From: Venkatesh Pallipadi <venki@google.com>
Date: Fri, 3 Feb 2012 21:22:25 +0000 (+0100)
Subject: PM / QoS: CPU C-state breakage with PM Qos change
X-Git-Tag: v3.3-rc3~21^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d020283dc694c9ec31b410f522252f7a8397e67d;p=pandora-kernel.git

PM / QoS: CPU C-state breakage with PM Qos change

Looks like change "PM QoS: Move and rename the implementation files"
merged during the 3.2 development cycle made PM QoS depend on
CONFIG_PM which depends on (PM_SLEEP || PM_RUNTIME).

That breaks CPU C-states with kernels not having these CONFIGs, causing CPUs
to spend time in Polling loop idle instead of going into deep C-states,
consuming way way more power. This is with either acpi idle or intel idle
enabled.

Either CONFIG_PM should be enabled with any pm_qos users or
the !CONFIG_PM pm_qos_request() should return sane defaults not to break
the existing users. Here's is the patch for the latter option.

[rjw: Modified the changelog slightly.]

Signed-off-by: Venkatesh Pallipadi <venki@google.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: stable@vger.kernel.org
---

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