linux-kernel - [PATCH v1 0/2] cpuidle: Fixes in cpuidle driver

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Message-Id: <20170323152247.14733-1-svaidy@linux.vnet.ibm.com>
Date:   Thu, 23 Mar 2017 20:52:45 +0530
From:   Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:     Michael Neuling <mikey@...ling.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v1 0/2] cpuidle: Fixes in cpuidle driver

When CONFIG_HOTPLUG_CPU=n and cpu_present is less than cpu_possible,
then cpuidle-powernv not passing an explicit drv->cpu_mask allows
generic cpuidle driver to try create sysfs objects for cpus that does
not have cpu_devices created by calling register_cpu().

This caused kernel to access incorrect address and crash. The
following patch series fixes the cpuidle-powernv driver and also adds
additional checks in cpuidle_add_sysfs()

This patch set is against v4.11-rc3.

Changed from v1: Updated commit message and comments.

Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>