Re: [PATCH Bug fix] acpi, movablemem_map: node0 should always be unhotpluggable when using SRAT.

[Tang Chen <tangchen@cn.fujitsu.com>]

On 01/30/2013 04:50 PM, David Rientjes wrote:
> On Wed, 30 Jan 2013, Tang Chen wrote:
>
>> When using movablemem_map=acpi, always set node0 as unhotpluggable, otherwise
>> if all the memory is hotpluggable, the kernel will fail to boot.
>>
>> When using movablemem_map=nn[KMG]@ss[KMG], we don't stop users specifying
>> node0 as hotpluggable, and ignore all the info in SRAT, so that this option
>> can be used as a workaround of firmware bugs.
>>
>
> Could you elaborate on the failure you're seeing?
>
> I've booted the kernel many times without memory on a node 0.
>

Hi David,

The failure I'm trying to fix is that if all the memory is hotpluggable, 
and user
specified movablemem_map, my code will set all the memory as 
ZONE_MOVABLE, and kernel
will fail to allocate any memory, and it will fail to boot.

But I'm sorry if I didn't answer your question. :)

Are you saying your memory is not on node0, and your physical address
0x0 is not on node0 ? And your /sys fs don't have a node0 interface, it is
node1 or something else ?

If so, I think I'd better find another way to fix this problem because 
node0 may not be
the first node on the system.

Thanks. :)

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