Oops, didn't mean to send this here since it is not graphics related.
But it does happen on SKL so maybe it will be useful for someone. Tvrtko On 06/02/2015 12:37 PM, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <[email protected]> Since this drivers creates attributes on the heap, lockdep gets upset and disabled itself. Fix by setting ignore_lockdep flags for problematic attributes. Signed-off-by: Tvrtko Ursulin <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Peter Zijlstra (Intel) <[email protected]> Cc: [email protected] Cc: Michał Winiarski <[email protected]> --- Not saying this is a right fix but lets say I am trying to force the issue. :) --- arch/x86/kernel/cpu/perf_event_intel_pt.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event_intel_pt.c b/arch/x86/kernel/cpu/perf_event_intel_pt.c index ffe666c..1cff27b 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_pt.c +++ b/arch/x86/kernel/cpu/perf_event_intel_pt.c @@ -153,9 +153,10 @@ static int __init pt_pmu_hw_init(void) sysfs_attr_init(&de_attrs->attr.attr); - de_attr->attr.attr.mode = S_IRUGO; - de_attr->attr.show = pt_cap_show; - de_attr->var = (void *)i; + de_attr->attr.attr.mode = S_IRUGO; + de_attr->attr.show = pt_cap_show; + de_attr->attr.attr.ignore_lockdep = 1; + de_attr->var = (void *)i; attrs[i] = &de_attr->attr.attr; }
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