From: Peter Zijlstra
commit 734009e96d1983ad739e5b656e03430b3660c913 upstream.
Currently futex-pi relies on hb->lock to serialize everything. But hb->lock
creates another set of problems, especially priority inversions on RT where
hb->lock becomes a rt_mutex itself.
The rt_mutex::wait_lock is
From: Peter Zijlstra
commit 734009e96d1983ad739e5b656e03430b3660c913 upstream.
Currently futex-pi relies on hb->lock to serialize everything. But hb->lock
creates another set of problems, especially priority inversions on RT where
hb->lock becomes a rt_mutex itself.
The rt_mutex::wait_lock is
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