linux-kernel - [PATCH] sysctl: Fix 'defined but not used' warning

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Date:	Fri, 5 Oct 2012 12:57:48 -0300
From:	Fabio Estevam <fabio.estevam@...escale.com>
To:	<akpm@...ux-foundation.org>
CC:	<mingo@...nel.org>, <arnd@...db.de>,
	<linux-kernel@...r.kernel.org>, <a.p.zijlstra@...llo.nl>,
	<festevam@...il.com>, Fabio Estevam <fabio.estevam@...escale.com>
Subject: [PATCH] sysctl: Fix 'defined but not used' warning

Since commit 4ae834f767(sched/numa: Implement NUMA home-node selection code)
building a kernel with CONFIG_SMP disabled causes the following warning:

kernel/sysctl.c:259:12: warning: 'min_sched_tunable_scaling' defined but not used [-Wunused-variable]
kernel/sysctl.c:260:12: warning: 'max_sched_tunable_scaling' defined but not used [-Wunused-variable]

Annotate theses variables as '__maybe_unused'.

Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
---
 kernel/sysctl.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index af25d0c..4bf02e4 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -256,8 +256,8 @@ static int min_sched_granularity_ns = 100000;		/* 100 usecs */
 static int max_sched_granularity_ns = NSEC_PER_SEC;	/* 1 second */
 static int min_wakeup_granularity_ns;			/* 0 usecs */
 static int max_wakeup_granularity_ns = NSEC_PER_SEC;	/* 1 second */
-static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
-static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
+static int __maybe_unused min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
+static int __maybe_unused max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 #endif
 
 #ifdef CONFIG_COMPACTION
-- 
1.7.9.5


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