From a0feb6db0fe03326d7d2c7a4615ce3289615c023 Mon Sep 17 00:00:00 2001
From: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Date: Tue, 6 Mar 2012 17:37:45 +0100
Subject: [PATCH] ARM: 7358/1: perf: add PMU hotplug notifier

When a CPU is taken out of reset, either cold booted or hotplugged in,
some of its PMU registers can contain UNKNOWN values.

This patch adds a hotplug notifier to ARM core perf code so that upon
CPU restart the PMU unit is reset and becomes ready to use again.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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