After introduction of lock_evaluate_nospec() using bool type, building
Xen on Arm with UBSAN enabled fails:

In file included from ./include/xen/spinlock.h:4,
                 from common/ubsan/ubsan.c:13:
./include/xen/nospec.h:79:22: error: unknown type name ‘bool’
   79 | static always_inline bool lock_evaluate_nospec(bool condition)

There is no issue on x86, as xen/stdbool.h is included somewhere along
the asm/nospec.h path, which is not the case for other architectures.

Fixes: 7ef0084418e1 ("x86/spinlock: introduce support for blocking speculation 
into critical regions")
Signed-off-by: Michal Orzel <michal.or...@amd.com>
---
 xen/include/xen/nospec.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/include/xen/nospec.h b/xen/include/xen/nospec.h
index e8d73f9538e5..9fb15aa26aa9 100644
--- a/xen/include/xen/nospec.h
+++ b/xen/include/xen/nospec.h
@@ -7,6 +7,8 @@
 #ifndef XEN_NOSPEC_H
 #define XEN_NOSPEC_H
 
+#include <xen/stdbool.h>
+
 #include <asm/nospec.h>
 
 /**
-- 
2.25.1


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