srcu: expose srcu_readers_active()

This is needed by rust/helpers/srcu.c which now adds
rust_helper_srcu_readers_active() as a wrapper around the SRCU helper
for Rust callers.

To achive this:

1- Move the srcu_readers_active() implementation from
   "kernel/rcu/srcutree.c" to "include/linux/srcutree.h".

2- Implement a matching srcu_readers_active() in
   "include/linux/srcutiny.h" and use it on the existing open-coded
   WARN_ON() check in cleanup_srcu_struct().

Signed-off-by: Onur Özkan <work@onurozkan.dev>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Boqun Feng <boqun@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

0 files changed, 0 insertions, 0 deletions