Re: [PATCH v2] doc: Update recent RCU/SRCU API additions to whatisRCU.rst

[Paul E. McKenney]

On Mon, Oct 19, 2026 at 08:22:09PM +0800, Zqiang wrote:
> The following commit introduces some new RCU/SRCU APIs:
> 
> Commit 'd3f52f53a562 ("srcu: Create an SRCU-fast-updown API")'
> Commit 'dab06d6f9379 ("srcutree: Add an atomic Tree SRCU")'
> Commit 'cacadb630375 ("srcu: Add guards for notrace variants of SRCU-fast readers")'
> Commit 'fa8a2d55139f ("srcu: Add lock guard for srcu_fast_updown flavor")'
> Commit '954c0d741299 ("srcu: Add guards for SRCU-fast readers")'
> 
> This commit therefore update thems and some missing RCU related APIs
> to whatisRCU.rst.
> 
> Signed-off-by: Zqiang <qiang.zhang@xxxxxxxxx>

Thank you, for both patches:

Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxx>

> ---
>  Documentation/RCU/whatisRCU.rst | 24 +++++++++++++++++++++---
>  1 file changed, 21 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/RCU/whatisRCU.rst b/Documentation/RCU/whatisRCU.rst
> index e6767baff2d3..fe9dc3948690 100644
> --- a/Documentation/RCU/whatisRCU.rst
> +++ b/Documentation/RCU/whatisRCU.rst
> @@ -1084,8 +1084,9 @@ RCU::
>  	rcu_dereference			call_rcu
>  	rcu_dereference_check		call_rcu_hurry
>  	rcu_dereference_protected	kfree_rcu
> -	rcu_read_lock_held		kvfree_rcu
> -	rcu_read_lock_any_held		kfree_rcu_mightsleep
> +	rcu_dereference_all		kvfree_rcu
> +	rcu_read_lock_held		kfree_rcu_mightsleep
> +	rcu_read_lock_any_held		kvfree_rcu_mightsleep
>  	rcu_pointer_handoff		cond_synchronize_rcu
>  	unrcu_pointer			cond_synchronize_rcu_full
>  					cond_synchronize_rcu_expedited
> @@ -1209,13 +1210,23 @@ SRCU::
>  	srcu_read_lock_nmisafe		start_poll_synchronize_srcu
>  	srcu_read_unlock_nmisafe	start_poll_synchronize_srcu_expedited
>  	srcu_read_lock_notrace		poll_state_synchronize_srcu
> -	srcu_read_unlock_notrace
> +	srcu_read_unlock_notrace	synchronize_srcu_atomic
>  	srcu_down_read
>  	srcu_up_read
>  	srcu_down_read_fast
>  	srcu_up_read_fast
> +	srcu_read_lock_fast_updown
> +	srcu_read_unlock_fast_updown
> +	srcu_read_lock_atomic
> +	srcu_read_unlock_atomic
>  	guard(srcu)()
> +	guard(srcu_fast)()
> +	guard(srcu_fast_notrace)()
> +	guard(srcu_fast_updown)()
>  	scoped_guard(srcu)
> +	scoped_guard(srcu_fast)
> +	scoped_guard(srcu_fast_notrace)
> +	scoped_guard(srcu_fast_updown)
>  	srcu_read_lock_held
>  	srcu_dereference
>  	srcu_dereference_check
> @@ -1229,9 +1240,16 @@ SRCU: Initialization/cleanup/ordering::
>  	DEFINE_STATIC_SRCU
>  	DEFINE_SRCU_FAST        // for srcu_read_lock_fast() and friends
>  	DEFINE_STATIC_SRCU_FAST // for srcu_read_lock_fast() and friends
> +	DEFINE_SRCU_FAST_UPDOWN		// for srcu_read_lock_fast_updown() and friends
> +	DEFINE_STATIC_SRCU_FAST_UPDOWN	// for srcu_read_lock_fast_updown() and friends
> +	DEFINE_SRCU_ATOMIC		// for srcu_read_lock_atomic() and friends
> +	DEFINE_STATIC_SRCU_ATOMIC	// for srcu_read_lock_atomic() and friends
>  	init_srcu_struct
>  	init_srcu_struct_fast
> +	init_srcu_struct_fast_updown
> +	init_srcu_struct_atomic
>  	cleanup_srcu_struct
> +	smp_mb__after_srcu_read_lock
>  	smp_mb__after_srcu_read_unlock
>  
>  All: lockdep-checked RCU utility APIs::
> -- 
> 2.17.1
>