linux-kernel - Re: [PATCH AUTOSEL 5.15 081/188] s390/nmi: add missing __pa/__va address conversion of extended save area

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Date:   Sat, 22 Jan 2022 14:18:37 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Christian Borntraeger <borntraeger@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>, gor@...ux.ibm.com,
        egorenar@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, ebiederm@...ssion.com,
        valentin.schneider@....com, rppt@...nel.org, iii@...ux.ibm.com,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.15 081/188] s390/nmi: add missing __pa/__va
 address conversion of extended save area

On Tue, Jan 18, 2022 at 09:18:40AM +0100, Christian Borntraeger wrote:
>Am 18.01.22 um 03:30 schrieb Sasha Levin:
>>From: Heiko Carstens <hca@...ux.ibm.com>
>>
>>[ Upstream commit 402ff5a3387dc8ec6987a80d3ce26b0c25773622 ]
>>
>>Add missing __pa/__va address conversion of machine check extended
>>save area designation, which is an absolute address.
>>
>
>vv
>>Note: this currently doesn't fix a real bug, since virtual addresses
>>are indentical to physical ones.
>^^
>
>Sasha,
>please note the disclaimer above. There will be plenty of such fixes
>in s390 code and there is no point in backporting single fixes to stable.
>It will provide no benefit on its own but adds a risk of regression.

Sure, I'll drop it. Thanks!

-- 
Thanks,
Sasha