[PATCH tip/core/rcu 15/17] rcutorture: Recover from OOM during forward-progress tests

This commit causes the OOM handler to do rcu_barrier() calls and to free up forward-progress callbacks in order to recover from OOM events. The current test is terminated, but subsequent forward-progress tests can proceed. This allows a long test to result in multiple forward-progress failures,

[PATCH tip/core/rcu 15/17] rcutorture: Recover from OOM during forward-progress tests

This commit causes the OOM handler to do rcu_barrier() calls and to free up forward-progress callbacks in order to recover from OOM events. The current test is terminated, but subsequent forward-progress tests can proceed. This allows a long test to result in multiple forward-progress failures,