[PATCH] hyperv: fix build if KEXEC not enabled

[Stephen Hemminger]

Fixes regression 4.3 mergw window in my config 
where hyperv is enable but CONFIG_KEXEC not enabled.

arch/x86/kernel/cpu/mshyperv.c:112: undefined reference to `native_machine_crash_shutdown'

Introduced by:
   commit b4370df2b1f5158de028e167974263c5757b34a6
   Author: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
   Date:   Sat Aug 1 16:08:09 2015 -0700

       Drivers: hv: vmbus: add special crash handler


Signed-off-by: Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx>


--- a/arch/x86/kernel/cpu/mshyperv.c	2015-09-07 10:11:24.994885115 -0700
+++ b/arch/x86/kernel/cpu/mshyperv.c	2015-09-07 10:14:20.995698615 -0700
@@ -109,7 +109,9 @@ static void hv_machine_crash_shutdown(st
 {
 	if (hv_crash_handler)
 		hv_crash_handler(regs);
+#ifdef CONFIG_KEXEC
 	native_machine_crash_shutdown(regs);
+#endif
 }
 
 
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