We inadvertently create a dependency on mmap_sem with a whole chain.
This breaks any user who wants to take a lock and call rcu_barrier(),
while also taking that lock inside mmap_sem:
<4> [604.892532] ==
<4> [604.892534] WARNING: possible circul
We inadvertently create a dependency on mmap_sem with a whole chain.
This breaks any user who wants to take a lock and call rcu_barrier(),
while also taking that lock inside mmap_sem:
<4> [604.892532] ==
<4> [604.892534] WARNING: possible circul
Tvrtko Ursulin writes:
> From: Tvrtko Ursulin
>
> 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
> Cc: Alexander Shishkin
> Cc: Ingo Molnar
> Cc:
Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact:
shuang...@intel.com)
Task id: 6523
-Summary-
Platform Delta drm-intel-nightly Series Applied
PNV
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
Since this drivers creates attributes on the heap, lockdep
gets upset and disable
From: Tvrtko Ursulin
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
Cc: Alexander Shishkin
Cc: Ingo Molnar
Cc: Peter Zijlstra (Intel)
Cc: x...@kernel.org
Wrong patch escaped.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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---
drivers/gpu/drm/i915/i915_perf.c | 10 ++
1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 7345b507a9dc..3741f69bc36f 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -46,6 +4
