oprofile: introduce module_param oprofile.cpu_type

This patch removes module_param oprofile.force_arch_perfmon and
introduces oprofile.cpu_type=archperfmon instead. This new parameter
can be reused for other models and architectures.

Currently only archperfmon is supported.

Cc: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9b9566bf3301f1181e113748da154e96f09e8701..6ce5f48859cc54a2bcee75c89a261c48579e2d3d 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1650,11 +1650,13 @@ and is between 256 and 4096 characters. It is defined in the file
        oprofile.timer= [HW]
                        Use timer interrupt instead of performance counters
 
-       oprofile.force_arch_perfmon=1   [X86]
-                       Force use of architectural perfmon instead of
-                       the CPU specific event set.
-                       This might be useful if you have older oprofile
-                       userland or if you want common events over Intel CPUs.
+       oprofile.cpu_type=      Force an oprofile cpu type
+                       This might be useful if you have an older oprofile
+                       userland or if you want common events.
+                       Format: { archperfmon }
+                       archperfmon: [X86] Force use of architectural
+                               perfmon on Intel CPUs instead of the
+                               CPU specific event set.
 
        osst=           [HW,SCSI] SCSI Tape Driver
                        Format: <buffer_size>,<write_threshold>

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 3308147182aefaef491a8791f1ac6a8714cc86c4..3b285e656e27e57dbf4ae6dd35b715d7c9f2d1c7 100644 (file)
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -386,8 +386,17 @@ static int __init p4_init(char **cpu_type)
        return 0;
 }
 
-int force_arch_perfmon;
-module_param(force_arch_perfmon, int, 0);
+static int force_arch_perfmon;
+static int force_cpu_type(const char *str, struct kernel_param *kp)
+{
+       if (!strcmp(str, "archperfmon")) {
+               force_arch_perfmon = 1;
+               printk(KERN_INFO "oprofile: forcing architectural perfmon\n");
+       }
+
+       return 0;
+}
+module_param_call(cpu_type, force_cpu_type, NULL, NULL, 0);
 
 static int __init ppro_init(char **cpu_type)
 {