From: Ingo Molnar <mingo@kernel.org>
Date: Mon, 7 May 2012 17:19:56 +0000 (+0200)
Subject: x86/apic: Fix UP boot crash
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9438ef7f4ea73d5430a330fc206f97826eb9fb16;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

x86/apic: Fix UP boot crash

Commit 31b3c9d72340 ("xen/x86: Implement x86_apic_ops") implemented
this:

... without considering that on UP the function pointer might be NULL.

Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/n/tip-3pfty0ml4yp62phbkchichh0@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 8526317c5f0b..7e67c5a71061 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1012,7 +1012,8 @@ void __init setup_arch(char **cmdline_p)
 	init_cpu_to_node();
 
 	init_apic_mappings();
-	x86_io_apic_ops.init();
+	if (x86_io_apic_ops.init)
+		x86_io_apic_ops.init();
 
 	kvm_guest_init();