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

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Date:	Mon,  2 Feb 2015 17:30:01 +0100
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	David Rientjes <rientjes@...gle.com>,
	Oren Twaig <oren@...lemp.com>, Jan Beulich <JBeulich@...e.com>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Christoph Lameter <cl@...ux.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	linux-kernel@...r.kernel.org,
	David Vrabel <david.vrabel@...rix.com>,
	Rob Herring <robh@...nel.org>
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v2] x86/devicetree: Fix build for amd64

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@...il.com>
---

v2: Suggested by: Jiang Liu <jiang.liu@...ux.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

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