locking-core-2020-08-03

 - LKMM updates: mostly documentation changes, but also some new litmus tests for atomic ops.

 - KCSAN updates: the most important change is that GCC 11 now has all fixes in place
                  to support KCSAN, so GCC support can be enabled again. Also more annotations.

 - futex updates: minor cleanups and simplifications

 - seqlock updates: merge preparatory changes/cleanups for the 'associated locks' facilities.

 - lockdep updates:
    - simplify IRQ trace event handling
    - add various new debug checks
    - simplify header dependencies, split out <linux/lockdep_types.h>, decouple
      lockdep from other low level headers some more
    - fix NMI handling

 - misc cleanups and smaller fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>