From: Will Deacon <will.deacon@arm.com>
Date: Thu, 17 Nov 2011 15:05:14 +0000 (+0000)
Subject: ARM: perf: initialise used_mask for fake PMU during validation
X-Git-Tag: v3.2-rc4~2^2~11^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bce34d14428d35d9a06ddc10cd46ecef311764c9;p=pandora-kernel.git

ARM: perf: initialise used_mask for fake PMU during validation

When validating an event group, we call pmu->get_event_idx for each
group member in order to check that the group can be scheduled as a
unit on an empty PMU.

As a result of 3fc2c830 ("ARM: perf: remove event limit from
pmu_hw_events"), the used_mask member of struct cpu_hw_events must be
setup explicitly, something which we don't do for the fake cpu_hw_events
used for validation.

This patch sets up an empty used_mask for the fake validation
cpu_hw_events, preventing NULL deferences when trying to get the event
index.

Reported-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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