diff options
Diffstat (limited to 'mm/gup.c')
| -rw-r--r-- | mm/gup.c | 10 |
1 files changed, 7 insertions, 3 deletions
@@ -279,6 +279,8 @@ struct page *follow_page_mask(struct vm_area_struct *vma, spin_unlock(ptl); ret = 0; split_huge_pmd(vma, pmd, address); + if (pmd_trans_unstable(pmd)) + ret = -EBUSY; } else { get_page(page); spin_unlock(ptl); @@ -286,6 +288,8 @@ struct page *follow_page_mask(struct vm_area_struct *vma, ret = split_huge_page(page); unlock_page(page); put_page(page); + if (pmd_none(*pmd)) + return no_page_table(vma, flags); } return ret ? ERR_PTR(ret) : @@ -350,7 +354,6 @@ unmap: static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma, unsigned long address, unsigned int *flags, int *nonblocking) { - struct mm_struct *mm = vma->vm_mm; unsigned int fault_flags = 0; int ret; @@ -375,7 +378,7 @@ static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma, fault_flags |= FAULT_FLAG_TRIED; } - ret = handle_mm_fault(mm, vma, address, fault_flags); + ret = handle_mm_fault(vma, address, fault_flags); if (ret & VM_FAULT_ERROR) { if (ret & VM_FAULT_OOM) return -ENOMEM; @@ -690,7 +693,7 @@ retry: if (!vma_permits_fault(vma, fault_flags)) return -EFAULT; - ret = handle_mm_fault(mm, vma, address, fault_flags); + ret = handle_mm_fault(vma, address, fault_flags); major |= ret & VM_FAULT_MAJOR; if (ret & VM_FAULT_ERROR) { if (ret & VM_FAULT_OOM) @@ -720,6 +723,7 @@ retry: } return 0; } +EXPORT_SYMBOL_GPL(fixup_user_fault); static __always_inline long __get_user_pages_locked(struct task_struct *tsk, struct mm_struct *mm, |