[PATCH] make bigsmp the default mode if CONFIG_HOTPLUG_CPU

If we are using hotplug enabled kernel, then make bigsmp the default mode.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/i386/kernel/mpparse.c b/arch/i386/kernel/mpparse.c
index 1ca5269b1e863c8d9b7d9792e1b796a6cb7d8b4e..91a64016956e0d4fdbfc2698e0dd3925def58fe7 100644 (file)
--- a/arch/i386/kernel/mpparse.c
+++ b/arch/i386/kernel/mpparse.c
@@ -38,6 +38,12 @@
 int smp_found_config;
 unsigned int __initdata maxcpus = NR_CPUS;
 
+#ifdef CONFIG_HOTPLUG_CPU
+#define CPU_HOTPLUG_ENABLED    (1)
+#else
+#define CPU_HOTPLUG_ENABLED    (0)
+#endif
+
 /*
  * Various Linux-internal data structures created from the
  * MP-table.
@@ -219,14 +225,18 @@ static void __devinit MP_processor_info (struct mpc_config_processor *m)
        cpu_set(num_processors, cpu_possible_map);
        num_processors++;
 
-       if ((num_processors > 8) &&
-           ((APIC_XAPIC(ver) &&
-            (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)) ||
-            (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)))
-               def_to_bigsmp = 1;
-       else
-               def_to_bigsmp = 0;
-
+       if (CPU_HOTPLUG_ENABLED || (num_processors > 8)) {
+               switch (boot_cpu_data.x86_vendor) {
+               case X86_VENDOR_INTEL:
+                       if (!APIC_XAPIC(ver)) {
+                               def_to_bigsmp = 0;
+                               break;
+                       }
+                       /* If P4 and above fall through */
+               case X86_VENDOR_AMD:
+                       def_to_bigsmp = 1;
+               }
+       }
        bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
 }