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 X-Spam-Level: X-Spam-Status: No, score=-7.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AF1E9C4360F for ; Wed, 27 Mar 2019 03:21:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D4DA2146E for ; Wed, 27 Mar 2019 03:21:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553656880; bh=wWJZg7hFW30nvHrRJ3216p8dXbFyJgzZYr2WaKsfWww=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=vS10Wy7F1uIV62hcetoDWYmYbGMb3DTq2KDcW6RH4VLuYWwwpaGnAY9w4rToT8o/N 2U2NdS9VgWMiUVIUQiMuLYaOMayl3jefkB1Da/e67Vp5dRNBkGXQFlU45wXILuvp8h MbNXzssY2sIbfpM+SYGBZLp/Yfef9Yhwla8ZFTPE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732832AbfC0DVT (ORCPT ); Tue, 26 Mar 2019 23:21:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:59030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727452AbfC0DVS (ORCPT ); Tue, 26 Mar 2019 23:21:18 -0400 Received: from devbox (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 608422087E; Wed, 27 Mar 2019 03:21:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553656877; bh=wWJZg7hFW30nvHrRJ3216p8dXbFyJgzZYr2WaKsfWww=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=H+rKWIw9ZGBwzg0IY8jynL0h37sz7beRWOAWspESzJagiFaHiWAHgUP3LsCDvb2Fd MhUlUk+l9qTyGG8+g1WoR4L5nUMM7DBsOffnFmipE+b8CF+qKQ27NqdyJOLkzhBacT ERbzzNL94IXHIqgqzovfuPQhuDHo139COOHGziA8= Date: Wed, 27 Mar 2019 12:21:12 +0900 From: Masami Hiramatsu To: "Paul E. McKenney" Cc: rcu@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, "Naveen N. Rao" , Anil S Keshavamurthy , "David S. Miller" , Masami Hiramatsu , Jonathan Corbet , linux-doc@vger.kernel.org Subject: Re: [PATCH tip/core/rcu 1/2] doc/kprobes: Update obsolete RCU update functions Message-Id: <20190327122112.1993060d4b8500125adf9c2d@kernel.org> In-Reply-To: <20190326230050.16840-1-paulmck@linux.ibm.com> References: <20190326230011.GA16275@linux.ibm.com> <20190326230050.16840-1-paulmck@linux.ibm.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 26 Mar 2019 16:00:49 -0700 "Paul E. McKenney" wrote: > The RCU flavors have been consolidated, so this commit replaces mentions > of the now-obsolete synchronize_sched() function with synchronize_rcu(). Thank you for updating! Acked-by: Masami Hiramatsu > > Signed-off-by: Paul E. McKenney > Cc: "Naveen N. Rao" > Cc: Anil S Keshavamurthy > Cc: "David S. Miller" > Cc: Masami Hiramatsu > Cc: Jonathan Corbet > Cc: > --- > Documentation/kprobes.txt | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt > index 10f4499e677c..ee60e519438a 100644 > --- a/Documentation/kprobes.txt > +++ b/Documentation/kprobes.txt > @@ -243,10 +243,10 @@ Optimization > ^^^^^^^^^^^^ > > The Kprobe-optimizer doesn't insert the jump instruction immediately; > -rather, it calls synchronize_sched() for safety first, because it's > +rather, it calls synchronize_rcu() for safety first, because it's > possible for a CPU to be interrupted in the middle of executing the > -optimized region [3]_. As you know, synchronize_sched() can ensure > -that all interruptions that were active when synchronize_sched() > +optimized region [3]_. As you know, synchronize_rcu() can ensure > +that all interruptions that were active when synchronize_rcu() > was called are done, but only if CONFIG_PREEMPT=n. So, this version > of kprobe optimization supports only kernels with CONFIG_PREEMPT=n [4]_. > > -- > 2.17.1 > -- Masami Hiramatsu