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

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Message-ID: <87tw424lmh.fsf@concordia.ellerman.id.au>
Date:   Tue, 30 May 2017 21:41:58 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Michael Bringmann <mwb@...ux.vnet.ibm.com>, paulus@...ba.org,
        nfont@...ux.vnet.ibm.com, sahilmehta17@...il.com,
        jallen@...ux.vnet.ibm.com, mwb@...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

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?

cheers