1 files changed, 14 insertions, 2 deletions

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index b28d2f1253bb..1ba67dc8006a 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -634,6 +634,18 @@ static int __init ppro_init(char **cpu_type)
         if (force_arch_perfmon && cpu_has_arch_perfmon)
                 return 0;
 
+        /*
+         * Documentation on identifying Intel processors by CPU family
+         * and model can be found in the Intel Software Developer's
+         * Manuals (SDM):
+         *
+         *  http://www.intel.com/products/processor/manuals/
+         *
+         * As of May 2010 the documentation for this was in the:
+         * "Intel 64 and IA-32 Architectures Software Developer's
+         * Manual Volume 3B: System Programming Guide", "Table B-1
+         * CPUID Signature Values of DisplayFamily_DisplayModel".
+         */
         switch (cpu_model) {
         case 0 ... 2:
                 *cpu_type = "i386/ppro";
@@ -655,12 +667,12 @@ static int __init ppro_init(char **cpu_type)
         case 15: case 23:
                 *cpu_type = "i386/core_2";
                 break;
+        case 0x1a:
         case 0x2e:
-        case 26:
                 spec = &op_arch_perfmon_spec;
                 *cpu_type = "i386/core_i7";
                 break;
-        case 28:
+        case 0x1c:
                 *cpu_type = "i386/atom";
                 break;
         default: