diff options
| -rw-r--r-- | mm/huge_memory.c | 55 | ||||
| -rw-r--r-- | mm/internal.h | 5 | ||||
| -rw-r--r-- | mm/ksm.c | 14 | ||||
| -rw-r--r-- | mm/migrate.c | 14 | ||||
| -rw-r--r-- | mm/rmap.c | 48 |
5 files changed, 44 insertions, 92 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 6f022f505e8..9ae97242aa8 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 diff --git a/mm/internal.h b/mm/internal.h index a4fa284f6bc..52d1fa95719 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -92,6 +92,11 @@ extern int isolate_lru_page(struct page *page); extern void putback_lru_page(struct page *page); /* + * in mm/rmap.c: + */ +extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); + +/* * in mm/page_alloc.c */ extern void __free_pages_bootmem(struct page *page, unsigned int order); @@ -778,8 +778,6 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, struct page *kpage, pte_t orig_pte) { struct mm_struct *mm = vma->vm_mm; - pgd_t *pgd; - pud_t *pud; pmd_t *pmd; pte_t *ptep; spinlock_t *ptl; @@ -792,18 +790,10 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, if (addr == -EFAULT) goto out; - 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); BUG_ON(pmd_trans_huge(*pmd)); - if (!pmd_present(*pmd)) - goto out; mmun_start = addr; mmun_end = addr + PAGE_SIZE; diff --git a/mm/migrate.c b/mm/migrate.c index 77ed2d77370..1dc4598d251 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -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); diff --git a/mm/rmap.c b/mm/rmap.c index 2ee1ef0f317..46823fb0e80 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -562,6 +562,27 @@ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma) return address; } +pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd = NULL; + + pgd = pgd_offset(mm, address); + if (!pgd_present(*pgd)) + goto out; + + pud = pud_offset(pgd, address); + if (!pud_present(*pud)) + goto out; + + pmd = pmd_offset(pud, address); + if (!pmd_present(*pmd)) + pmd = NULL; +out: + return pmd; +} + /* * Check that @page is mapped at @address into @mm. * @@ -574,8 +595,6 @@ unsigned long page_address_in_vma(struct page *page, struct vm_area_struct *vma) pte_t *__page_check_address(struct page *page, struct mm_struct *mm, unsigned long address, spinlock_t **ptlp, int sync) { - pgd_t *pgd; - pud_t *pud; pmd_t *pmd; pte_t *pte; spinlock_t *ptl; @@ -586,17 +605,10 @@ pte_t *__page_check_address(struct page *page, struct mm_struct *mm, goto check; } - pgd = pgd_offset(mm, address); - if (!pgd_present(*pgd)) - return NULL; - - pud = pud_offset(pgd, address); - if (!pud_present(*pud)) + pmd = mm_find_pmd(mm, address); + if (!pmd) return NULL; - pmd = pmd_offset(pud, address); - if (!pmd_present(*pmd)) - return NULL; if (pmd_trans_huge(*pmd)) return NULL; @@ -1345,8 +1357,6 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount, struct vm_area_struct *vma, struct page *check_page) { struct mm_struct *mm = vma->vm_mm; - pgd_t *pgd; - pud_t *pud; pmd_t *pmd; pte_t *pte; pte_t pteval; @@ -1366,16 +1376,8 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount, if (end > vma->vm_end) end = vma->vm_end; - pgd = pgd_offset(mm, address); - if (!pgd_present(*pgd)) - return ret; - - pud = pud_offset(pgd, address); - if (!pud_present(*pud)) - return ret; - - pmd = pmd_offset(pud, address); - if (!pmd_present(*pmd)) + pmd = mm_find_pmd(mm, address); + if (!pmd) return ret; mmun_start = address; |