xen/privcmd-buf.c: convert to use vm_map_pages_zero()

Convert to use vm_map_pages_zero() to map range of kernel memory to user vma. This driver has ignored vm_pgoff. We could later "fix" these drivers to behave according to the normal vm_pgoff offsetting simply by removing the _zero suffix on the function name and if that causes regressions, it gives us an easy way to revert.

Souptick Joarder committed 7 years ago

Commit 53269051 parent df9bde01 file · +2 −6Browse files

Unified · Split

drivers/xen/privcmd-buf.c+2−6

@@ -165,12 +165,8 @@ static int privcmd_buf_mmap(struct file file, struct vm_area_struct vma) · 164 unmodified lines
165	165	if (vma_priv->n_pages != count)
166	166	ret = -ENOMEM;
167	167	else
168		− for (i = 0; i < vma_priv->n_pages; i++) {
169		− ret = vm_insert_page(vma, vma->vm_start + i * PAGE_SIZE,
170		− vma_priv->pages[i]);
171		− if (ret)
172		− break;
173		− }
	168	+ ret = vm_map_pages_zero(vma, vma_priv->pages,
	169	+ vma_priv->n_pages);
174	170
175	171	if (ret)
176	172	privcmd_buf_vmapriv_free(vma_priv);