linux-kernel - [ 34/48] oprofile: perf: use NR_CPUS instead or nr_cpumask

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Message-Id: <20120701172011.511054573@decadent.org.uk>
Date:	Sun, 01 Jul 2012 18:20:40 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Will Deacon <will.deacon@....com>,
	Matt Fleming <matt@...sole-pimps.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Robert Richter <robert.richter@....com>
Subject: [ 34/48] oprofile: perf: use NR_CPUS instead or nr_cpumask_bits for static
 array

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Will Deacon <will.deacon@....com>

commit e734568b675c985db2026848fefaac01c22977a5 upstream.

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>
Reported-by: Russell King - ARM Linux <linux@....linux.org.uk>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Robert Richter <robert.richter@....com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/oprofile/oprofile_perf.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;
 
 /*


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