The usage of cpu_relax() requires vdso/processor.h. Currently
this header is included transitively, but that transitive inclusion is
about to go away.

Explicitly include the header.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 include/vdso/helpers.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/vdso/helpers.h b/include/vdso/helpers.h
index 1a5ee9d9052c38553c0cdf413e0030286f884d53..a1c995af4696351e55cd870c7c4211b0984fe9ab 100644
--- a/include/vdso/helpers.h
+++ b/include/vdso/helpers.h
@@ -6,6 +6,7 @@
 
 #include <asm/barrier.h>
 #include <vdso/datapage.h>
+#include <vdso/processor.h>
 
 static __always_inline u32 vdso_read_begin(const struct vdso_clock *vc)
 {

-- 
2.51.0