diff options
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index fd3ee7a54a13..068522d8502a 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -600,8 +600,12 @@ pte_t *__page_check_address(struct page *page, struct mm_struct *mm, spinlock_t *ptl; if (unlikely(PageHuge(page))) { + /* when pud is not present, pte will be NULL */ pte = huge_pte_offset(mm, address); - ptl = &mm->page_table_lock; + if (!pte) + return NULL; + + ptl = huge_pte_lockptr(page_hstate(page), mm, pte); goto check; } @@ -665,25 +669,23 @@ int page_referenced_one(struct page *page, struct vm_area_struct *vma, unsigned long *vm_flags) { struct mm_struct *mm = vma->vm_mm; + spinlock_t *ptl; int referenced = 0; if (unlikely(PageTransHuge(page))) { pmd_t *pmd; - spin_lock(&mm->page_table_lock); /* * rmap might return false positives; we must filter * these out using page_check_address_pmd(). */ pmd = page_check_address_pmd(page, mm, address, - PAGE_CHECK_ADDRESS_PMD_FLAG); - if (!pmd) { - spin_unlock(&mm->page_table_lock); + PAGE_CHECK_ADDRESS_PMD_FLAG, &ptl); + if (!pmd) goto out; - } if (vma->vm_flags & VM_LOCKED) { - spin_unlock(&mm->page_table_lock); + spin_unlock(ptl); *mapcount = 0; /* break early from loop */ *vm_flags |= VM_LOCKED; goto out; @@ -692,10 +694,9 @@ int page_referenced_one(struct page *page, struct vm_area_struct *vma, /* go ahead even if the pmd is pmd_trans_splitting() */ if (pmdp_clear_flush_young_notify(vma, address, pmd)) referenced++; - spin_unlock(&mm->page_table_lock); + spin_unlock(ptl); } else { pte_t *pte; - spinlock_t *ptl; /* * rmap might return false positives; we must filter |