From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5E28DFED3CC for ; Fri, 24 Apr 2026 14:28:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:Mime-Version:References:In-Reply-To:Message-Id:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1Ll/7QDQptcL0pa2z87xfVtB+Id23gnpjFd9LIew100=; b=VERlqZfNIN+waFNBCI3rmwyLtm MlpUDiIcd/kZyMJZmxJcqkBhdPcVSdykHsRK0amPTOR8S4ppEqNpSGzZWTD4C+EyFl0+vt8TvQB8K U5J2ftNaKVaCczXWnE1mptB/BT0ChiZJiqVylNO48keRis7Vy8pOfd8lIOzRnjfIFh5FZpv18LHSx CektQZJOdkYkfeI/J4vGjpP3rDgHXJdLQ1dlNUJ+DN6zjgoPaqOp3CZi7XrelW4ih9k8gBHWgfdWh DxCrDy7krv6fGD28rWmny0vuyMEuB89ZonOL25+p7x2xhF10+ujZcuK4MnTy18DpVhUKI67Lu8MAB QsqdLuJA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wGHWW-0000000DKXZ-0WFe; Fri, 24 Apr 2026 14:28:52 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wGHWV-0000000DKXT-2N24 for linux-arm-kernel@lists.infradead.org; Fri, 24 Apr 2026 14:28:51 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 8A4DD6001A; Fri, 24 Apr 2026 14:28:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C434C19425; Fri, 24 Apr 2026 14:28:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1777040927; bh=JOLAjUJZxkORvwjV4KMyJPPQMlPzeGI+Xzat5mLfNAY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=O/Y3cojLauCIDvWwjW8Rm82ldPv3YcF1tPNTv5blC/JP9MAXmk+S1E/ixk8QGUnSZ uNi6C8iJUYmCjyfO1nsdEVAGvuO8qVfAIFXa6DJd354zWaVct5od0w3QdENXrPAFNb ad9f0JF2uEcsiwTOBisrjCjaT8bU4mViiybAgp7U= Date: Fri, 24 Apr 2026 07:28:45 -0700 From: Andrew Morton To: Ankur Arora Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, bpf@vger.kernel.org, arnd@arndb.de, catalin.marinas@arm.com, will@kernel.org, peterz@infradead.org, mark.rutland@arm.com, harisokn@amazon.com, cl@gentwo.org, ast@kernel.org, rafael@kernel.org, daniel.lezcano@linaro.org, memxor@gmail.com, zhenglifeng1@huawei.com, xueshuai@linux.alibaba.com, rdunlap@infradead.org, david.laight.linux@gmail.com, joao.m.martins@oracle.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, ashok.bhat@arm.com Subject: Re: [PATCH v11 00/14] barrier: Add smp_cond_load_{relaxed,acquire}_timeout() Message-Id: <20260424072845.5eba94c2d732204f143b8629@linux-foundation.org> In-Reply-To: <20260408122538.3610871-1-ankur.a.arora@oracle.com> References: <20260408122538.3610871-1-ankur.a.arora@oracle.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 8 Apr 2026 17:55:24 +0530 Ankur Arora wrote: > The core kernel often uses smp_cond_load_{relaxed,acquire}() to spin > on condition variables with architectural primitives used to avoid > hammering the relevant cachelines. > > ... > > Accordingly add two interfaces (with their generic and arm64 specific > implementations): > > smp_cond_load_relaxed_timeout(ptr, cond_expr, time_expr, timeout) > smp_cond_load_acquire_timeout(ptr, cond_expr, time_expr, timeout) > > Also add tif_need_resched_relaxed_wait() which wraps the polling > pattern and its scheduler specific details in poll_idle(). > In addition add atomic_cond_read_*_timeout(), > atomic64_cond_read_*_timeout(), and atomic_long wrappers. AI review has been busy: https://sashiko.dev/#/patchset/20260408122538.3610871-1-ankur.a.arora@oracle.com