Commit-ID: 42089697244ba8e64fa43fb5e6d50d47a8e4cb00 Gitweb: http://git.kernel.org/tip/42089697244ba8e64fa43fb5e6d50d47a8e4cb00 Author: Yan, Zheng <zheng.z.yan@xxxxxxxxx> AuthorDate: Wed, 4 Jul 2012 14:00:14 +0800 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Thu, 5 Jul 2012 21:56:00 +0200 perf/x86: Detect number of instances of uncore CBox The CBox manages the interface between the core and the LLC, so the instances of uncore CBox is equal to number of cores. Reported-by: Andrew Cooks <acooks@xxxxxxxxx> Signed-off-by: Yan, Zheng <zheng.z.yan@xxxxxxxxx> Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Link: http://lkml.kernel.org/r/1341381616-12229-4-git-send-email-zheng.z.yan@xxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/kernel/cpu/perf_event_intel_uncore.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c index 7d755d2..4fecbd0 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c @@ -1605,8 +1605,9 @@ static void __init uncore_cpu_setup(void *dummy) static int __init uncore_cpu_init(void) { - int ret, cpu; + int ret, cpu, max_cores; + max_cores = boot_cpu_data.x86_max_cores; switch (boot_cpu_data.x86_model) { case 26: /* Nehalem */ case 30: @@ -1615,9 +1616,13 @@ static int __init uncore_cpu_init(void) msr_uncores = nhm_msr_uncores; break; case 42: /* Sandy Bridge */ + if (snb_uncore_cbox.num_boxes > max_cores) + snb_uncore_cbox.num_boxes = max_cores; msr_uncores = snb_msr_uncores; break; case 45: /* Sandy Birdge-EP */ + if (snbep_uncore_cbox.num_boxes > max_cores) + snbep_uncore_cbox.num_boxes = max_cores; msr_uncores = snbep_msr_uncores; break; default: -- 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