xen/asm-generic: introduce generic hypercall.h

Introduce an empty generic hypercall.h for archs which don't
implement it.

Drop PPC's hypercall.h and switch to generic one instead.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Shawn Anastasio <sanastasio@raptorengineering.com>

xen/arch/ppc/include/asm/Makefile

@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
+generic-y += hypercall.h
 generic-y += paging.h
 generic-y += vm_event.h

xen/arch/ppc/include/asm/hypercall.h

@@ -1,5 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-#ifndef __ASM_PPC_HYPERCALL_H__
-#define __ASM_PPC_HYPERCALL_H__
-
-#endif /* __ASM_PPC_HYPERCALL_H__ */

xen/include/asm-generic/hypercall.h

@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __XEN_HYPERCALL_H__
+#error "asm/hypercall.h should not be included directly - include xen/hypercall.h instead"
+#endif
+
+#ifndef __ASM_GENERIC_HYPERCALL_H__
+#define __ASM_GENERIC_HYPERCALL_H__
+
+#endif /* __ASM_GENERIC_HYPERCALL_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */