linux-kernel - Re: [PATCH -rcu/kcsan 04/23] kcsan: Add core support for a subset of weak memory modeling

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Date:   Tue, 5 Oct 2021 16:20:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marco Elver <elver@...gle.com>
Cc:     "Paul E . McKenney" <paulmck@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Ingo Molnar <mingo@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Waiman Long <longman@...hat.com>,
        Will Deacon <will@...nel.org>, kasan-dev@...glegroups.com,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, x86@...nel.org
Subject: Re: [PATCH -rcu/kcsan 04/23] kcsan: Add core support for a subset of
 weak memory modeling

On Tue, Oct 05, 2021 at 03:13:25PM +0200, Marco Elver wrote:
> On Tue, 5 Oct 2021 at 14:53, Peter Zijlstra <peterz@...radead.org> wrote:

> > And since you want to mark these functions as uaccess_safe, there must
> > not be any tracing on, hence notrace.
> 
> In the Makefile we've relied on:
> 
>   CFLAGS_REMOVE_core.o = $(CC_FLAGS_FTRACE)
> 
> just to disable it for all code here. That should be enough, right?

I find these implicit notrace thingies terribly confusing :/ I've
reported fail to rostedt a number of times only to be (re)told about
these Makefile level thingies.

Ideally we'd script notrace on every implicit symbol or something.