Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Giovanni Gherdovich <ggherdovich@suse.cz>
To:     Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Borislav Petkov <bp@suse.de>, Len Brown <lenb@kernel.org>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>
Cc:     x86@kernel.org, linux-pm@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Giovanni Gherdovich <ggherdovich@suse.cz>
Subject: [PATCH 0/2] More frequency invariance fixes for x86
Date:   Tue, 28 Apr 2020 15:24:48 +0200
Message-Id: <20200428132450.24901-1-ggherdovich@suse.cz>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Patch 1/2 prevents a division by zero in case the product
"delta_MPERF * arch_max_freq_ratio" overflows u64, as suggested by Linus at [1].
This patch supersedes the version at [2], as it also disables frequency
invariance when that overflow happens.

Patch 2/2 implements the recommendation by Ricardo Neri to check for an all
zero MSR_TURBO_RATIO_LIMIT and disable freq invariance in that case too.

[1] https://lore.kernel.org/lkml/CAHk-=wiX+NT2yxtdPszH9U_S96MCNQA56GJFXY45mZc47yG5KQ@mail.gmail.com/
[2] https://lore.kernel.org/lkml/20200422144055.18171-1-ggherdovich@suse.cz/
[3] https://lore.kernel.org/lkml/20200424013222.GA26355@ranerica-svr.sc.intel.com/

Giovanni Gherdovich (2):
  x86, sched: Prevent divisions by zero in frequency invariant
    accounting
  x86, sched: Bail out of frequency invariance if turbo frequency is
    unknown

 arch/x86/kernel/smpboot.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

-- 
2.16.4