linux-kernel - [PATCH] oprofile: perf: use NR_CPUS instead or nr_cpumask

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Date:	Fri,  8 Jun 2012 16:16:04 +0100
From:	Will Deacon <will.deacon@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Will Deacon <will.deacon@....com>,
	Matt Fleming <matt@...sole-pimps.org>,
	Robert Richter <robert.richter@....com>
Subject: [PATCH] oprofile: perf: use NR_CPUS instead or nr_cpumask_bits for static array

The OProfile perf backend uses a static array to keep track of the
perf events on the system. When compiling with CONFIG_CPUMASK_OFFSTACK=y
&& SMP, nr_cpumask_bits is not a compile-time constant and the build
will fail with:

oprofile_perf.c:28: error: variably modified 'perf_events' at file scope

This patch uses NR_CPUs instead of nr_cpumask_bits for the array
initialisation. If this causes space problems in the future, we can
always move to dynamic allocation for the events array.

Cc: Matt Fleming <matt@...sole-pimps.org>
Cc: Robert Richter <robert.richter@....com>
Reported-by: Russell King - ARM Linux <linux@....linux.org.uk>
Signed-off-by: Will Deacon <will.deacon@....com>
---
 drivers/oprofile/oprofile_perf.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/oprofile/oprofile_perf.c b/drivers/oprofile/oprofile_perf.c
index da14432..efc4b7f 100644
--- a/drivers/oprofile/oprofile_perf.c
+++ b/drivers/oprofile/oprofile_perf.c
@@ -25,7 +25,7 @@ static int oprofile_perf_enabled;
 static DEFINE_MUTEX(oprofile_perf_mutex);
 
 static struct op_counter_config *counter_config;
-static struct perf_event **perf_events[nr_cpumask_bits];
+static struct perf_event **perf_events[NR_CPUS];
 static int num_counters;
 
 /*
-- 
1.7.4.1

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