eventpoll: split ep_clear_and_put() into drain helpers

ep_clear_and_put()'s two-pass walk is the main way an ep file close
tears down its state, and the ordering between the passes is
load-bearing (see previous commit's docblock). Give each pass its
own function so the ordering is enforced by the call sequence in
ep_clear_and_put() rather than by convention inside one body.

ep_drain_pollwaits() carries out Pass 1: walk the rbtree and
ep_unregister_pollwait() each epi. The function-level comment names
it as Pass 1 and spells out the synchronization contract with
ep_poll_callback().

ep_drain_tree() carries out Pass 2: walk the rbtree and ep_remove()
each epi, capturing rb_next() before each erase. The comment names
it as Pass 2 and documents the hand-off with a concurrent
eventpoll_release_file() (removal path C).

ep_clear_and_put() keeps the poll-on-ep wakeup, ep->mtx bracketing,
and ep_put() + conditional ep_free(), and its docblock shrinks to
the high-level summary; the per-pass detail moved into the helpers.

No functional change.

Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
Link: https://patch.msgid.link/20260424-work-epoll-rework-v1-11-249ed00a20f3@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions