[PATCH] x86/xen: Fix a -Wmissing prototypes warning for xen_start_kernel()

[Benjamin Thiel]

Fix:

  arch/x86/xen/enlighten_pv.c:1212:34:
  warning: no previous prototype for âxen_start_kernelâ [-Wmissing-prototypes]
  asmlinkage __visible void __init xen_start_kernel(void)

Add a prototype for xen_start_kernel() in a separate xen-specific header.

Signed-off-by: Benjamin Thiel <b.thiel@xxxxxxxxx>
---
 arch/x86/include/asm/xen/setup.h | 7 +++++++
 arch/x86/xen/enlighten_pv.c      | 1 +
 2 files changed, 8 insertions(+)
 create mode 100644 arch/x86/include/asm/xen/setup.h

diff --git a/arch/x86/include/asm/xen/setup.h b/arch/x86/include/asm/xen/setup.h
new file mode 100644
index 000000000000..b7bd97f4b837
--- /dev/null
+++ b/arch/x86/include/asm/xen/setup.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_XEN_SETUP_H
+#define _ASM_X86_XEN_SETUP_H
+
+asmlinkage __visible void __init xen_start_kernel(void);
+
+#endif /*_ASM_X86_XEN_SETUP_H */
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 35321f4d49f1..dc0850f09c70 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -55,6 +55,7 @@
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/cpuid.h>
+#include <asm/xen/setup.h>
 #include <asm/fixmap.h>
 #include <asm/processor.h>
 #include <asm/proto.h>
-- 
2.20.1