[Intel-gfx] [PATCH] perf/x86/intel/pt: Fix lockdep interaction

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

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 <tvrtko.ursulin at intel.com>
Cc: Alexander Shishkin <alexander.shishkin at linux.intel.com>
Cc: Ingo Molnar <mingo at kernel.org>
Cc: Peter Zijlstra (Intel) <peterz at infradead.org>
Cc: x86 at kernel.org
Cc: Michał Winiarski <michal.winiarski at intel.com>
---
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;
 	}
-- 
2.4.0