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authorAndi Kleen <andi@firstfloor.org>2009-04-27 17:44:11 +0200
committerRobert Richter <robert.richter@amd.com>2009-05-08 11:06:33 +0200
commit1dcdb5a9e7c235e6e80f1f4d5b8247b3e5347e48 (patch)
tree197b80f4941f535fd3b251755b74b557cb8d9ca8 /arch
parent54f2c841fa0007e5fee3b7d01a911c774f0a6cda (diff)
oprofile: re-add force_arch_perfmon option
This re-adds the force_arch_perfmon option that was in the original arch perfmon patchkit. Originally this was rejected in favour of a generalized perfmon=name option, but it turned out implementing the later in a reliable way is hard (and it would have been easy to crash the kernel if a user gets it wrong) But now Atom and Core i7 support being readded a user would need to update their oprofile userland to beyond 0.9.4 to use oprofile again on Atom or Core i7. To avoid this problem readd the force_arch_perfmon option. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/oprofile/nmi_int.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 202864ad49a..e5171c99e15 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -389,10 +389,16 @@ static int __init p4_init(char **cpu_type)
return 0;
}
+int force_arch_perfmon;
+module_param(force_arch_perfmon, int, 0);
+
static int __init ppro_init(char **cpu_type)
{
__u8 cpu_model = boot_cpu_data.x86_model;
+ if (force_arch_perfmon && cpu_has_arch_perfmon)
+ return 0;
+
switch (cpu_model) {
case 0 ... 2:
*cpu_type = "i386/ppro";