diff options
| author | Andi Kleen <ak@suse.de> | 2004-12-31 22:01:09 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@evo.osdl.org> | 2004-12-31 22:01:09 -0800 |
| commit | 31382a8d8303ce517d768117cce7317e6198fe54 (patch) | |
| tree | 3e343f83de07d5c3e9606a05170940234a898c7a /include/linux | |
| parent | 5787c69856afc13985ce7d4d5936126851e841bf (diff) | |
[PATCH] convert Linux to 4-level page tables
Extend the Linux MM to 4level page tables.
This is the core patch for mm/*, fs/*, include/linux/*
It breaks all architectures, which will be fixed in separate patches.
The conversion is quite straight forward. All the functions walking the page
table hierarchy have been changed to deal with another level at the top. The
additional level is called pml4.
mm/memory.c has changed a lot because it did most of the heavy lifting here.
Most of the changes here are extensions of the previous code.
Signed-off-by: Andi Kleen <ak@suse.de>
Converted by Nick Piggin to use the pud_t 'page upper' level between pgd
and pmd instead of Andi's pml4 level above pgd.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mm.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 6d631e3fd0e7..f83139ff83e3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -581,7 +581,8 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping, } extern int vmtruncate(struct inode * inode, loff_t offset); -extern pmd_t *FASTCALL(__pmd_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)); +extern pud_t *FASTCALL(__pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)); +extern pmd_t *FASTCALL(__pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)); extern pte_t *FASTCALL(pte_alloc_kernel(struct mm_struct *mm, pmd_t *pmd, unsigned long address)); extern pte_t *FASTCALL(pte_alloc_map(struct mm_struct *mm, pmd_t *pmd, unsigned long address)); extern int install_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, struct page *page, pgprot_t prot); @@ -626,15 +627,22 @@ extern struct shrinker *set_shrinker(int, shrinker_t); extern void remove_shrinker(struct shrinker *shrinker); /* - * On a two-level page table, this ends up being trivial. Thus the - * inlining and the symmetry break with pte_alloc_map() that does all + * On a two-level or three-level page table, this ends up being trivial. Thus + * the inlining and the symmetry break with pte_alloc_map() that does all * of this out-of-line. */ -static inline pmd_t *pmd_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) +static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) { if (pgd_none(*pgd)) - return __pmd_alloc(mm, pgd, address); - return pmd_offset(pgd, address); + return __pud_alloc(mm, pgd, address); + return pud_offset(pgd, address); +} + +static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) +{ + if (pud_none(*pud)) + return __pmd_alloc(mm, pud, address); + return pmd_offset(pud, address); } extern void free_area_init(unsigned long * zones_size); |