
> +++ b/arch/m68k/include/asm/motorola_pgtable.h
> @@ -117,14 +117,14 @@ static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
> }
> }
>
> -static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
> +static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
> {
> - pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
> + pud_val(*pudp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
> }
>
> #define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
> #define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
> -#define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
> +#define pud_page_vaddr(pud) ((unsigned long)__va(pud_val(pud) & _TABLE_MASK))
>
>
> #define pte_none(pte) (!pte_val(pte))
> @@ -147,11 +147,11 @@ static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
> #define pmd_page(pmd) virt_to_page(__va(pmd_val(pmd)))
>
>
> -#define pgd_none(pgd) (!pgd_val(pgd))
> -#define pgd_bad(pgd) ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
> -#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_TABLE)
> -#define pgd_clear(pgdp) ({ pgd_val(*pgdp) = 0; })
> -#define pgd_page(pgd) (mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
> +#define pud_none(pud) (!pud_val(pud))
> +#define pud_bad(pud) ((pud_val(pud) & _DESCTYPE_MASK) != _PAGE_TABLE)
> +#define pud_present(pud) (pud_val(pud) & _PAGE_TABLE)
> +#define pud_clear(pudp) ({ pud_val(*pudp) = 0; })
> +#define pud_page(pud) (mem_map + ((unsigned long)(__va(pud_val(pud)) - PAGE_OFFSET) >> PAGE_SHIFT))
>
> #define pte_ERROR(e) \
> printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
> @@ -209,9 +209,9 @@ static inline pgd_t *pgd_offset_k(unsigned long address)
>
>
> /* Find an entry in the second-level page table.. */
> -static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
> +static inline pmd_t *pmd_offset(pud_t *dir, unsigned long address)
> {
> - return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
> + return (pmd_t *)pud_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
> }
>
> /* Find an entry in the third-level page table.. */
> @@ -239,11 +239,15 @@ static inline void nocache_page(void *vaddr)
>
> if (CPU_IS_040_OR_060) {
> pgd_t *dir;
> + p4d_t *p4dp;
> + pud_t *pudp;
> pmd_t *pmdp;
> pte_t *ptep;
>
> dir = pgd_offset_k(addr);
> - pmdp = pmd_offset(dir, addr);
> + p4dp = p4d_offset(dir, addr);
> + pudp = pud_offset(p4dp, addr);
> + pmdp = pmd_offset(pudp, addr);
> ptep = pte_offset_kernel(pmdp, addr);
> *ptep = pte_mknocache(*ptep);
> }
> @@ -255,11 +259,15 @@ static inline void cache_page(void *vaddr)
>
> if (CPU_IS_040_OR_060) {
> pgd_t *dir;
> + p4d_t *p4dp;
> + pud_t *pudp;
> pmd_t *pmdp;
> pte_t *ptep;
>
> dir = pgd_offset_k(addr);
> - pmdp = pmd_offset(dir, addr);
> + p4dp = p4d_offset(dir, addr);
> + pudp = pud_offset(p4dp, addr);
> + pmdp = pmd_offset(pudp, addr);
> ptep = pte_offset_kernel(pmdp, addr);
> *ptep = pte_mkcache(*ptep);
> }
> diff --git a/arch/m68k/include/asm/page.h b/arch/m68k/include/asm/page.h
> index 700d819..c00b67a 100644
> --- a/arch/m68k/include/asm/page.h
> +++ b/arch/m68k/include/asm/page.h
> @@ -21,19 +21,22 @@
> /*
> * These are used to make use of C type-checking..
> */
> -typedef struct { unsigned long pte; } pte_t;
> +#if CONFIG_PGTABLE_LEVELS == 3
> typedef struct { unsigned long pmd[16]; } pmd_t;
> +#define pmd_val(x) ((&x)->pmd[0])
> +#define __pmd(x) ((pmd_t) { { (x) }, })
> +#endif
> +
> +typedef struct { unsigned long pte; } pte_t;
> typedef struct { unsigned long pgd; } pgd_t;
> typedef struct { unsigned long pgprot; } pgprot_t;
> typedef struct page *pgtable_t;
>
> #define pte_val(x) ((x).pte)
> -#define pmd_val(x) ((&x)->pmd[0])
> #define pgd_val(x) ((x).pgd)
> #define pgprot_val(x) ((x).pgprot)
>
> #define __pte(x) ((pte_t) { (x) } )
> -#define __pmd(x) ((pmd_t) { { (x) }, })
> #define __pgd(x) ((pgd_t) { (x) } )
> #define __pgprot(x) ((pgprot_t) { (x) } )
>
> diff --git a/arch/m68k/include/asm/pgtable_mm.h b/arch/m68k/include/asm/pgtable_mm.h
> index 646c174f..2bf5c35 100644
> --- a/arch/m68k/include/asm/pgtable_mm.h
> +++ b/arch/m68k/include/asm/pgtable_mm.h
> @@ -2,7 +2,12 @@
> #ifndef _M68K_PGTABLE_H
> #define _M68K_PGTABLE_H
>
> -#include <asm-generic/4level-fixup.h>
> +
> +#if defined(CONFIG_SUN3) || defined(CONFIG_COLDFIRE)
> +#include <asm-generic/pgtable-nopmd.h>
> +#else
> +#include <asm-generic/pgtable-nopud.h>
> +#endif
>
> #include <asm/setup.h>
>
> @@ -30,9 +35,7 @@
>
>
> /* PMD_SHIFT determines the size of the area a second-level page table can map */
> -#ifdef CONFIG_SUN3
> -#define PMD_SHIFT 17
> -#else
> +#if CONFIG_PGTABLE_LEVELS == 3
> #define PMD_SHIFT 22
> #endif
> #define PMD_SIZE (1UL << PMD_SHIFT)
> diff --git a/arch/m68k/include/asm/sun3_pgalloc.h b/arch/m68k/include/asm/sun3_pgalloc.h
> index 8561211..11b95da 100644
> --- a/arch/m68k/include/asm/sun3_pgalloc.h
> +++ b/arch/m68k/include/asm/sun3_pgalloc.h
> @@ -17,8 +17,6 @@
>
> extern const char bad_pmd_string[];
>
> -#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
> -
> #define __pte_free_tlb(tlb,pte,addr) \
> do { \
> pgtable_pte_page_dtor(pte); \
> @@ -41,7 +39,6 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page
> * inside the pgd, so has no extra memory associated with it.
> */
> #define pmd_free(mm, x) do { } while (0)
> -#define __pmd_free_tlb(tlb, x, addr) do { } while (0)
>
> static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
> {
> @@ -58,6 +55,4 @@ static inline pgd_t * pgd_alloc(struct mm_struct *mm)
> return new_pgd;
> }
>
> -#define pgd_populate(mm, pmd, pte) BUG()
> -
> #endif /* SUN3_PGALLOC_H */
> diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
> index c987d50..bc41552 100644
> --- a/arch/m68k/include/asm/sun3_pgtable.h
> +++ b/arch/m68k/include/asm/sun3_pgtable.h
> @@ -110,11 +110,6 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
>
> #define pmd_set(pmdp,ptep) do {} while (0)
>
> -static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
> -{
> - pgd_val(*pgdp) = virt_to_phys(pmdp);
> -}
> -
> #define __pte_page(pte) \
> ((unsigned long) __va ((pte_val (pte) & SUN3_PAGE_PGNUM_MASK) << PAGE_SHIFT))
> #define __pmd_page(pmd) \
> @@ -145,16 +140,9 @@ static inline int pmd_present2 (pmd_t *pmd) { return pmd_val (*pmd) & SUN3_PMD_V
> #define pmd_present(pmd) (!pmd_none2(&(pmd)))
> static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
>
> -static inline int pgd_none (pgd_t pgd) { return 0; }
> -static inline int pgd_bad (pgd_t pgd) { return 0; }
> -static inline int pgd_present (pgd_t pgd) { return 1; }
> -static inline void pgd_clear (pgd_t *pgdp) {}
> -
>
> #define pte_ERROR(e) \
> pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
> -#define pmd_ERROR(e) \
> - pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
> #define pgd_ERROR(e) \
> pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
>
> @@ -194,12 +182,6 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
> /* Find an entry in a kernel pagetable directory. */
> #define pgd_offset_k(address) pgd_offset(&init_mm, address)
>
> -/* Find an entry in the second-level pagetable. */
> -static inline pmd_t *pmd_offset (pgd_t *pgd, unsigned long address)
> -{
> - return (pmd_t *) pgd;
> -}
> -
> /* Find an entry in the third-level pagetable. */
> #define pte_index(address) ((address >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
> #define pte_offset_kernel(pmd, address) ((pte_t *) __pmd_page(*pmd) + pte_index(address))
> diff --git a/arch/m68k/kernel/sys_m68k.c b/arch/m68k/kernel/sys_m68k.c
> index 6363ec8..18a4de7 100644
> --- a/arch/m68k/kernel/sys_m68k.c
> +++ b/arch/m68k/kernel/sys_m68k.c
> @@ -465,6 +465,8 @@ sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
> for (;;) {
> struct mm_struct *mm = current->mm;
> pgd_t *pgd;
> + p4d_t *p4d;
> + pud_t *pud;
> pmd_t *pmd;
> pte_t *pte;
> spinlock_t *ptl;
> @@ -474,7 +476,13 @@ sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
> pgd = pgd_offset(mm, (unsigned long)mem);
> if (!pgd_present(*pgd))
> goto bad_access;
> - pmd = pmd_offset(pgd, (unsigned long)mem);
> + p4d = p4d_offset(pgd, (unsigned long)mem);
> + if (!p4d_present(*p4d))
> + goto bad_access;
> + pud = pud_offset(p4d, (unsigned long)mem);
> + if (!pud_present(*pud))
> + goto bad_access;
> + pmd = pmd_offset(pud, (unsigned long)mem);
> if (!pmd_present(*pmd))
> goto bad_access;
> pte = pte_offset_map_lock(mm, pmd, (unsigned long)mem, &ptl);
> diff --git a/arch/m68k/mm/init.c b/arch/m68k/mm/init.c
> index 778cacb..27c453f 100644
> --- a/arch/m68k/mm/init.c
> +++ b/arch/m68k/mm/init.c
> @@ -130,8 +130,10 @@ static inline void init_pointer_tables(void)
> /* insert pointer tables allocated so far into the tablelist */
> init_pointer_table((unsigned long)kernel_pg_dir);
> for (i = 0; i < PTRS_PER_PGD; i++) {
> - if (pgd_present(kernel_pg_dir[i]))
> - init_pointer_table(__pgd_page(kernel_pg_dir[i]));
> + pud_t *pud = (pud_t *)(&kernel_pg_dir[i]);
> +
> + if (pud_present(*pud))
> + init_pointer_table(pgd_page_vaddr(kernel_pg_dir[i]));
> }
>
> /* insert also pointer table that we used to unmap the zero page */
> diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
> index 40a3b32..9f687da 100644
> --- a/arch/m68k/mm/kmap.c
> +++ b/arch/m68k/mm/kmap.c
> @@ -110,6 +110,8 @@ void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cachefla
> unsigned long virtaddr, retaddr;
> long offset;
> pgd_t *pgd_dir;
> + p4d_t *p4d_dir;
> + pud_t *pud_dir;
> pmd_t *pmd_dir;
> pte_t *pte_dir;
>
> @@ -196,17 +198,21 @@ void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cachefla
> printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
> #endif
> pgd_dir = pgd_offset_k(virtaddr);
> - pmd_dir = pmd_alloc(&init_mm, pgd_dir, virtaddr);
> + p4d_dir = p4d_offset(pgd_dir, virtaddr);
> + pud_dir = pud_offset(p4d_dir, virtaddr);
> + pmd_dir = pmd_alloc(&init_mm, pud_dir, virtaddr);
> if (!pmd_dir) {
> printk("ioremap: no mem for pmd_dir\n");
> return NULL;
> }
>
> if (CPU_IS_020_OR_030) {
> +#if CONFIG_PGTABLE_LEVELS == 3
> pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
> physaddr += PTRTREESIZE;
> virtaddr += PTRTREESIZE;
> size -= PTRTREESIZE;
> +#endif
> } else {
> pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
> if (!pte_dir) {
> @@ -258,19 +264,24 @@ void __iounmap(void *addr, unsigned long size)
> {
> unsigned long virtaddr = (unsigned long)addr;
> pgd_t *pgd_dir;
> + p4d_t *p4d_dir;
> + pud_t *pud_dir;
> pmd_t *pmd_dir;
> pte_t *pte_dir;
>
> while ((long)size > 0) {
> pgd_dir = pgd_offset_k(virtaddr);
> - if (pgd_bad(*pgd_dir)) {
> - printk("iounmap: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
> - pgd_clear(pgd_dir);
> + p4d_dir = p4d_offset(pgd_dir, virtaddr);
> + pud_dir = pud_offset(p4d_dir, virtaddr);
> + if (pud_bad(*pud_dir)) {
> + printk("iounmap: bad pgd(%08lx)\n", pud_val(*pud_dir));
> + pud_clear(pud_dir);
> return;
> }
> - pmd_dir = pmd_offset(pgd_dir, virtaddr);
> + pmd_dir = pmd_offset(pud_dir, virtaddr);
>
> if (CPU_IS_020_OR_030) {
> +#if CONFIG_PGTABLE_LEVELS == 3
> int pmd_off = (virtaddr/PTRTREESIZE) & 15;
> int pmd_type = pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK;
>
> @@ -281,6 +292,7 @@ void __iounmap(void *addr, unsigned long size)
> continue;
> } else if (pmd_type == 0)
> continue;
> +#endif
> }
>
> if (pmd_bad(*pmd_dir)) {
> @@ -307,6 +319,8 @@ void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
> {
> unsigned long virtaddr = (unsigned long)addr;
> pgd_t *pgd_dir;
> + p4d_t *p4d_dir;
> + pud_t *pud_dir;
> pmd_t *pmd_dir;
> pte_t *pte_dir;
>
> @@ -341,14 +355,17 @@ void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
>
> while ((long)size > 0) {
> pgd_dir = pgd_offset_k(virtaddr);
> - if (pgd_bad(*pgd_dir)) {
> - printk("iocachemode: bad pgd(%08lx)\n", pgd_val(*pgd_dir));
> - pgd_clear(pgd_dir);
> + p4d_dir = p4d_offset(pgd_dir, virtaddr);
> + pud_dir = pud_offset(p4d_dir, virtaddr);
> + if (pud_bad(*pud_dir)) {
> + printk("iocachemode: bad pud(%08lx)\n", pud_val(*pud_dir));
> + pud_clear(pud_dir);
> return;
> }
> - pmd_dir = pmd_offset(pgd_dir, virtaddr);
> + pmd_dir = pmd_offset(pud_dir, virtaddr);
>
> if (CPU_IS_020_OR_030) {
> +#if CONFIG_PGTABLE_LEVELS == 3
> int pmd_off = (virtaddr/PTRTREESIZE) & 15;
>
> if ((pmd_dir->pmd[pmd_off] & _DESCTYPE_MASK) == _PAGE_PRESENT) {
> @@ -358,6 +375,7 @@ void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
> size -= PTRTREESIZE;
> continue;
> }
> +#endif
> }
>
> if (pmd_bad(*pmd_dir)) {
> diff --git a/arch/m68k/mm/mcfmmu.c b/arch/m68k/mm/mcfmmu.c
> index 6cb1e41..0ea3756 100644
> --- a/arch/m68k/mm/mcfmmu.c
> +++ b/arch/m68k/mm/mcfmmu.c
> @@ -92,6 +92,8 @@ int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
> unsigned long flags, mmuar, mmutr;
> struct mm_struct *mm;
> pgd_t *pgd;
> + p4d_t *p4d;
> + pud_t *pud;
> pmd_t *pmd;
> pte_t *pte;
> int asid;
> @@ -113,7 +115,19 @@ int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
> return -1;
> }
>
> - pmd = pmd_offset(pgd, mmuar);
> + p4d = p4d_offset(pgd, mmuar);
> + if (p4d_none(*p4d)) {
> + local_irq_restore(flags);
> + return -1;
> + }
> +
> + pud = pud_offset(p4d, mmuar);
> + if (pud_none(*pud)) {
> + local_irq_restore(flags);
> + return -1;
> + }
> +
> + pmd = pmd_offset(pud, mmuar);
> if (pmd_none(*pmd)) {
> local_irq_restore(flags);
> return -1;
> diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
> index 356601b..4857985 100644
> --- a/arch/m68k/mm/motorola.c
> +++ b/arch/m68k/mm/motorola.c
> @@ -82,9 +82,11 @@ static pmd_t * __init kernel_ptr_table(void)
> */
> last = (unsigned long)kernel_pg_dir;
> for (i = 0; i < PTRS_PER_PGD; i++) {
> - if (!pgd_present(kernel_pg_dir[i]))
> + pud_t *pud = (pud_t *)(&kernel_pg_dir[i]);
> +
> + if (!pud_present(*pud))
> continue;
> - pmd = __pgd_page(kernel_pg_dir[i]);
> + pmd = pgd_page_vaddr(kernel_pg_dir[i]);
> if (pmd > last)
> last = pmd;
> }
> @@ -118,6 +120,8 @@ static void __init map_node(int node)
> #define ROOTTREESIZE (32*1024*1024)
> unsigned long physaddr, virtaddr, size;
> pgd_t *pgd_dir;
> + p4d_t *p4d_dir;
> + pud_t *pud_dir;
> pmd_t *pmd_dir;
> pte_t *pte_dir;
>
> @@ -149,14 +153,16 @@ static void __init map_node(int node)
> continue;
> }
> }
> - if (!pgd_present(*pgd_dir)) {
> + p4d_dir = p4d_offset(pgd_dir, virtaddr);
> + pud_dir = pud_offset(p4d_dir, virtaddr);
> + if (!pud_present(*pud_dir)) {
> pmd_dir = kernel_ptr_table();
> #ifdef DEBUG
> printk ("[new pointer %p]", pmd_dir);
> #endif
> - pgd_set(pgd_dir, pmd_dir);
> + pud_set(pud_dir, pmd_dir);
> } else
> - pmd_dir = pmd_offset(pgd_dir, virtaddr);
> + pmd_dir = pmd_offset(pud_dir, virtaddr);
>
> if (CPU_IS_020_OR_030) {
> if (virtaddr) {
> @@ -304,4 +310,3 @@ void __init paging_init(void)
> node_set_state(i, N_NORMAL_MEMORY);
> }
> }
> -
>
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