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VM: add common helper function to create the page tables 

This logic was duplicated four times, for no good reason.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Linus Torvalds 2005-11-29 14:03:14 -08:00
parent 4168f7a318
commit c9cfcddfd6
4 changed files with 19 additions and 45 deletions
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12
fs/exec.c
View File

@ -306,9 +306,6 @@ void install_arg_page(struct vm_area_struct *vma,
struct page *page, unsigned long address)
{
struct mm_struct *mm = vma->vm_mm;
pgd_t * pgd;
pud_t * pud;
pmd_t * pmd;
pte_t * pte;
spinlock_t *ptl;
@ -316,14 +313,7 @@ void install_arg_page(struct vm_area_struct *vma,
goto out;
flush_dcache_page(page);
pgd = pgd_offset(mm, address);
pud = pud_alloc(mm, pgd, address);
if (!pud)
goto out;
pmd = pmd_alloc(mm, pud, address);
if (!pmd)
goto out;
pte = pte_alloc_map_lock(mm, pmd, address, &ptl);
pte = get_locked_pte(mm, address, &ptl);
if (!pte)
goto out;
if (!pte_none(*pte)) {

2
include/linux/mm.h
View File

@ -742,6 +742,8 @@ struct shrinker;
extern struct shrinker *set_shrinker(int, shrinker_t);
extern void remove_shrinker(struct shrinker *shrinker);
extern pte_t *FASTCALL(get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl));
int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address);
int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address);
int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address);

24
mm/fremap.c
View File

@ -55,20 +55,10 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
pgoff_t size;
int err = -ENOMEM;
pte_t *pte;
pmd_t *pmd;
pud_t *pud;
pgd_t *pgd;
pte_t pte_val;
spinlock_t *ptl;
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
if (!pud)
goto out;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
goto out;
pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
pte = get_locked_pte(mm, addr, &ptl);
if (!pte)
goto out;
@ -110,20 +100,10 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
{
int err = -ENOMEM;
pte_t *pte;
pmd_t *pmd;
pud_t *pud;
pgd_t *pgd;
pte_t pte_val;
spinlock_t *ptl;
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
if (!pud)
goto out;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
goto out;
pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
pte = get_locked_pte(mm, addr, &ptl);
if (!pte)
goto out;

26
mm/memory.c
View File

@ -1146,6 +1146,18 @@ int zeromap_page_range(struct vm_area_struct *vma,
return err;
}
pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl)
{
pgd_t * pgd = pgd_offset(mm, addr);
pud_t * pud = pud_alloc(mm, pgd, addr);
if (pud) {
pmd_t * pmd = pmd_alloc(mm, pgd, addr);
if (pmd)
return pte_alloc_map_lock(mm, pmd, addr, ptl);
}
return NULL;
}
/*
* This is the old fallback for page remapping.
*
@ -1156,10 +1168,7 @@ int zeromap_page_range(struct vm_area_struct *vma,
static int insert_page(struct mm_struct *mm, unsigned long addr, struct page *page, pgprot_t prot)
{
int retval;
pgd_t * pgd;
pud_t * pud;
pmd_t * pmd;
pte_t * pte;
pte_t *pte;
spinlock_t *ptl;
retval = -EINVAL;
@ -1167,14 +1176,7 @@ static int insert_page(struct mm_struct *mm, unsigned long addr, struct page *pa
goto out;
retval = -ENOMEM;
flush_dcache_page(page);
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
if (!pud)
goto out;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
goto out;
pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
pte = get_locked_pte(mm, addr, &ptl);
if (!pte)
goto out;
retval = -EBUSY;