From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B3FB1215075; Thu, 17 Jul 2025 19:19:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752779988; cv=none; b=StSSI2BwIWW8oWZVGC9FJnvLocnWDo9YFIshReXYdVCqggZ6D8vXfQOXA/fiEVPJDn83qCBKaOQsZhWxwc25+DimoPDBJIi+W3qbey4lNH+BJSBFGybxYpqB+bHUetrL6P7Y0AzlvGuky/SDvA8fMCXtP6oMkCoFrK2ctdXLFdQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752779988; c=relaxed/simple; bh=kB9IkGOyhWi8aZQPMVJ3OuNL8CF6gSScMPT2UpGm2IQ=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=VWuPT8aDCC+Qh7HvJbAlPI9hCh5q6UZCqBr/FGMjJ1zKlFcdz92xO7CHjCwnp2rYh5RArncSc16ZhL6QeZqizv4+AhIpzT098XNuu0t5VnnKNZ6ec50KCa0Nld5gV3g5ou/Jku0uVwj+8Ysr/bQiFHX1/q6x7jnsc1gdiCZGvQA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf19.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id E655412C48F; Thu, 17 Jul 2025 19:19:38 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf19.hostedemail.com (Postfix) with ESMTPA id 3D9E520026; Thu, 17 Jul 2025 19:19:35 +0000 (UTC) Date: Thu, 17 Jul 2025 15:19:34 -0400 From: Steven Rostedt To: "Paul E. McKenney" Cc: Mathieu Desnoyers , Sebastian Andrzej Siewior , Boqun Feng , linux-rt-devel@lists.linux.dev, rcu@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Frederic Weisbecker , Joel Fernandes , Josh Triplett , Lai Jiangshan , Masami Hiramatsu , Neeraj Upadhyay , Thomas Gleixner , Uladzislau Rezki , Zqiang , bpf@vger.kernel.org Subject: Re: [PATCH RFC 6/4] srcu: Add guards for SRCU-fast readers Message-ID: <20250717151934.282d8310@batman.local.home> In-Reply-To: <58866d6b-f4d9-4aaf-abce-10ddf526c3ad@paulmck-laptop> References: <29b5c215-7006-4b27-ae12-c983657465e1@efficios.com> <512331d8-fdb4-4dc1-8d9b-34cc35ba48a5@paulmck-laptop> <16dd7f3c-1c0f-4dfd-bfee-4c07ec844b72@paulmck-laptop> <20250716110922.0dadc4ec@batman.local.home> <895b48bd-d51e-4439-b5e0-0cddcc17a142@paulmck-laptop> <58866d6b-f4d9-4aaf-abce-10ddf526c3ad@paulmck-laptop> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: f1i5qzt8ywhfsbut83rigxt5kcatozun X-Rspamd-Server: rspamout03 X-Rspamd-Queue-Id: 3D9E520026 X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX1+ifgrOJiti0sHJLe5OjazXhA7CciV74js= X-HE-Tag: 1752779975-430591 X-HE-Meta: U2FsdGVkX1+5v4+7LXMwBsDkgdgnLIpgKoyNFh+3UmQ965qUU1iKf3Bs59xWgb/laJhfUv1NFr4kINGSQkTItrZLg797vHx5jI3+rkbCit9duD34xgwUT1ZBjueYCuDw04kgfqkF4m9RzZAcKPodliS2aZAZjRfdWaGJ7YeXhvcrXKI2JEFJg/0NfnE7eeuXh+DBedtETAPbCxiVzxpTOD8VKfDciV2uR00x+vOtO0t87CC/WMP30i3pI2VCNAOsK0ZNdOgvJD1muUrSjK46JaQF7dSHYitJdxUHuDaBqXdnkLm3rZZeUg24TuVYxWh6aIb/cHrsLxGQ5Lxs4aGfQs6C1g3YwuenZjgd92+x6a70+U8aG9ObufPpbgVe08eQq8kxCiTkvQ9LKM5DeJgrlqtyAqcNpRHJjq3lDS1OSJaBQBlfRCm3GKS7lLrrqATaAswKow/DICIJYB6qXfRxDw== On Thu, 17 Jul 2025 12:04:46 -0700 "Paul E. McKenney" wrote: > This adds the usual scoped_guard(srcu_fast, &my_srcu) and > guard(srcu_fast)(&my_srcu). > > Suggested-by: Steven Rostedt > Signed-off-by: Paul E. McKenney > Cc: Mathieu Desnoyers > Cc: Sebastian Andrzej Siewior Reviewed-by: Steven Rostedt (Google) -- Steve > --- > srcu.h | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/include/linux/srcu.h b/include/linux/srcu.h > index 0aa2376cca0b1..ada65b58bc4c5 100644 > --- a/include/linux/srcu.h > +++ b/include/linux/srcu.h > @@ -510,6 +510,11 @@ DEFINE_LOCK_GUARD_1(srcu, struct srcu_struct, > srcu_read_unlock(_T->lock, _T->idx), > int idx) > > +DEFINE_LOCK_GUARD_1(srcu_fast, struct srcu_struct, > + _T->scp = srcu_read_lock_fast(_T->lock), > + srcu_read_unlock_fast(_T->lock, _T->scp), > + struct srcu_ctr __percpu *scp) > + > DEFINE_LOCK_GUARD_1(srcu_fast_notrace, struct srcu_struct, > _T->scp = srcu_read_lock_fast_notrace(_T->lock), > srcu_read_unlock_fast_notrace(_T->lock, _T->scp),