[PATCH v2] x86/devicetree: Fix build for amd64

[Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>]

apic_force_enable is not defined for amd64.

Without this patch:

LD      init/built-in.o
arch/x86/built-in.o: In function `dtb_lapic_setup':
kernel/devicetree.c:155:
undefined reference to `apic_force_enable'
Makefile:923: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
---

v2: Suggested by: Jiang Liu <jiang.liu@linux.intel.com>

How about defining a version of apic_force_enable()
for X86_64 in apic.h which just return failure?

 arch/x86/kernel/apic/apic.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 29b5b18..8d5a320 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1679,6 +1679,12 @@ static int __init detect_init_APIC(void)
 	mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
 	return 0;
 }
+
+int __init apic_force_enable(unsigned long addr)
+{
+	return -1;
+}
+
 #else
 
 static int __init apic_verify(void)
-- 
2.1.4