Le Wed, Nov 05, 2025 at 12:32:14PM -0800, Paul E. McKenney a écrit : > This commit creates an SRCU-fast-updown API, including > DEFINE_SRCU_FAST_UPDOWN(), DEFINE_STATIC_SRCU_FAST_UPDOWN(), > __init_srcu_struct_fast_updown(), init_srcu_struct_fast_updown(), > srcu_read_lock_fast_updown(), srcu_read_unlock_fast_updown(), > __srcu_read_lock_fast_updown(), and __srcu_read_unlock_fast_updown(). > > These are initially identical to their SRCU-fast counterparts, but both > SRCU-fast and SRCU-fast-updown will be optimized in different directions > by later commits. SRCU-fast will lack any sort of srcu_down_read() and > srcu_up_read() APIs, which will enable extremely efficient NMI safety. > For its part, SRCU-fast-updown will not be NMI safe, which will enable > reasonably efficient implementations of srcu_down_read_fast() and > srcu_up_read_fast().
Doing a last round of reviews before sitting down on a pull request, I think the changelog in this one should mention what are the expected uses of SRCU-fast-updown, since the RCU-TASK-TRACE conversion bits aren't there for this merge window yet. Thanks. -- Frederic Weisbecker SUSE Labs
