[PATCH] Fix x86_64 build with CONFIG_HOTPLUG_CPU=n

[Roland Dreier <rdreier@cisco.com>]

In arch/x86_64, kernel/setup.c calls setup_additional_cpus() if
CONFIG_SMP is defined.  However, kernel/smpboot.c only defines it if
CONFIG_HOTPLUG_CPU is defined, so a build with SMP but not HOTPLUG_CPU
will fail.  Fix this by testing HOTPLUG_CPU in kernel/setup.c as well.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -424,7 +424,7 @@ static __init void parse_cmdline_early (
 			elfcorehdr_addr = memparse(from+11, &from);
 #endif
 
-#ifdef CONFIG_SMP
+#ifdef CONFIG_HOTPLUG_CPU
 		else if (!memcmp(from, "additional_cpus=", 16))
 			setup_additional_cpus(from+16);
 #endif
-
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