linux-kernel - Re: [PATCH v2 2/9] rcu: Mark rcu_dynticks_curr_cpu_in

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Message-ID: <CAEXW_YSddXU++o7xpi-0kzg9GA6UkM5FsnoXjLQ=gAFBjPf=RA@mail.gmail.com>
Date:   Thu, 13 Feb 2020 09:25:08 -0500
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Thomas Glexiner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH v2 2/9] rcu: Mark rcu_dynticks_curr_cpu_in_eqs() inline

On Wed, Feb 12, 2020 at 8:41 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Wed, 12 Feb 2020 17:38:18 -0500
> Joel Fernandes <joel@...lfernandes.org> wrote:
>
> > I think there are ways to turn off function inlining, such as gcc's:
> > -fkeep-inline-functions
> >
> > And just to be sure weird compilers (clang *cough*) don't screw this up,
> > could we make it static inline notrace?
>
> inline is defined as notrace, so not needed.
>
> I did that because of surprises when functions marked as inline
> suddenly became non inlined and traced, which caused issues with
> function tracing (before I finally got recursion protection working).
> But even then, I figured, if something is inlined and gcc actually
> inlines it, it wont be traced. For consistency, if something is marked
> inline, it should not be traced.

Ah I see it, thanks for the clarification Steve! That looks like a
good idea. I withdraw my previous comment.

- Joel