[PATCH 2.5.62-mm3] objrmap fix for X

[Dave McCracken <dmccr@us.ibm.com>]

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--On Tuesday, February 25, 2003 15:46:26 -0600 Dave McCracken
<dmccr@us.ibm.com> wrote:

>> Keep the flag for now, find the escaped page under X, remove the flag
>> later?
> 
> It occurred to me I'm already using (abusing?) the flag for nonlinear
> pages, so I have to keep it.  I'll chase solutions for X.

Ok, the vm_ops->nopage function is set in drivers like drm and agp.  I
don't think it's reasonable to require all of them to set PageAnon.  So
here's a patch that tests the page on do_no_page and sets the flag
appropriately.

Dave McCracken

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--- 2.5.62-mm3/mm/memory.c	2003-02-25 11:40:38.000000000 -0600
+++ 2.5.62-mm3-new/mm/memory.c	2003-02-25 15:54:51.000000000 -0600
@@ -1325,6 +1325,10 @@
 	if (!pte_chain)
 		goto oom;
 
+	/* See if nopage returned an anon page */
+	if (!new_page->mapping || PageSwapCache(new_page))
+		SetPageAnon(new_page);
+
 	/*
 	 * Should we do an early C-O-W break?
 	 */