linux-kernel - Re: [BUG] x86: bootmem broken on SGI UV

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Date:	Sat, 09 Oct 2010 11:06:34 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Robin Holt <holt@....com>
CC:	Russ Anderson <rja@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
	"H. Peter Anvin" <h.peter.anvin@...el.com>,
	Jack Steiner <steiner@....com>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [BUG] x86: bootmem broken on SGI UV

On 10/09/2010 09:39 AM, Robin Holt wrote:
> On Sat, Oct 09, 2010 at 07:59:45AM -0500, Russ Anderson wrote:
>> Yes, Yinghai's patch fixes the problem.
>> Thank you very much.
> 
> Will this be included in 2.6.36?  It is needed for boot in order for UV
> systems to boot.
> 

yes, it is needed for 2.6.33 .34 .35 .36

It is too late for put in 2.6.36. Linus already had -rc7, and assume he will have final .36 this week.

Yinghai

>>
>> On Fri, Oct 08, 2010 at 03:57:31PM -0700, Yinghai Lu wrote:
>>> On 10/08/2010 02:34 PM, Russ Anderson wrote:
>>>
>>> After looking at the changelog, it turns out it is broken for a while by
>>> following commit
>>>
>>> |commit 8716273caef7f55f39fe4fc6c69c5f9f197f41f1
>>> |Author: David Rientjes <rientjes@...gle.com>
>>> |Date:   Fri Sep 25 15:20:04 2009 -0700
>>> |
>>> |    x86: Export srat physical topology
>>>
>>> before that commit, register_active_regions() is called SRAT memory entries.
>>>
>>> Try to use nodememblk_range[] instead of nodes[].
>>>
>>> For stable tree: from 2.6.33 to 2.3.36 need this patch by
>>> changing memblock_x86_register_active_regions() with e820_register_active_regions()
>>>
>>> Reported-by: Russ Anderson <rja@....com>
>>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>>> Cc: stable@...nel.org
>>>
>>> ---
>>>  arch/x86/mm/srat_64.c |    8 +++++---
>>>  1 file changed, 5 insertions(+), 3 deletions(-)
>>>
>>> Index: linux-2.6/arch/x86/mm/srat_64.c
>>> ===================================================================
>>> --- linux-2.6.orig/arch/x86/mm/srat_64.c
>>> +++ linux-2.6/arch/x86/mm/srat_64.c
>>> @@ -421,9 +421,11 @@ int __init acpi_scan_nodes(unsigned long
>>>  		return -1;
>>>  	}
>>>  
>>> -	for_each_node_mask(i, nodes_parsed)
>>> -		memblock_x86_register_active_regions(i, nodes[i].start >> PAGE_SHIFT,
>>> -						nodes[i].end >> PAGE_SHIFT);
>>> +	for (i = 0; i < num_node_memblks; i++)
>>> +		memblock_x86_register_active_regions(memblk_nodeid[i],
>>> +						node_memblk_range[i].start >> PAGE_SHIFT,
>>> +						node_memblk_range[i].end >> PAGE_SHIFT);
>>> +
>>>  	/* for out of order entries in SRAT */
>>>  	sort_node_map();
>>>  	if (!nodes_cover_memory(nodes)) {
>>
>> -- 
>> Russ Anderson, OS RAS/Partitioning Project Lead  
>> SGI - Silicon Graphics Inc          rja@....com
>> --
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