From: Ashok Raj <ashok.raj@intel.com>
Date: Fri, 6 Jan 2006 08:12:09 +0000 (-0800)
Subject: [PATCH] make bigsmp the default mode if CONFIG_HOTPLUG_CPU
X-Git-Tag: v2.6.16-rc1~936^2~188
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=e72c8585e09f127a69a1608bb5ccd1e3fc0dd41e;p=~emulex%2Finfiniband.git

[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 1ca5269b1e8..91a64016956 100644
--- 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;
 }