linux-kernel - Re: x86_64: potential critical issue with quicklists and page table pages

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Message-ID: <Pine.LNX.4.64.0709211249330.18088@schroedinger.engr.sgi.com>
Date:	Fri, 21 Sep 2007 12:56:55 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	akpm@...ux-foundation.org, ak@...e.de,
	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	asit.k.mallick@...el.com
Subject: Re: x86_64: potential critical issue with quicklists and page table
 pages

On Fri, 21 Sep 2007, Linus Torvalds wrote:

> The problem with that commit that I just reverted was that it mixed the 
> two, but not completely. It still kept them separate.

The quicklists have a long history and this bug has therefore also been in 
IA64 for a long time and it also likely exists on sparc64, sh and sh64. We 
need the patch that I posted to fix the other platforms. And with this fix 
there would be nothing amiss on x86_64 either.

---
 include/linux/quicklist.h |    8 --------
 1 file changed, 8 deletions(-)

Index: linux-2.6/include/linux/quicklist.h
===================================================================
--- linux-2.6.orig/include/linux/quicklist.h	2007-09-21 11:46:44.000000000 -0700
+++ linux-2.6/include/linux/quicklist.h	2007-09-21 11:55:01.000000000 -0700
@@ -56,14 +56,6 @@ static inline void __quicklist_free(int 
 	struct page *page)
 {
 	struct quicklist *q;
-	int nid = page_to_nid(page);
-
-	if (unlikely(nid != numa_node_id())) {
-		if (dtor)
-			dtor(p);
-		__free_page(page);
-		return;
-	}
 
 	q = &get_cpu_var(quicklist)[nr];
 	*(void **)p = q->page;
-
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