[PATCH RT 3/5] x86/apic: get rid of "warning: acpi_ioapic_lock defined but not used"

Steven Rostedt
2016-10-30T16:48:17Z

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4.1.35-rt41-rc1 stable review patch.
If anyone has any objections, please let me know.

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

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

kbuild test robot reported this against the -RT tree:

| In file included from include/linux/mutex.h:30:0,
| from include/linux/notifier.h:13,
| from include/linux/memory_hotplug.h:6,
| from include/linux/mmzone.h:777,
| from include/linux/gfp.h:5,
| from include/linux/slab.h:14,
| from include/linux/resource_ext.h:19,
| from include/linux/acpi.h:26,
| from arch/x86/kernel/acpi/boot.c:27:
|>> arch/x86/kernel/acpi/boot.c:90:21: warning: 'acpi_ioapic_lock' defined but not used [-Wunused-variable]
| static DEFINE_MUTEX(acpi_ioapic_lock);
| ^
| include/linux/mutex_rt.h:27:15: note: in definition of macro 'DEFINE_MUTEX'
| struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
^~~~~~~~~
which is also true (as in non-used) for !RT but the compiler does not
emit a warning.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
arch/x86/kernel/acpi/boot.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 07bea80223f6..cb66b0ea2d68 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -87,7 +87,9 @@ static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
* ->ioapic_mutex
* ->ioapic_lock
*/
+#ifdef CONFIG_X86_IO_APIC
static DEFINE_MUTEX(acpi_ioapic_lock);
+#endif

/* --------------------------------------------------------------------------
Boot-time Configuration
--
2.9.3