linux-kernel - Re: [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 22:16:40 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Yasunori Goto <y-goto@...fujitsu.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@...net.ie>, "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: Re: [PATCH] Fix find_next_best_node (Re: [BUG] 2.6.23-rc3-mm1 Kernel
 panic - not syncing: DMA: Memory would be corrupted)

Yasunori Goto wrote:
> 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 */
>
>   
This patch resolves the kernel panic problem.

-
Kamalesh Babulal.
-
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