commit 0e2af2a9abf94b408ff70679b692a8644fed4aab fixed this warning, it
again introduced by commit 5f2b0ba4d94b3ac23cbc4b7f675d98eb677a760a.
This patch fixes it by moving arch_trigger_all_cpu_backtrace few lines
above backtrace_mask's declaration.

We were warned by the following warning:

arch/x86/kernel/apic/hw_nmi.c:29: warning: ‘backtrace_mask’ defined but not used


Signed-off-by: Rakib Mullick <rakib.mullick@gmail.com>
---

diff --git a/arch/x86/kernel/apic/hw_nmi.c b/arch/x86/kernel/apic/hw_nmi.c
index a0e71cb..0c294b3 100644
--- a/arch/x86/kernel/apic/hw_nmi.c
+++ b/arch/x86/kernel/apic/hw_nmi.c
@@ -25,10 +25,11 @@ u64 hw_nmi_get_sample_period(void)
 #endif


+#ifdef arch_trigger_all_cpu_backtrace
+
 /* For reliability, we're prepared to waste bits here. */
 static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;

-#ifdef arch_trigger_all_cpu_backtrace
 void arch_trigger_all_cpu_backtrace(void)
 {
 	int i;
--
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