x86, xenoprof: Add Nehalem to list of ppro cores

Straight port from Linus's tree:

commit 4b9f12a3779c548b68bc9af7d94030868ad3aa1b
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu Jul 24 17:29:00 2008 -0700

    x86/oprofile/nmi_int: add Nehalem to list of ppro cores

    ..otherwise oprofile will fall back on that poor timer interrupt.

    Also replace the unreadable chain of if-statements with a
    "switch()"
    statement instead. It generates better code, and is a lot clearer.

    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Markus Armbruster <armbru@redhat.com>

xen/arch/x86/oprofile/nmi_int.c

@@ -296,24 +296,40 @@ static int __init ppro_init(char ** cpu_type)
 {
 	__u8 cpu_model = current_cpu_data.x86_model;
 
-	if (cpu_model == 15 || cpu_model == 23) {
+	switch (cpu_model) {
+	case 0 ... 2:
+		*cpu_type = "i386/ppro";
+		break;
+	case 3 ... 5:
+		*cpu_type = "i386/pii";
+		break;
+	case 6 ... 8:
+		*cpu_type = "i386/piii";
+		break;
+	case 9:
+		*cpu_type = "i386/p6_mobile";
+		break;
+	case 10 ... 13:
+		*cpu_type = "i386/p6";
+		break;
+	case 14:
+		*cpu_type = "i386/core";
+		break;
+	case 15: case 23:
 		*cpu_type = "i386/core_2";
 		ppro_has_global_ctrl = 1;
-	} else if (cpu_model == 14)
-		*cpu_type = "i386/core";
-	else if (cpu_model > 13) {
+		break;
+	case 26:
+		*cpu_type = "i386/core_2";
+		ppro_has_global_ctrl = 1;
+		break;
+	default:
+		/* Unknown */
 		printk("xenoprof: Initialization failed. "
 		       "Intel processor model %d for P6 class family is not "
 		       "supported\n", cpu_model);
 		return 0;
-	} else if (cpu_model == 9)
-		*cpu_type = "i386/p6_mobile";
-	else if (cpu_model > 5)
-		*cpu_type = "i386/piii";
-	else if (cpu_model > 2)
-		*cpu_type = "i386/pii";
-	else
-		*cpu_type = "i386/ppro";
+	}
 
 	model = &op_ppro_spec;
 	return 1;