[PATCH] x86/irq: fix build warning in irq.c

[Yi Wang]

This fixes the following warnings:
arch/x86/kernel/irq.c:270:28: warning: no previous prototype for âsmp_x86_platform_ipiâ [-Wmissing-prototypes]
 __visible void __irq_entry smp_x86_platform_ipi(struct pt_regs *regs)
                            ^
arch/x86/kernel/irq.c:301:16: warning: no previous prototype for âsmp_kvm_posted_intr_ipiâ [-Wmissing-prototypes]
 __visible void smp_kvm_posted_intr_ipi(struct pt_regs *regs)
                ^
arch/x86/kernel/irq.c:314:16: warning: no previous prototype for âsmp_kvm_posted_intr_wakeup_ipiâ [-Wmissing-prototypes]
 __visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs)
                ^
arch/x86/kernel/irq.c:328:16: warning: no previous prototype for âsmp_kvm_posted_intr_nested_ipiâ [-Wmissing-prototypes]
 __visible void smp_kvm_posted_intr_nested_ipi(struct pt_regs *regs)
                ^

Signed-off-by: Yi Wang <wang.yi59@xxxxxxxxxx>
---
 arch/x86/include/asm/irq.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
index 2395bb7..4c9855a 100644
--- a/arch/x86/include/asm/irq.h
+++ b/arch/x86/include/asm/irq.h
@@ -30,6 +30,9 @@ static inline int irq_canonicalize(int irq)
 
 #ifdef CONFIG_HAVE_KVM
 extern void kvm_set_posted_intr_wakeup_handler(void (*handler)(void));
+extern __visible void smp_kvm_posted_intr_ipi(struct pt_regs *regs);
+extern __visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs);
+extern __visible void smp_kvm_posted_intr_nested_ipi(struct pt_regs *regs);
 #endif
 
 extern void (*x86_platform_ipi_callback)(void);
@@ -44,6 +47,8 @@ static inline int irq_canonicalize(int irq)
 #ifdef CONFIG_X86_LOCAL_APIC
 void arch_trigger_cpumask_backtrace(const struct cpumask *mask,
 				    bool exclude_self);
+
+extern __visible void smp_x86_platform_ipi(struct pt_regs *regs);
 #define arch_trigger_cpumask_backtrace arch_trigger_cpumask_backtrace
 #endif
 
-- 
1.8.3.1