From patchwork Mon Sep 6 20:47:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella X-Patchwork-Id: 44874 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 3254B3885C12 for ; Mon, 6 Sep 2021 20:48:55 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3254B3885C12 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1630961335; bh=feeTUsAKsUafbAY2Y/NWZGzubjtkTvsbA0eMcUene0Y=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=x326F5Gb3t4a1BxusWZeGlZXTubRjHeZ9PxgOLl5QJ0cQhEyRHD+o25SLjqJxbGJb pzFnUldP3uCk7E/yGyDt8p364U9Qn7+Hxjx6fikQHTk6mppICYXZ2NL+7KNh4NEs2A mEY1VmKtt9fQqgqss41bvyOePYo8UUbRp07Vioc8= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qk1-x72f.google.com (mail-qk1-x72f.google.com [IPv6:2607:f8b0:4864:20::72f]) by sourceware.org (Postfix) with ESMTPS id 10879385B83D for ; Mon, 6 Sep 2021 20:47:50 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 10879385B83D Received: by mail-qk1-x72f.google.com with SMTP id t190so7966095qke.7 for ; Mon, 06 Sep 2021 13:47:50 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=feeTUsAKsUafbAY2Y/NWZGzubjtkTvsbA0eMcUene0Y=; b=em43sOhNtcgxxzmYqQQ5dJJ/S4UlVGakI/Uz8inZEfCOlNmNRgrbD4aQKo5e6L/JHJ 1nIMRmxWxY8dRfQ/JAUcm9WgzteT+MEQ211BDTX13EywfiqCW2jI14Ovt49olmdBMIgm 92BA/IMxwdWMJ9a2OA3zRIREr+qPN4NiugaOREwdFNT7KVYgV7udRK/8awbS3nLXq27j a/9xNxpt9lCvlJCb5VK2TVtlkQshumhGV0reu84uL4QHYoslQu6PRqKew9Wf8ZGoElWZ WITHbKoa1ZISmKfNzkS7UERyvUDTKJ8cQ1reFxHa8MbES8satqimbfF8zytGxaU9ne0W kzrQ== X-Gm-Message-State: AOAM532vx5nXuAAqxjrKBhjI9V87jHBQuCkl/bmdKKl9ZKKQjoxeRO6x 1grsp6/Mya4Cxv4K4qCUqwhngEa69cQftQ== X-Google-Smtp-Source: ABdhPJwb1qefIMBXmnQvLEZ5ag+Bm3dDYkU8BWj2DUO0GZUua1aRByUya4hXKqV65zJlqM7+bkHobg== X-Received: by 2002:a37:781:: with SMTP id 123mr13076525qkh.193.1630961269474; Mon, 06 Sep 2021 13:47:49 -0700 (PDT) Received: from birita.. ([2804:431:c7cb:733d:210:e147:8627:2d6]) by smtp.gmail.com with ESMTPSA id w129sm7468416qkb.61.2021.09.06.13.47.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Sep 2021 13:47:49 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH v3 1/4] Linux: Add FUTEX_LOCK_PI2 Date: Mon, 6 Sep 2021 17:47:37 -0300 Message-Id: <20210906204740.3988273-2-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210906204740.3988273-1-adhemerval.zanella@linaro.org> References: <20210906204740.3988273-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_NUMSUBJECT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Reply-To: Adhemerval Zanella Cc: Kurt Kanzenbach Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" From: Kurt Kanzenbach Linux v5.14.0 introduced a new futex operation called FUTEX_LOCK_PI2. This kernel feature can be used to implement pthread_mutex_clocklock(MONOTONIC)/PI. Signed-off-by: Kurt Kanzenbach Reviewed-by: Adhemerval Zanella --- sysdeps/unix/sysv/linux/kernel-features.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index 3930e14322..ffb6af196b 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -220,4 +220,12 @@ # define __ASSUME_FACCESSAT2 0 #endif +/* The FUTEX_LOCK_PI2 operation was introduced across all architectures in Linux + 5.14. */ +#if __LINUX_KERNEL_VERSION >= 0x050e00 +# define __ASSUME_FUTEX_LOCK_PI2 1 +#else +# define __ASSUME_FUTEX_LOCK_PI2 0 +#endif + #endif /* kernel-features.h */