From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794531488; b=W2VTUP1lvNFB8V/12SCpb7UP3LmrNe3T8vaE7AbZDuU/dDCMeehB86cV9ZrsdcuaLFKL m+IY5616okmxPj5UnHEqjN/8+gJsGJXSNP3Ib8VK4CJIRM4VEKS+4h+wWyxxXSqzAM9cj YCRdyHtUugtcQc7QbstM0x9RXrHuXER+EqiM4XcXVxQ1yREBe6FRiqOZHGiUWe6P9+4qh giab4rm/DHtno511oArcWmLMG7M6hZK38TG2bT2JglppBzfG7BPo3Gm/Az8JnYSYAHbRa jCKa5y1JGJRGodsQiVQz6w9lAr3baDR1PspKd/stLVMIPRULnDcVRv/1al3QF9h0b2Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794531488; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=9KrAdULCzzi+o1kFy+xOWC2+HcJXlxBlTraQzryexnE=; b=ZEs/RUFPHJic21MRiciwFAtfaxeaM3MAgJWvyYp9GTFJ3V5ZYVWjicNGQV1aErP81+cX dci9eo83sckNpX3eiTlwCWchT8kuqL00NOVcmRIIuOrjXjrIn1As+fHTG6TowNNtCEOT4 7yZus+blauHMS4LCJq/+l/K6Ql2BUTMWNR+OB0f4ni61HJ4Ahhgyt4nkTnnznP9UpNMYq hkb3xQYm6MZp37oAe9+TXtHD+RPC7oPQTyx25sgeoTG++F11SrOyI9xku0JfdAgTEu/mj zAB7M+wNBQ+GsKR1NZQj6orewtmHtuEkDO0le0Wc/wLj2fsN7k198VifxVCUUBw9Cpg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=L5VMZD1b; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with UTF8SMTPS id C8432606A890; Fri, 13 Nov 2026 00:58:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=L5VMZD1b Received: by smtp.kernel.org (Postfix) with UTF8SMTPSA id 4BC641F000C5; Fri, 13 Nov 2026 00:58:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794531488; bh=9KrAdULCzzi+o1kFy+xOWC2+HcJXlxBlTraQzryexnE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=L5VMZD1bBeWBBKyH7KzbMN/ekUzo9lSI24LOdbzOuvH8EhKtd28O1jNpwXQLfJp91 eFHx90apAgYoKbcLWmZNbaDV/1pxmX0uTW7ryujlQ4YiorbWrbgvD2v08Lr0o0KVpA n91kXAqFzaHNB2Wb9YAIEacumZGRAuiwCwN31C1freJKyo80517fhWzvtbzEzyXMgy Ry5+vCXH+DEddiHx78U6RQ01kSUsvSg2ow9BDqRwLbY0kgTT16ce7p6/yymUNCjChq hn2WFvBjbyXo/M01yzm9HY6aDdOnyJSa94jW2dPOfvku3gE20XOC88nJ1+OCSox/B1 UbCnhCd7dQurQ== From: Joel Fernandes To: linux-kernel@vger.kernel.org, "Paul E . McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Davidlohr Bueso Cc: rcu@vger.kernel.org, Kunwu Chan Subject: [PATCH for-v7.5 09/14] rcuscale: Add srcua scale type Date: Thu, 12 Nov 2026 19:57:36 -0500 Message-ID: <20261113005747.2977123-10-jfern@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20261113005747.2977123-1-jfern@kernel.org> References: <20261113005747.2977123-1-jfern@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kunwu Chan Add support for scaling atomic SRCU grace periods using srcu_read_lock_atomic()/srcu_read_unlock_atomic() and synchronize_srcu_atomic(). Suggested-by: Paul E. McKenney Signed-off-by: Kunwu Chan Signed-off-by: Paul E. McKenney Signed-off-by: Joel Fernandes --- kernel/rcu/rcuscale.c | 41 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 40 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c index 41abf05a14d9..687249d686a5 100644 --- a/kernel/rcu/rcuscale.c +++ b/kernel/rcu/rcuscale.c @@ -297,6 +297,44 @@ static struct rcu_scale_ops srcud_ops = { .name = "srcud" }; +static struct srcu_struct srcua; + +static int srcu_scale_atomic_read_lock(void) +{ + return srcu_read_lock_atomic(srcu_ctlp); +} + +static void srcu_scale_atomic_read_unlock(int idx) +{ + srcu_read_unlock_atomic(srcu_ctlp, idx); +} + +static void srcu_scale_atomic_synchronize(void) +{ + synchronize_srcu_atomic(srcu_ctlp); +} + +static void srcu_atomic_scale_init(void) +{ + srcu_ctlp = &srcua; + init_srcu_struct_atomic(srcu_ctlp); +} + +static struct rcu_scale_ops srcua_ops = { + .ptype = SRCU_FLAVOR, + .init = srcu_atomic_scale_init, + .cleanup = srcu_sync_scale_cleanup, + .readlock = srcu_scale_atomic_read_lock, + .readunlock = srcu_scale_atomic_read_unlock, + .get_gp_seq = srcu_scale_completed, + .gp_diff = rcu_seq_diff, + .exp_completed = srcu_scale_completed, + .sync = srcu_scale_atomic_synchronize, + .exp_sync = srcu_scale_atomic_synchronize, + .stats = srcu_scale_stats, + .name = "srcua" +}; + #ifdef CONFIG_TASKS_RCU /* @@ -1100,7 +1138,8 @@ rcu_scale_init(void) long i; long j; static struct rcu_scale_ops *scale_ops[] = { - &rcu_ops, &srcu_ops, &srcud_ops, TASKS_OPS TASKS_RUDE_OPS TASKS_TRACING_OPS + &rcu_ops, &srcu_ops, &srcua_ops, &srcud_ops, + TASKS_OPS TASKS_RUDE_OPS TASKS_TRACING_OPS }; if (!torture_init_begin(scale_type, verbose)) -- 2.54.0