[PATCH v2] vhost: add vsock compat ioctl

[Sonny Rao]

This will allow usage of vsock from 32-bit binaries on a 64-bit
kernel.

Signed-off-by: Sonny Rao <sonny...@chromium.org>
---
 drivers/vhost/vsock.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 0d14e2ff19f16..ee0c385d9fe54 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -699,12 +699,23 @@ static long vhost_vsock_dev_ioctl(struct file *f, 
unsigned int ioctl,
        }
 }
 
+#ifdef CONFIG_COMPAT
+static long vhost_vsock_dev_compat_ioctl(struct file *f, unsigned int ioctl,
+                                        unsigned long arg)
+{
+       return vhost_vsock_dev_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static const struct file_operations vhost_vsock_fops = {
        .owner          = THIS_MODULE,
        .open           = vhost_vsock_dev_open,
        .release        = vhost_vsock_dev_release,
        .llseek         = noop_llseek,
        .unlocked_ioctl = vhost_vsock_dev_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl   = vhost_vsock_dev_compat_ioctl,
+#endif
 };
 
 static struct miscdevice vhost_vsock_misc = {
-- 
2.13.5