Re: [PATCH RFC 6/4] srcu: Add guards for SRCU-fast readers

[Steven Rostedt <rostedt@goodmis.org>]

On Thu, 17 Jul 2025 12:04:46 -0700
"Paul E. McKenney" <paulmck@kernel.org> wrote:

> This adds the usual scoped_guard(srcu_fast, &my_srcu) and
> guard(srcu_fast)(&my_srcu).
> 
> Suggested-by: Steven Rostedt <rostedt@goodmis.org>
> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>

-- Steve

> ---
>  srcu.h |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/linux/srcu.h b/include/linux/srcu.h
> index 0aa2376cca0b1..ada65b58bc4c5 100644
> --- a/include/linux/srcu.h
> +++ b/include/linux/srcu.h
> @@ -510,6 +510,11 @@ DEFINE_LOCK_GUARD_1(srcu, struct srcu_struct,
>  		    srcu_read_unlock(_T->lock, _T->idx),
>  		    int idx)
>  
> +DEFINE_LOCK_GUARD_1(srcu_fast, struct srcu_struct,
> +		    _T->scp = srcu_read_lock_fast(_T->lock),
> +		    srcu_read_unlock_fast(_T->lock, _T->scp),
> +		    struct srcu_ctr __percpu *scp)
> +
>  DEFINE_LOCK_GUARD_1(srcu_fast_notrace, struct srcu_struct,
>  		    _T->scp = srcu_read_lock_fast_notrace(_T->lock),
>  		    srcu_read_unlock_fast_notrace(_T->lock, _T->scp),