[Xen-devel] [RESEND PATCH v4 9/9] xen/privcmd-buf.c: Convert to use vm_map_pages_zero()

[Souptick Joarder <jrdr.linux@xxxxxxxxx>]

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.

Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 drivers/xen/privcmd-buf.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/xen/privcmd-buf.c b/drivers/xen/privcmd-buf.c
index de01a6d..d02dc43 100644
--- a/drivers/xen/privcmd-buf.c
+++ b/drivers/xen/privcmd-buf.c
@@ -166,12 +166,8 @@ static int privcmd_buf_mmap(struct file *file, struct 
vm_area_struct *vma)
        if (vma_priv->n_pages != count)
                ret = -ENOMEM;
        else
-               for (i = 0; i < vma_priv->n_pages; i++) {
-                       ret = vm_insert_page(vma, vma->vm_start + i * PAGE_SIZE,
-                                            vma_priv->pages[i]);
-                       if (ret)
-                               break;
-               }
+               ret = vm_map_pages_zero(vma, vma_priv->pages,
+                                               vma_priv->n_pages);
 
        if (ret)
                privcmd_buf_vmapriv_free(vma_priv);
-- 
1.9.1


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