linux-kernel - Re: [PATCH] powerpc/hotplug-mem: Fix aa

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Message-Id: <b50a28ec-ae33-82f8-eefd-0e20e15c2dfb@linux.vnet.ibm.com>
Date:   Tue, 30 May 2017 12:35:46 -0500
From:   Nathan Fontenot <nfont@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Michael Bringmann <mwb@...ux.vnet.ibm.com>, paulus@...ba.org,
        sahilmehta17@...il.com, jallen@...ux.vnet.ibm.com,
        alastair@...ilva.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/hotplug-mem: Fix aa_index match bug for hotplug

On 05/30/2017 06:41 AM, Michael Ellerman wrote:
> Michael Bringmann <mwb@...ux.vnet.ibm.com> writes:
> 
>> When adding or removing memory, the aa_index (affinity value) for the
>> memblock must also be converted to match the endianness of the rest
>> of the 'ibm,dynamic-memory' property.  Otherwise, subsequent retrieval
>> of the attribute will likely lead to non-existent nodes, followed by
>> using the default node in the code inappropriately.
>>
>> Signed-off-by: Michael Bringmann <mwb@...ux.vnet.ibm.com>
>>
>> diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
>> index e104c71..1fb162b 100644
>> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
>> +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
>> @@ -124,6 +124,7 @@ static struct property *dlpar_clone_drconf_property(struct device_node *dn)
>>  	for (i = 0; i < num_lmbs; i++) {
>>  		lmbs[i].base_addr = be64_to_cpu(lmbs[i].base_addr);
>>  		lmbs[i].drc_index = be32_to_cpu(lmbs[i].drc_index);
>> +		lmbs[i].aa_index = be32_to_cpu(lmbs[i].aa_index);
>>  		lmbs[i].flags = be32_to_cpu(lmbs[i].flags);
>>  	}
>>  
> 
> AFAICS this code was added in commit 5f97b2a0d176 ("powerpc/pseries:
> Implement memory hotplug add in the kernel").
> 
> So this should probably be marked:
> 
>   Fixes: 5f97b2a0d176 ("powerpc/pseries: Implement memory hotplug add in the kernel")
> 
> And it seems like a bug we'd want fixed in stable, so:
> 
>   Cc: stable@...r.kernel.org # v4.1+
> 
> 
> Am I right?

Yes, that is correct.

-Nathan