linux-kernel - Re: [ PATCH stable v4.19] EDAC: Drop per-memory controller buses

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Date:   Tue, 17 Mar 2020 11:22:49 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Manali K Shukla <manashuk@...co.com>
Cc:     bp@...en8.de, linux-edac@...r.kernel.org, mchehab@...nel.org,
        linux-kernel@...r.kernel.org, xe-linux-external@...co.com,
        Borislav Petkov <bp@...e.de>,
        Aristeu Rozanski Filho <arozansk@...hat.com>,
        Justin Ernst <justin.ernst@....com>,
        Russ Anderson <rja@....com>, Tony Luck <tony.luck@...el.com>
Subject: Re: [ PATCH stable v4.19] EDAC: Drop per-memory controller buses

On Wed, Mar 11, 2020 at 10:22:01PM -0700, Manali K Shukla wrote:
> From: Borislav Petkov <bp@...e.de>
> 
> upstream 861e6ed667c83d64a42b0db41a22d6b4de4e913f commit
> 
> ... and use the single edac_subsys object returned from
> subsys_system_register(). The idea is to have a single bus
> and multiple devices on it.
> 
> Signed-off-by: Borislav Petkov <bp@...e.de>
> Acked-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
> CC: Aristeu Rozanski Filho <arozansk@...hat.com>
> CC: Greg KH <gregkh@...uxfoundation.org>
> CC: Justin Ernst <justin.ernst@....com>
> CC: linux-edac <linux-edac@...r.kernel.org>
> CC: Mauro Carvalho Chehab <mchehab@...nel.org>
> CC: Russ Anderson <rja@....com>
> Cc: Tony Luck <tony.luck@...el.com>
> Link: https://lkml.kernel.org/r/20180926152752.GG5584@zn.tnic
> [Manali: backport to v4.19 -stable :
> - removing per-MC bus, this enables to get rid of memory controllers
>   maximum number notion
> - value of max number of memory controllers is 2 * MAX_NUMNODES. On two nodes system MAX_NUMNODES value is ‘1’ and
>   so value of max number of memory controller becomes ‘2’, this patch fixes this issue when there are only 2 nodes on the system
>   and number of memory controllers are more than ‘2’]
> (cherry picked from commit 861e6ed667c83d64a42b0db41a22d6b4de4e913f)
> Signed-off-by: Manali K Shukla <manashuk@...co.com>

Why is this a patch for the stable trees?  What problem does it solve?

thanks,

greg k-h-