diff options
Diffstat (limited to 'mm/process_vm_access.c')
| -rw-r--r-- | mm/process_vm_access.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c index 07514d41ebcc..84d0c7eada2b 100644 --- a/mm/process_vm_access.c +++ b/mm/process_vm_access.c @@ -88,24 +88,31 @@ static int process_vm_rw_single_vec(unsigned long addr, ssize_t rc = 0; unsigned long max_pages_per_loop = PVM_MAX_KMALLOC_PAGES / sizeof(struct pages *); + unsigned int flags = 0; /* Work out address and page range required */ if (len == 0) return 0; nr_pages = (addr + len - 1) / PAGE_SIZE - addr / PAGE_SIZE + 1; + if (vm_write) + flags |= FOLL_WRITE; + while (!rc && nr_pages && iov_iter_count(iter)) { int pages = min(nr_pages, max_pages_per_loop); + int locked = 1; size_t bytes; /* * Get the pages we're interested in. We must - * add FOLL_REMOTE because task/mm might not + * access remotely because task/mm might not * current/current->mm */ - pages = __get_user_pages_unlocked(task, mm, pa, pages, - vm_write, 0, process_pages, - FOLL_REMOTE); + down_read(&mm->mmap_sem); + pages = get_user_pages_remote(task, mm, pa, pages, flags, + process_pages, NULL, &locked); + if (locked) + up_read(&mm->mmap_sem); if (pages <= 0) return -EFAULT; |