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-rw-r--r--lib/test_hmm.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/test_hmm.c b/lib/test_hmm.c
index e2ce8f9b7605..767538089a62 100644
--- a/lib/test_hmm.c
+++ b/lib/test_hmm.c
@@ -1086,9 +1086,33 @@ static long dmirror_fops_unlocked_ioctl(struct file *filp,
return 0;
}
+static int dmirror_fops_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ unsigned long addr;
+
+ for (addr = vma->vm_start; addr < vma->vm_end; addr += PAGE_SIZE) {
+ struct page *page;
+ int ret;
+
+ page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!page)
+ return -ENOMEM;
+
+ ret = vm_insert_page(vma, addr, page);
+ if (ret) {
+ __free_page(page);
+ return ret;
+ }
+ put_page(page);
+ }
+
+ return 0;
+}
+
static const struct file_operations dmirror_fops = {
.open = dmirror_fops_open,
.release = dmirror_fops_release,
+ .mmap = dmirror_fops_mmap,
.unlocked_ioctl = dmirror_fops_unlocked_ioctl,
.llseek = default_llseek,
.owner = THIS_MODULE,