diff options
Diffstat (limited to 'mm/userfaultfd.c')
| -rw-r--r-- | mm/userfaultfd.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 065c1ce191c4..d59b5a73dfb3 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -267,14 +267,10 @@ retry: VM_BUG_ON(dst_addr & ~huge_page_mask(h)); /* - * Serialize via i_mmap_rwsem and hugetlb_fault_mutex. - * i_mmap_rwsem ensures the dst_pte remains valid even - * in the case of shared pmds. fault mutex prevents - * races with other faulting threads. + * Serialize via hugetlb_fault_mutex */ - mapping = dst_vma->vm_file->f_mapping; - i_mmap_lock_read(mapping); idx = linear_page_index(dst_vma, dst_addr); + mapping = dst_vma->vm_file->f_mapping; hash = hugetlb_fault_mutex_hash(h, dst_mm, dst_vma, mapping, idx, dst_addr); mutex_lock(&hugetlb_fault_mutex_table[hash]); @@ -283,7 +279,6 @@ retry: dst_pte = huge_pte_alloc(dst_mm, dst_addr, huge_page_size(h)); if (!dst_pte) { mutex_unlock(&hugetlb_fault_mutex_table[hash]); - i_mmap_unlock_read(mapping); goto out_unlock; } @@ -291,7 +286,6 @@ retry: dst_pteval = huge_ptep_get(dst_pte); if (!huge_pte_none(dst_pteval)) { mutex_unlock(&hugetlb_fault_mutex_table[hash]); - i_mmap_unlock_read(mapping); goto out_unlock; } @@ -299,7 +293,6 @@ retry: dst_addr, src_addr, &page); mutex_unlock(&hugetlb_fault_mutex_table[hash]); - i_mmap_unlock_read(mapping); vm_alloc_shared = vm_shared; cond_resched(); |