linux-kernel - Re: [PATCH] x86/resctrl: Fix buggy overflow when reactivating previously Unavailable RMID

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Message-ID: <6c512e5a-0657-4f3e-83ac-7f8fa1de4c6c@amd.com>
Date: Wed, 8 Oct 2025 13:08:36 -0500
From: Babu Moger <babu.moger@....com>
To: Reinette Chatre <reinette.chatre@...el.com>, "Moger, Babu"
 <bmoger@....com>, tony.luck@...el.com, Dave.Martin@....com,
 james.morse@....com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com
Cc: x86@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
 peternewman@...gle.com, eranian@...gle.com, gautham.shenoy@....com
Subject: Re: [PATCH] x86/resctrl: Fix buggy overflow when reactivating
 previously Unavailable RMID

Hi Reinette,

On 10/7/25 22:04, Reinette Chatre wrote:
> Hi Babu,
>
> On 10/7/25 4:47 PM, Moger, Babu wrote:
>> On 10/7/2025 3:23 PM, Reinette Chatre wrote:
>>> On 10/6/25 4:13 PM, Babu Moger wrote:
> ...
>
>>>> ---
>>>>
>>>> Tested this on multiple AMD systems, but not on Intel systems.
>>>> Need help with that. If everything goes well, this patch needs to
>>>> go to all the stable kernels.
>>> Needs a "Fixes" and "Cc: stable@...r.kernel.org"?
>> Hmm.. Not sure. Which commit to add Fixes in. This is AMD related.
>> We should have taken care when adding support to AMD. Does this commit make sense?
>>
>> Fixes: 4d05bf71f157d ("x86/resctrl: Introduce AMD QOS feature")
> This seems fair. From what I can tell this spans all LTS kernels so I expect
> a couple of different variants of this fix since this code has evolved quite a lot.
> Do you want this fix backported to all the LTS kernels?
> It may be useful to add a note to the stable team that this patch needs changes to
> apply to all kernel versions (see "Point out known problems"
> in Documentation/process/stable-kernel-rules.rst)

Sure. Sending v2 will all the updates.

-- 
Thanks
Babu Moger