From patchwork Fri Jun 25 08:10:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kurt Kanzenbach X-Patchwork-Id: 44013 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 3411239BF4B7 for ; Fri, 25 Jun 2021 08:13:20 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3411239BF4B7 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1624608800; bh=IsSBBwuSqOJz1cynIplqPlmkPBatU/WX6rIycSCO7oI=; 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=Ko5rdfzQFElLWmp5OnjZkJtc3dvBibhgaGC/xBa9uFKIOu6OqSPCVkxCk5sxypVPp mivadM18BYKgJXVr++sgDTyo9UtONaAFN5cwPqa2Jl6tUacydtoT3La6yO8JmJVmfD g9AEn3kg0Ft7FEqD+kfLoYS/Xa2NglnftNm2yFaw= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by sourceware.org (Postfix) with ESMTPS id 9026F385702B for ; Fri, 25 Jun 2021 08:11:27 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 9026F385702B To: libc-alpha@sourceware.org Subject: [PATCH v1 1/6] Linux: Add FUTEX_LOCK_PI2 Date: Fri, 25 Jun 2021 10:10:59 +0200 Message-Id: <20210625081104.1134598-2-kurt@linutronix.de> In-Reply-To: <20210625081104.1134598-1-kurt@linutronix.de> References: <20210625081104.1134598-1-kurt@linutronix.de> MIME-Version: 1.0 X-Spam-Status: No, score=-10.2 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_NUMSUBJECT, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) 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: Kurt Kanzenbach via Libc-alpha From: Kurt Kanzenbach Reply-To: Kurt Kanzenbach Cc: Florian Weimer , Sebastian Andrzej Siewior , Kurt Kanzenbach , Peter Zijlstra , Thomas Gleixner , Joseph Myers Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" 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 1680b10ca1b6..af4b2b304715 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -218,4 +218,12 @@ # 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 */