diff options
| author | Bob Liu <lliubbo@gmail.com> | 2012-12-12 04:00:37 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-12 05:22:22 +0400 |
| commit | 6219049ae1ce32b89236646cccaec2a5fc6c4fd2 (patch) | |
| tree | 551e8b1d53b8d237678c96cb9b442c746609cfcd /mm/huge_memory.c | |
| parent | 344aa35c27acdf70d3c67b5aa7cb6aa8585f80c1 (diff) | |
| download | linux-6219049ae1ce32b89236646cccaec2a5fc6c4fd2.tar.xz | |
mm: introduce mm_find_pmd()
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>
Diffstat (limited to 'mm/huge_memory.c')
| -rw-r--r-- | mm/huge_memory.c | 55 |
1 files changed, 10 insertions, 45 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 6f022f505e88..9ae97242aa8d 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1146,22 +1146,14 @@ pmd_t *page_check_address_pmd(struct page *page, unsigned long address, enum page_check_address_pmd_flag flag) { - pgd_t *pgd; - pud_t *pud; pmd_t *pmd, *ret = NULL; if (address & ~HPAGE_PMD_MASK) goto out; - pgd = pgd_offset(mm, address); - if (!pgd_present(*pgd)) + pmd = mm_find_pmd(mm, address); + if (!pmd) goto out; - - pud = pud_offset(pgd, address); - if (!pud_present(*pud)) - goto out; - - pmd = pmd_offset(pud, address); if (pmd_none(*pmd)) goto out; if (pmd_page(*pmd) != page) @@ -1908,8 +1900,6 @@ static void collapse_huge_page(struct mm_struct *mm, struct vm_area_struct *vma, int node) { - pgd_t *pgd; - pud_t *pud; pmd_t *pmd, _pmd; pte_t *pte; pgtable_t pgtable; @@ -1955,17 +1945,10 @@ static void collapse_huge_page(struct mm_struct *mm, goto out; VM_BUG_ON(vma->vm_flags & VM_NO_THP); - pgd = pgd_offset(mm, address); - if (!pgd_present(*pgd)) + pmd = mm_find_pmd(mm, address); + if (!pmd) goto out; - - pud = pud_offset(pgd, address); - if (!pud_present(*pud)) - goto out; - - pmd = pmd_offset(pud, address); - /* pmd can't go away or become huge under us */ - if (!pmd_present(*pmd) || pmd_trans_huge(*pmd)) + if (pmd_trans_huge(*pmd)) goto out; anon_vma_lock(vma->anon_vma); @@ -2048,8 +2031,6 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, unsigned long address, struct page **hpage) { - pgd_t *pgd; - pud_t *pud; pmd_t *pmd; pte_t *pte, *_pte; int ret = 0, referenced = 0, none = 0; @@ -2060,16 +2041,10 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, VM_BUG_ON(address & ~HPAGE_PMD_MASK); - pgd = pgd_offset(mm, address); - if (!pgd_present(*pgd)) + pmd = mm_find_pmd(mm, address); + if (!pmd) goto out; - - pud = pud_offset(pgd, address); - if (!pud_present(*pud)) - goto out; - - pmd = pmd_offset(pud, address); - if (!pmd_present(*pmd) || pmd_trans_huge(*pmd)) + if (pmd_trans_huge(*pmd)) goto out; pte = pte_offset_map_lock(mm, pmd, address, &ptl); @@ -2363,22 +2338,12 @@ void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd) static void split_huge_page_address(struct mm_struct *mm, unsigned long address) { - pgd_t *pgd; - pud_t *pud; pmd_t *pmd; VM_BUG_ON(!(address & ~HPAGE_PMD_MASK)); - pgd = pgd_offset(mm, address); - if (!pgd_present(*pgd)) - return; - - pud = pud_offset(pgd, address); - if (!pud_present(*pud)) - return; - - pmd = pmd_offset(pud, address); - if (!pmd_present(*pmd)) + pmd = mm_find_pmd(mm, address); + if (!pmd) return; /* * Caller holds the mmap_sem write mode, so a huge pmd cannot |