linux-kernel - Re: [PATCH] cpufreq: powernv: Define methods to parse positive & negative pstates

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87r2s8dt3w.fsf@concordia.ellerman.id.au>
Date:   Wed, 06 Dec 2017 21:54:27 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        linux-pm@...r.kernel.org
Cc:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>,
        viresh.kumar@...aro.org, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, huntbag@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, akshay.adiga@...ux.vnet.ibm.com
Subject: Re: [PATCH] cpufreq: powernv: Define methods to parse positive & negative pstates

Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com> writes:

> From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
>
> Pstates are 8bit values but on POWER8 they are negative and on POWER9
> they are positive. This patch adds helper routines to differentiate
> the sign to read the correct pstate value.

This sounds like it could be a bad bug, but I can't really tell from the
change log. What is the actual impact of not having this patch?

Should it have a Fixes/Cc-stable tag?

cheers