From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1BB90381E95 for ; Wed, 29 Jul 2026 11:33:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785324837; cv=none; b=HD2JhhvYN14/1+WtokIEVqjhkNBkjrnOEbJC658DwbET5lBzOqL3+Lo0DwgmXZ2LH7AUYiRH+GDNsRsbGcejgN4Wjprg8Akf8GYx9UsoEp18asorW31y55fKdMd3WzSVRzalyXHe1Nm6q+hA+DH+IY94nPakstd2VBT9GKpzYC8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785324837; c=relaxed/simple; bh=NbAwnUdCuYwD7a3ygueu2+GMvWM/Ii2vr4VsLNVHfBk=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=OIdMY8IpfLZwgbs1d7QBXDLuzgAd4tdmjkN0k2FtuCe0zzJxMrXna0t4cnGN0UJScJ25B4EXirj536Hr/LTHzIbVzqMTCvsoD2xmWmUIKRvJF8WhSvogSxFfVkjdohd1wK+6kNO4+yx1UTSpUdXscPzkbxgq2ceiGFPCX3iVLXg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=SLyqxMRs; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SLyqxMRs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1785324835; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=8Pc/MvwmOme+dJKVAmWlyZtQIWAhQjn5KhDEVV84CyI=; b=SLyqxMRsUxQYNeED1VrmiEMlRgsd4e60RhQUMKk1dTf1gfRZrbEGb/lPC2Pa/W13u4LqXE UDsKMzr98UPsPyAN4uJFK+O3oYhziByI3Un8qrgzzb9oVTEM4JyLLYjSKwyj9BWixsH00/ PZCB/TcwAcyLyKgTCBsihSw2+9MiUNs= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-132-Hk6JSt_nNY-M5cFrvmNCQg-1; Wed, 29 Jul 2026 07:33:50 -0400 X-MC-Unique: Hk6JSt_nNY-M5cFrvmNCQg-1 X-Mimecast-MFC-AGG-ID: Hk6JSt_nNY-M5cFrvmNCQg_1785324829 Received: from mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.95]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 26E2419560A2; Wed, 29 Jul 2026 11:33:49 +0000 (UTC) Received: from fedora (unknown [10.44.33.21]) by mx-prod-int-10.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 02AF0414; Wed, 29 Jul 2026 11:33:46 +0000 (UTC) Received: by fedora (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Wed, 29 Jul 2026 13:33:48 +0200 (CEST) Date: Wed, 29 Jul 2026 13:33:45 +0200 From: Oleg Nesterov To: Christian Brauner , Nam Cao , Shuah Khan , Wei Yang Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] selftests/epoll: add a regression test for pipe->poll_usage Message-ID: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Scanned-By: MIMEDefang 3.6 on 10.30.177.95 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 --- .../filesystems/epoll/epoll_wakeup_test.c | 23 +++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c index f6f1a7ff01b0..81a994943e12 100644 --- a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c +++ b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c @@ -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 -- 2.52.0