linux-kernel - Re: [PATCH RFC v5 3/6] srcu: Add notrace variant of srcu

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Message-ID: <20180501100623.7ebec465@gandalf.local.home>
Date:   Tue, 1 May 2018 10:06:23 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     linux-kernel@...r.kernel.org, Peter Zilstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Glexiner <tglx@...utronix.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Fenguang Wu <fengguang.wu@...el.com>,
        Baohong Liu <baohong.liu@...el.com>,
        Vedang Patel <vedang.patel@...el.com>, kernel-team@...roid.com
Subject: Re: [PATCH RFC v5 3/6] srcu: Add notrace variant of
 srcu_dereference

On Mon, 30 Apr 2018 18:42:01 -0700
Joel Fernandes <joelaf@...gle.com> wrote:

> In this series, we are making lockdep use an rcuidle tracepoint. For
> this reason we need a notrace variant of srcu_dereference since
> otherwise we get lockdep splats since lockdep hooks may not have run
> yet. This patch adds the needed variant.

This change log is rather confusing. Why would lockdep use an rcuidle
tracepoint? I think we need to explain more here.

-- Steve