linux-kernel - Re: [PATCH] powerpc/hotplug: assign hot added LMB to the right node

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Date:   Fri, 4 Dec 2020 09:12:38 +0100
From:   Laurent Dufour <ldufour@...ux.ibm.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Scott Cheloha <cheloha@...ux.ibm.com>, stable@...r.kernel.org
Subject: Re: [PATCH] powerpc/hotplug: assign hot added LMB to the right node

Le 03/12/2020 à 19:25, Greg KH a écrit :
> On Thu, Dec 03, 2020 at 11:15:14AM +0100, Laurent Dufour wrote:
>> This patch applies to 5.9 and earlier kernels only.
>>
>> Since 5.10, this has been fortunately fixed by the commit
>> e5e179aa3a39 ("pseries/drmem: don't cache node id in drmem_lmb struct").
> 
> Why can't we just backport that patch instead?  It's almost always
> better to do that than to have a one-off patch, as almost always those
> have bugs in them.

That's a good option too.
I was thinking that this 5.10 patch was not matching the stable release's 
guidelines since it was targeting performance issue, but since it is also fixing 
this issue, I'm certainly wrong.

So, forget that patch.

Thanks,
Laurent.