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mm: introduce mm_find_pmd()

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Several place need to find the pmd by(mm_struct, address), so introduce a
function to simplify it.

[akpm@linux-foundation.org: fix warning]
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Ni zhan Chen <nizhan.chen@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bob Liu
2012-12-11 16:00:37 -08:00
committed by Linus Torvalds
parent 344aa35c27
commit 6219049ae1
5 changed files with 44 additions and 92 deletions
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14
mm/migrate.c
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@@ -91,8 +91,6 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
{
struct mm_struct *mm = vma->vm_mm;
swp_entry_t entry;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *ptep, pte;
spinlock_t *ptl;
@@ -103,19 +101,11 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
goto out;
ptl = &mm->page_table_lock;
} else {
pgd = pgd_offset(mm, addr);
if (!pgd_present(*pgd))
pmd = mm_find_pmd(mm, addr);
if (!pmd)
goto out;
pud = pud_offset(pgd, addr);
if (!pud_present(*pud))
goto out;
pmd = pmd_offset(pud, addr);
if (pmd_trans_huge(*pmd))
goto out;
if (!pmd_present(*pmd))
goto out;
ptep = pte_offset_map(pmd, addr);