From nobody Tue Nov 26 10:22:19 2024 Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 809CD204008 for ; Fri, 18 Oct 2024 17:18:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729271891; cv=none; b=abIKIscx0reiW/RRfqbHXN2v040iIzk9pUa3YjSCRrEvdc+8Gv6PmfvKa19g8d+j+baqMiC1MtjLzce2WijC/mDVxASYN6P0BhqFDsxJBPayiv4nxT/B6nVvRts3lp0TuKW4VUPD3iIMNIH949YRIT/fKQb1o8e6Gmzq2HymUAc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729271891; c=relaxed/simple; bh=dk+2Ao6eBpxXZJV7TRzBnZbcedhZSUClpihRKk8bXbI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=fJIB4NX2GTRgUaLUakQPrzh2dw2HGyAptQnkBVTCTXo1g27dTeDlmpfh38VJpnpiP79DjYDEo1Ke+oYJjGKE7BP2er6kltBrDEIbXBJZaBbnO9vcbYMi/5Kjc7ep/rBycyeeAvLgIOXv+WdfC4yJaQtTsFazqIQeyCOBj5EeZuY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--edliaw.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=KpSm8Rxr; arc=none smtp.client-ip=209.85.215.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--edliaw.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="KpSm8Rxr" Received: by mail-pg1-f201.google.com with SMTP id 41be03b00d2f7-7ea6efcd658so2069196a12.3 for ; Fri, 18 Oct 2024 10:18:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1729271889; x=1729876689; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=UFQHSO14/jAsIAlP6YyLD1M4ZuBPXyCrx6oOfYWGU30=; b=KpSm8RxrYr55Npp2bcvPnLS05eEC2nBVpbBPkdlZ/Rk16b/Iic2onQ0TlySUvtiNbu 88quujpBumZhGCAUJWV/bMhfzlNgmDV0iZUUPgpOsav1XJ8YP16MoC2+pXQs5nnZaIvP /VyOgGK2oweUgvrtD+B3WqcLFDuZekHaBL8IilJz7UZuosTXS+xOQrJGLpgaS1W6ciGX wkTU+Y8eRw5h+ZMg60D7bTtrSleAfP0UOfqlTGr4W4oqCXVkqHaTSLNfvQfEgNPSoYGd Z4/0J/N+oAP8d2McOo8oQPVDjtSiFdjYFQeM22KFVvWbPsGM7j7bHbCSaWDCEavksbNl 2v+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729271889; x=1729876689; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=UFQHSO14/jAsIAlP6YyLD1M4ZuBPXyCrx6oOfYWGU30=; b=fcwZ3nlw7jIfXkNHkVwei80wg3SfrGfAs5NHeCJVPoUjkQlPdM8+LlwXTzBJFC1w46 L7vUy5rrcyqQ4ltW40VahnmU5t20rxa40TN8mmoqSgvsVrIjRtv3M0jT577LpkIDNEAX BW9vb9oyVxlKz7nVihL6UqPqDFgdh57x1UMHns6s5dVsTmIJjVJLVT57lzN7nhyf6fzH EzoO6rS3n5Y7gcjJeFBbv5dW7msVMnFcGBvabzZSOH8lKZRR9zWRr04SfxkOGLIN34aZ vZ8+43MMwCAoOOYB7Kv+H2w4HdDeXldVNzA6C/ePVqwf8btIHXKj5G+3JqE4oNDqyDGU gZmQ== X-Gm-Message-State: AOJu0YxQjIv/cmufAwAiFnV/599B2Csln5eLX2toWuy0VZVqjZZDQxIM +PFV3ws0dtHHkYnqWSmQc9SLYR1zgffJCsIkhR5NqzqOeLRI7o2/vwQ6+RX5ldrwDuYwVeDsdzi NHA== X-Google-Smtp-Source: AGHT+IElgKqKmBxxYFR30EicUCVFsCvFx4Ofclcxsw9+z9zau8/mq1g11dMoqL/6qwWZQUMW1ChAG57xdLs= X-Received: from edliaw.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:305d]) (user=edliaw job=sendgmr) by 2002:a63:3858:0:b0:7e9:f93c:22b9 with SMTP id 41be03b00d2f7-7eacc895cf2mr3205a12.10.1729271888448; Fri, 18 Oct 2024 10:18:08 -0700 (PDT) Date: Fri, 18 Oct 2024 17:17:23 +0000 In-Reply-To: <20241018171734.2315053-1-edliaw@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241018171734.2315053-1-edliaw@google.com> X-Mailer: git-send-email 2.47.0.105.g07ac214952-goog Message-ID: <20241018171734.2315053-3-edliaw@google.com> Subject: [PATCH 2/3] Revert "selftests/mm: replace atomic_bool with pthread_barrier_t" From: Edward Liaw To: linux-kselftest@vger.kernel.org, Andrew Morton , Shuah Khan , Edward Liaw , Peter Xu Cc: linux-kernel@vger.kernel.org, kernel-team@android.com, linux-mm@kvack.org, Ryan Roberts Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This reverts commit e61ef21e27e8deed8c474e9f47f4aa7bc37e138c. uffd_poll_thread may be called by other tests that do not initialize the pthread_barrier, so this approach is not correct. This will revert to using atomic_bool instead. Fixes: e61ef21e27e8 ("selftests/mm: replace atomic_bool with pthread_barrie= r_t") CC: Ryan Roberts Signed-off-by: Edward Liaw --- tools/testing/selftests/mm/uffd-common.c | 5 ++--- tools/testing/selftests/mm/uffd-common.h | 3 ++- tools/testing/selftests/mm/uffd-unit-tests.c | 14 ++++++-------- 3 files changed, 10 insertions(+), 12 deletions(-) diff --git a/tools/testing/selftests/mm/uffd-common.c b/tools/testing/selft= ests/mm/uffd-common.c index 852e7281026e..717539eddf98 100644 --- a/tools/testing/selftests/mm/uffd-common.c +++ b/tools/testing/selftests/mm/uffd-common.c @@ -18,7 +18,7 @@ bool test_uffdio_wp =3D true; unsigned long long *count_verify; uffd_test_ops_t *uffd_test_ops; uffd_test_case_ops_t *uffd_test_case_ops; -pthread_barrier_t ready_for_fork; +atomic_bool ready_for_fork; =20 static int uffd_mem_fd_create(off_t mem_size, bool hugetlb) { @@ -519,8 +519,7 @@ void *uffd_poll_thread(void *arg) pollfd[1].fd =3D pipefd[cpu*2]; pollfd[1].events =3D POLLIN; =20 - /* Ready for parent thread to fork */ - pthread_barrier_wait(&ready_for_fork); + ready_for_fork =3D true; =20 for (;;) { ret =3D poll(pollfd, 2, -1); diff --git a/tools/testing/selftests/mm/uffd-common.h b/tools/testing/selft= ests/mm/uffd-common.h index 3e6228d8e0dc..a70ae10b5f62 100644 --- a/tools/testing/selftests/mm/uffd-common.h +++ b/tools/testing/selftests/mm/uffd-common.h @@ -33,6 +33,7 @@ #include #include #include +#include =20 #include "../kselftest.h" #include "vm_util.h" @@ -104,7 +105,7 @@ extern bool map_shared; extern bool test_uffdio_wp; extern unsigned long long *count_verify; extern volatile bool test_uffdio_copy_eexist; -extern pthread_barrier_t ready_for_fork; +extern atomic_bool ready_for_fork; =20 extern uffd_test_ops_t anon_uffd_test_ops; extern uffd_test_ops_t shmem_uffd_test_ops; diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/s= elftests/mm/uffd-unit-tests.c index 3db2296ac631..b3d21eed203d 100644 --- a/tools/testing/selftests/mm/uffd-unit-tests.c +++ b/tools/testing/selftests/mm/uffd-unit-tests.c @@ -774,7 +774,7 @@ static void uffd_sigbus_test_common(bool wp) char c; struct uffd_args args =3D { 0 }; =20 - pthread_barrier_init(&ready_for_fork, NULL, 2); + ready_for_fork =3D false; =20 fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK); =20 @@ -791,9 +791,8 @@ static void uffd_sigbus_test_common(bool wp) if (pthread_create(&uffd_mon, NULL, uffd_poll_thread, &args)) err("uffd_poll_thread create"); =20 - /* Wait for child thread to start before forking */ - pthread_barrier_wait(&ready_for_fork); - pthread_barrier_destroy(&ready_for_fork); + while (!ready_for_fork) + ; /* Wait for the poll_thread to start executing before forking */ =20 pid =3D fork(); if (pid < 0) @@ -834,7 +833,7 @@ static void uffd_events_test_common(bool wp) char c; struct uffd_args args =3D { 0 }; =20 - pthread_barrier_init(&ready_for_fork, NULL, 2); + ready_for_fork =3D false; =20 fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK); if (uffd_register(uffd, area_dst, nr_pages * page_size, @@ -845,9 +844,8 @@ static void uffd_events_test_common(bool wp) if (pthread_create(&uffd_mon, NULL, uffd_poll_thread, &args)) err("uffd_poll_thread create"); =20 - /* Wait for child thread to start before forking */ - pthread_barrier_wait(&ready_for_fork); - pthread_barrier_destroy(&ready_for_fork); + while (!ready_for_fork) + ; /* Wait for the poll_thread to start executing before forking */ =20 pid =3D fork(); if (pid < 0) --=20 2.47.0.105.g07ac214952-goog