proc: Make the PROC_I() and PDE() macros internal to procfs

Make the PROC_I() and PDE() macros internal to procfs.  This means making
PDE_DATA() out of line.  This could be made more optimal by storing
PDE()->data into inode->i_private.

Also provide a __PDE_DATA() that is inline and internal to procfs.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c
index e0043c7..505afc9 100644
--- a/fs/proc/proc_devtree.c
+++ b/fs/proc/proc_devtree.c
@@ -41,7 +41,7 @@
 
 static int property_proc_open(struct inode *inode, struct file *file)
 {
-	return single_open(file, property_proc_show, PDE_DATA(inode));
+	return single_open(file, property_proc_show, __PDE_DATA(inode));
 }
 
 static const struct file_operations property_proc_fops = {