Re: [PATCH 3/7] checkpatch: Undeprecate rcu_read_lock_trace() and rcu_read_unlock_trace()

[Joe Perches]

On Thu, 2026-05-07 at 10:09 -0700, Paul E. McKenney wrote:
> It turns out that there are BPF use cases that rely on nesting RCU
> Tasks Trace readers.  These use cases are well-served by the old
> rcu_read_lock_trace() and rcu_read_unlock_trace() functions that maintain
> a nesting counter in the task_struct structure.  But these use cases incur
> a performance penalty when using the shiny new rcu_read_lock_tasks_trace()
> and rcu_read_unlock_tasks_trace() functions, which nest in the same way
> that SRCU does.
> 
> This means that rcu_read_lock_trace() and rcu_read_unlock_trace()
> will be with us for some time.  Therefore, remove the checkpatch.pl
> deprecation.

Fine by me.
Perhaps combining patches 3 and 4 would be more intelligible.