x86/cpu: Move prototype for get_umwait_control_msr() to a global location

.. in order to fix a -Wmissing-prototypes warning.

No functional change.
Signed-off-by: Benjamin Thiel <b.thiel@posteo.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: kvm@vger.kernel.org
Link: https://lkml.kernel.org/r/20200123172945.7235-1-b.thiel@posteo.de

arch/x86/include/asm/mwait.h

@@ -23,6 +23,8 @@
 #define MWAITX_MAX_LOOPS		((u32)-1)
 #define MWAITX_DISABLE_CSTATES		0xf0
 
+u32 get_umwait_control_msr(void);
+
 static inline void __monitor(const void *eax, unsigned long ecx,
 			     unsigned long edx)
 {

arch/x86/kernel/cpu/umwait.c

@@ -4,6 +4,7 @@
 #include <linux/cpu.h>
 
 #include <asm/msr.h>
+#include <asm/mwait.h>
 
 #define UMWAIT_C02_ENABLE	0
 

arch/x86/kvm/vmx/vmx.c

@@ -41,6 +41,7 @@
 #include <asm/mce.h>
 #include <asm/mmu_context.h>
 #include <asm/mshyperv.h>
+#include <asm/mwait.h>
 #include <asm/spec-ctrl.h>
 #include <asm/virtext.h>
 #include <asm/vmx.h>

arch/x86/kvm/vmx/vmx.h

@@ -14,8 +14,6 @@
 extern const u32 vmx_msr_index[];
 extern u64 host_efer;
 
-extern u32 get_umwait_control_msr(void);
-
 #define MSR_TYPE_R	1
 #define MSR_TYPE_W	2
 #define MSR_TYPE_RW	3