[PATCH] x86/xen: Fix compilation error due to missing nopvspin declaration

[Leon Romanovsky <leon@kernel.org>]

From: Leon Romanovsky <leonro@nvidia.com>

 arch/x86/xen/smp_hvm.c: In function 'xen_hvm_smp_init':
 arch/x86/xen/smp_hvm.c:77:3: error: 'nopvspin' undeclared (first use in this function)
    nopvspin = true;
    ^~~~~~~~
 arch/x86/xen/smp_hvm.c:77:3: note: each undeclared identifier is reported only once for each function it appears in
 make[4]: *** [scripts/Makefile.build:279: arch/x86/xen/smp_hvm.o] Error 1
 make[3]: *** [scripts/Makefile.build:496: arch/x86/xen] Error 2
 make[3]: *** Waiting for unfinished jobs....
 make[2]: *** [Makefile:1805: arch/x86] Error 2
 make[2]: *** Waiting for unfinished jobs....

Fixes: 3d7746bea925 ("x86/xen: Fix xen_hvm_smp_init() when vector callback not available")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 arch/x86/xen/smp_hvm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/xen/smp_hvm.c b/arch/x86/xen/smp_hvm.c
index 056430a1080b..1656713db71c 100644
--- a/arch/x86/xen/smp_hvm.c
+++ b/arch/x86/xen/smp_hvm.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/thread_info.h>
 #include <asm/smp.h>
+#include <asm/qspinlock.h>

 #include <xen/events.h>

--
2.29.2