From patchwork Thu Jun 21 22:32:30 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 10480819 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id ED0B0604D3 for ; Thu, 21 Jun 2018 22:35:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DCC9528E2B for ; Thu, 21 Jun 2018 22:35:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D00C328F2F; Thu, 21 Jun 2018 22:35:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 60EDF28E2B for ; Thu, 21 Jun 2018 22:35:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932899AbeFUWfG (ORCPT ); Thu, 21 Jun 2018 18:35:06 -0400 Received: from mail-pg0-f67.google.com ([74.125.83.67]:37206 "EHLO mail-pg0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933653AbeFUWd1 (ORCPT ); Thu, 21 Jun 2018 18:33:27 -0400 Received: by mail-pg0-f67.google.com with SMTP id r21-v6so2049335pgv.4 for ; Thu, 21 Jun 2018 15:33:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelfernandes.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=0y0Y6HhK02jQ+sXqM8QUkLbOeY++kM/KqedsahzGKIA=; b=v/8DItKsXV1wW/9gmu/fAunqc2r/YfLSr6Bjp6zekC4WMfrSxdkvlOsLk7wIe+Qwsc MP5GOeSSjturX7QIy03de5gl5EN/SBNGHXni+RatgiO3LnJ3iOrKVBLyWNhnYhNUqXF0 K3t5XubQ6r4KNtI+25WviVRgrvhAv60lTlc08= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=0y0Y6HhK02jQ+sXqM8QUkLbOeY++kM/KqedsahzGKIA=; b=hSGSjmwYOnIYrTuoZIf9cCiEoUGtdOWYqMlv1zqeR+nIGiniLLTYhWlsS7kUQbZgQy U9M85NazxfaMoaMJ4fEY1OK2MzCP5pzRLqJ3tqFyE5sUJ1Fmq/z347sd5aVi+/x9EVuJ aPHIFV2VBXytVk6kb3VSOr2R26xKkw3zfZOLBpQ8HHzbhTVceFJE7ke+Cak2wq3VoX2g VZx3ZBJjHv5IsOlcIw2BruVwYZ7rKikVBoUwbxqndvwPXxIrkfTB5HBc3IAEFHMsIlGp XpncQeDNfLAoBBJGoKM0A2t5x83hlTdmOH3FkJU8iu1Gc9sgQ+rWqC0wCPCybN/JU3ee R7sA== X-Gm-Message-State: APt69E3Br2k5749xlCwLMIffvD4HpJPwyj2rqk4+Lgb3PaSogrgM2E1e 9X6zVywnT0ToR7rBZiWVMbAg+g== X-Google-Smtp-Source: ADUXVKIKruIAgTPFb95500ts74p2UehqH73ZRU1FSHV7Nmch0sb+FKNVy4npyBJSq2RKGWjF6l/G+A== X-Received: by 2002:a62:221a:: with SMTP id i26-v6mr29535847pfi.240.1529620406596; Thu, 21 Jun 2018 15:33:26 -0700 (PDT) Received: from joelaf.mtv.corp.google.com ([2620:0:1000:1600:3122:ea9c:d178:eb]) by smtp.gmail.com with ESMTPSA id x19-v6sm11060824pfi.5.2018.06.21.15.33.25 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 21 Jun 2018 15:33:26 -0700 (PDT) From: Joel Fernandes To: linux-kernel@vger.kernel.org Cc: kernel-team@android.com, Paul McKenney , Joel Fernandes , Boqun Feng , Byungchul Park , Erick Reyes , Ingo Molnar , Julia Cartwright , linux-kselftest@vger.kernel.org, Masami Hiramatsu , Mathieu Desnoyers , Namhyung Kim , Peter Zijlstra , Shuah Khan , Steven Rostedt , Thomas Glexiner , Todd Kjos , Tom Zanussi , Will Deacon Subject: [PATCH v9 1/7] srcu: Add notrace variants of srcu_read_{lock, unlock} Date: Thu, 21 Jun 2018 15:32:30 -0700 Message-Id: <20180621223236.211495-2-joel@joelfernandes.org> X-Mailer: git-send-email 2.18.0.rc2.346.g013aa6912e-goog In-Reply-To: <20180621223236.211495-1-joel@joelfernandes.org> References: <20180621223236.211495-1-joel@joelfernandes.org> Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Paul McKenney This is needed for a future tracepoint patch that uses srcu, and to make sure it doesn't call into lockdep. tracepoint code already calls notrace variants for rcu_read_lock_sched so this patch does the same for srcu which will be used in a later patch. Keeps it consistent with rcu-sched. [Joel: Added commit message] Reviewed-by: Steven Rostedt (VMware) Signed-off-by: Paul McKenney Signed-off-by: Joel Fernandes (Google) --- include/linux/srcu.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/srcu.h b/include/linux/srcu.h index 91494d7e8e41..3e72a291c401 100644 --- a/include/linux/srcu.h +++ b/include/linux/srcu.h @@ -195,6 +195,16 @@ static inline int srcu_read_lock(struct srcu_struct *sp) __acquires(sp) return retval; } +/* Used by tracing, cannot be traced and cannot invoke lockdep. */ +static inline notrace int +srcu_read_lock_notrace(struct srcu_struct *sp) __acquires(sp) +{ + int retval; + + retval = __srcu_read_lock(sp); + return retval; +} + /** * srcu_read_unlock - unregister a old reader from an SRCU-protected structure. * @sp: srcu_struct in which to unregister the old reader. @@ -209,6 +219,13 @@ static inline void srcu_read_unlock(struct srcu_struct *sp, int idx) __srcu_read_unlock(sp, idx); } +/* Used by tracing, cannot be traced and cannot call lockdep. */ +static inline notrace void +srcu_read_unlock_notrace(struct srcu_struct *sp, int idx) __releases(sp) +{ + __srcu_read_unlock(sp, idx); +} + /** * smp_mb__after_srcu_read_unlock - ensure full ordering after srcu_read_unlock *