From: Will Deacon <will.deacon@arm.com>
Date: Wed, 27 Jul 2011 14:18:59 +0000 (+0100)
Subject: ARM: perf: use cpumask_t to record active IRQs
X-Git-Tag: v3.2-rc1~130^2~7^2^2~23
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b390e2126e03b6ec41f96fb0550b1526d00e203;p=pandora-kernel.git

ARM: perf: use cpumask_t to record active IRQs

Commit 5dfc54e0 ("ARM: GIC: avoid routing interrupts to offline CPUs")
prevents the GIC from setting the affinity of an IRQ to a CPU with
id >= nr_cpu_ids. This was previously abused by perf on some platforms
where more IRQs were registered than possible CPUs.

This patch fixes the problem by using a cpumask_t to keep track of the
active (requested) interrupts in perf. The same effect could be achieved
by limiting the number of IRQs to the number of CPUs, but using a mask
instead will be useful for adding extended CPU hotplug support in the
future.

Acked-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---

Reading git-diff-tree failed