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selftests/epoll: add a regression test for pipe->poll_usage

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pipe->poll_usage was added to ensure that edge-triggered epoll consumers
get a wakeup on every write, even if the pipe was already non-empty.
However, none of the existing epoll_wakeup_test cases cover this; the
test suite passes even with WRITE_ONCE(pipe->poll_usage, true) removed.

Add a test that writes twice to a pipe and verifies that epoll_wait with
EPOLLET reports data each time. This covers the pipe-specific per-write
wakeup behavior that edge-triggered consumers depend on.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://patch.msgid.link/amnlGZesXu-SUK2H@redhat.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Oleg Nesterov 2026-07-29 13:33:45 +02:00 committed by Christian Brauner
parent f1cebdec97
commit ab018b7733
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1 changed files with 23 additions and 0 deletions
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23
tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c
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@ -3538,4 +3538,27 @@ TEST(epoll65)
close(ctx.efd[1]);
}
TEST(epoll66)
{
struct epoll_event event;
int pfd[2], efd;
ASSERT_EQ(pipe(pfd), 0);
efd = epoll_create1(0);
ASSERT_GE(efd, 0);
event.events = EPOLLIN | EPOLLET;
ASSERT_EQ(epoll_ctl(efd, EPOLL_CTL_ADD, pfd[0], &event), 0);
for (int i = 0; i < 2; ++i) {
ASSERT_EQ(write(pfd[1], "", 1), 1);
EXPECT_EQ(epoll_wait(efd, &event, 1, 0), 1);
}
close(pfd[0]);
close(pfd[1]);
close(efd);
}
TEST_HARNESS_MAIN