From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Mon, 20 Dec 2010 14:28:02 +0000 (+0000)
Subject: ARM: localtimer: clean up local timer on hot unplug
X-Git-Tag: v2.6.38-rc1~471^2~2^2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10034aabca9032246762daaca3152f3e79380ea0;p=pandora-kernel.git

ARM: localtimer: clean up local timer on hot unplug

When a CPU is hot unplugged, the generic tick code cleans up the
clock event device, but fails to call down to the device's set_mode
function to actually shut the device down.

To work around this, we've historically had a local_timer_stop()
callback out of the hotplug code.  However, this adds needless
complexity when we have the clock event device itself available.

Explicitly call the clock event device's set_mode function with
CLOCK_EVT_MODE_UNUSED, so that the hardware can be cleanly shutdown
without any special external callbacks.  When/if the generic code
is fixed, percpu_timer_stop() can be killed off.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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