From: Will Deacon <will.deacon@arm.com>
Date: Fri, 25 Mar 2011 12:13:34 +0000 (+0100)
Subject: ARM: 6834/1: perf: reset counters on all CPUs during initialisation
X-Git-Tag: v2.6.39-rc2~40^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=574b69cbb633037a9c305d2993aeb680f4a8badd;p=pandora-kernel.git

ARM: 6834/1: perf: reset counters on all CPUs during initialisation

ARMv7 dictates that the interrupt-enable and count-enable registers for
each PMU counter are UNKNOWN following core reset.

This patch adds a new (optional) function pointer to struct arm_pmu for
resetting the PMU state during init. The reset function is called on
each CPU via an arch_initcall in the generic ARM perf_event code and
allows the PMU backend to write sane values to any UNKNOWN registers.

Acked-by: Jean Pihet <j-pihet@ti.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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