SLES10 Fixes (part 8)

- Add compat_ioctl() handler, by default 64-bit SLES systems build 32-bit
  ELF binaries.  For the 32-bit binaries to pass ioctl information to a
  64-bit kernel a compatibility handler needs to be registered.  In our
  case no additional conversions are needed to convert 32-bit ioctl()
  commands to 64-bit commands so we can just call the default handler.

module/splat/splat-ctl.c

@@ -460,6 +460,15 @@ splat_ioctl(struct inode *inode, struct file *file,
 	return rc;
 }
 
+#ifdef CONFIG_COMPAT
+/* Compatibility handler for ioctls from 32-bit ELF binaries */
+static long
+splat_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	return splat_ioctl(NULL, file, cmd, arg);
+}
+#endif /* CONFIG_COMPAT */
+
 /* I'm not sure why you would want to write in to this buffer from
  * user space since its principle use is to pass test status info
  * back to the user space, but I don't see any reason to prevent it.
@@ -577,6 +586,9 @@ static struct file_operations splat_fops = {
 	.open		= splat_open,
 	.release	= splat_release,
 	.ioctl		= splat_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= splat_compat_ioctl,
+#endif
 	.read		= splat_read,
 	.write		= splat_write,
 	.llseek		= splat_seek,