linux-kernel - [PATCH 0/2] fs/epoll: restore user-visible behavior upon event ready

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Message-Id: <20210405231025.33829-1-dave@stgolabs.net>
Date:   Mon,  5 Apr 2021 16:10:23 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     akpm@...ux-foundation.org
Cc:     jbaron@...mai.com, rpenyaev@...e.de, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        dave@...olabs.net
Subject: [PATCH 0/2] fs/epoll: restore user-visible behavior upon event ready

Hi,

This series tries to address a change in user visible behavior,
reported in:

 https://bugzilla.kernel.org/show_bug.cgi?id=208943

Epoll does not report an event to all the threads running epoll_wait()
on the same epoll descriptor. Unsurprisingly, this was bisected back to
339ddb53d373 (fs/epoll: remove unnecessary wakeups of nested epoll), which
has had various problems in the past, beyond only nested epoll usage.

Thanks!

Davidlohr Bueso (2):
  kselftest: introduce new epoll test case
  fs/epoll: restore waking from ep_done_scan()

 fs/eventpoll.c                                |  6 +++
 .../filesystems/epoll/epoll_wakeup_test.c     | 44 +++++++++++++++++++
 2 files changed, 50 insertions(+)

--
2.26.2