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authorLinus Torvalds <torvalds@g5.osdl.org>2005-11-29 14:03:14 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-29 14:03:14 -0800
commitc9cfcddfd65735437a4cb8563d6b66a6da8a5ed6 (patch)
tree618cdf37baafe8b283bcc9923d9dde89d6428fb5
parent4168f7a31801bba6acc18662978d24ec850bbbd0 (diff)
downloadlinux-c9cfcddfd65735437a4cb8563d6b66a6da8a5ed6.tar.gz
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>
-rw-r--r--fs/exec.c12
-rw-r--r--include/linux/mm.h2
-rw-r--r--mm/fremap.c24
-rw-r--r--mm/memory.c26
4 files changed, 19 insertions, 45 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 1f8a9fd2c9e..22533cce061 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -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)) {
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 74f90d7eb5e..0e73f1539d0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -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);
diff --git a/mm/fremap.c b/mm/fremap.c
index f851775e09c..9f381e58bf4 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -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;
diff --git a/mm/memory.c b/mm/memory.c
index 990e7dc666f..74f95ae0510 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -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;