[tip:perfcounters/core] perf_counter, x86: Extend perf_counter Pentium M support

[tip-bot for Daniel Qarras]

Commit-ID:  f1c6a58121f9846ac665b0fbd3cbab90ce8bcbac
Gitweb:     http://git.kernel.org/tip/f1c6a58121f9846ac665b0fbd3cbab90ce8bcbac
Author:     Daniel Qarras <dqarras@xxxxxxxxx>
AuthorDate: Sun, 12 Jul 2009 04:32:40 -0700
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 13 Jul 2009 08:46:51 +0200

perf_counter, x86: Extend perf_counter Pentium M support

I've attached a patch to remove the Pentium M special casing of
EMON and as noticed at least with my Pentium M the hardware PMU
now works:

 Performance counter stats for '/bin/ls /var/tmp':

       1.809988  task-clock-msecs         #      0.125 CPUs
              1  context-switches         #      0.001 M/sec
              0  CPU-migrations           #	 0.000 M/sec
            224  page-faults              #	 0.124 M/sec
        1425648  cycles                   #    787.656 M/sec
         912755  instructions             #	 0.640 IPC

Vince suggested that this code was trying to address erratum
Y17 in Pentium-M's:

  http://download.intel.com/support/processors/mobile/pm/sb/25266532.pdf

But that erratum (related to IA32_MISC_ENABLES.7) does not
affect perfcounters as we dont use this toggle to disable RDPMC
and WRMSR/RDMSR access to performance counters. We keep cr4's
bit 8 (X86_CR4_PCE) clear so unprivileged RDPMC access is not
allowed anyway.

Cc: Vince Weaver <vince@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxxxxxx>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 arch/x86/kernel/cpu/perf_counter.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index bed1c4c..7e346d4 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -1583,10 +1583,8 @@ static int p6_pmu_init(void)
 		break;
 	case 9:
 	case 13:
-		/* for Pentium M, we need to check if PMU exist */
-		rdmsr(MSR_IA32_MISC_ENABLE, low, high);
-		if (low & MSR_IA32_MISC_ENABLE_EMON)
-			break;
+		/* Pentium M */
+		break;
 	default:
 		pr_cont("unsupported p6 CPU model %d ",
 			boot_cpu_data.x86_model);
--
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