linux-kernel - [PATCH] Fix find_next_best_node (Re: [BUG] 2.6.23-rc3-mm1 Kernel panic - not syncing: DMA: Memory would be corrupted)

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Date:	Fri, 24 Aug 2007 15:53:25 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Mel Gorman" <mel@...net.ie>,
	"Kamalesh Babulal" <kamalesh@...ux.vnet.ibm.com>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	"Jeremy Higdon" <jeremy@....com>, "Andi Kleen" <ak@...e.de>,
	<linux-kernel@...r.kernel.org>,
	"Balbir Singh" <balbir@...ux.vnet.ibm.com>,
	<linux-ia64@...r.kernel.org>, Christoph Lameter <clameter@....com>,
	linux-mm@...ck.org
Subject: [PATCH] Fix find_next_best_node (Re: [BUG] 2.6.23-rc3-mm1 Kernel panic - not syncing: DMA: Memory would be corrupted)


I found find_next_best_node() was wrong.
I confirmed boot up by the following patch.
Mel-san, Kamalesh-san, could you try this?

Bye.
---

Fix decision of memoryless node in find_next_best_node().
This can be cause of SW-IOMMU's allocation failure.

This patch is for 2.6.23-rc3-mm1.

Signed-off-by: Yasunori Goto <y-goto@...fujitsu.com>

---
 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: current/mm/page_alloc.c
===================================================================
--- current.orig/mm/page_alloc.c	2007-08-24 16:03:17.000000000 +0900
+++ current/mm/page_alloc.c	2007-08-24 16:04:06.000000000 +0900
@@ -2136,7 +2136,7 @@ static int find_next_best_node(int node,
 		 * Note:  N_HIGH_MEMORY state not guaranteed to be
 		 *        populated yet.
 		 */
-		if (pgdat->node_present_pages)
+		if (!pgdat->node_present_pages)
 			continue;
 
 		/* Don't want a node to appear more than once */

-- 
Yasunori Goto 


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