[PATCH 1/2] xen/events: Fix xen_set_upcall_vector stub

Building the xen_set_upcall_vector stub fails with
error: control reaches end of non-void function.

Return -EINVAL, which matches the hypercall's return for a non-HVM
domain.

This is needed to allow disabling CONFIG_XEN_PVHVM.

Fixes: b1c3497e604d ("x86/xen: Add support for HVMOP_set_evtchn_upcall_vector")
Signed-off-by: Jason Andryuk <[email protected]>
---
 drivers/xen/events/events_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 6ea945508a89..3a5ae96e73cc 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -2245,7 +2245,7 @@ static __init void xen_alloc_callback_vector(void)
 #else
 void xen_setup_callback_vector(void) {}
 static inline void xen_init_setup_upcall_vector(void) {}
-int xen_set_upcall_vector(unsigned int cpu) {}
+int xen_set_upcall_vector(unsigned int cpu) { return -EINVAL; }
 static inline void xen_alloc_callback_vector(void) {}
 #endif /* CONFIG_XEN_PVHVM */
 #endif /* CONFIG_X86 */
-- 
2.55.0