Commit-ID: dff5da6d09daaab40a8741dce0ed3c2e94079de2 Gitweb: http://git.kernel.org/tip/dff5da6d09daaab40a8741dce0ed3c2e94079de2 Author: Yong Wang <yong.y.wang@xxxxxxxxxxxxxxx> AuthorDate: Fri, 12 Jun 2009 16:08:55 +0800 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Fri, 12 Jun 2009 13:48:32 +0200 perf_counter/x86: Add a quirk for Atom processors The fixed-function performance counters do not work on current Atom processors. Use the general-purpose ones instead. Signed-off-by: Yong Wang <yong.y.wang@xxxxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Cc: Mike Galbraith <efault@xxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> LKML-Reference: <20090612080855.GA2286@xxxxxxxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- arch/x86/kernel/cpu/perf_counter.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c index 895c82e..275bc14 100644 --- a/arch/x86/kernel/cpu/perf_counter.c +++ b/arch/x86/kernel/cpu/perf_counter.c @@ -968,6 +968,13 @@ fixed_mode_idx(struct perf_counter *counter, struct hw_perf_counter *hwc) if (!x86_pmu.num_counters_fixed) return -1; + /* + * Quirk, IA32_FIXED_CTRs do not work on current Atom processors: + */ + if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && + boot_cpu_data.x86_model == 28) + return -1; + event = hwc->config & ARCH_PERFMON_EVENT_MASK; if (unlikely(event == x86_pmu.event_map(PERF_COUNT_HW_INSTRUCTIONS))) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html