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

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Message-ID: <20200212204128.20f5e8ba@oasis.local.home>
Date:   Wed, 12 Feb 2020 20:41:28 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        mingo@...nel.org, gregkh@...uxfoundation.org,
        gustavo@...eddedor.com, tglx@...utronix.de, paulmck@...nel.org,
        josh@...htriplett.org, mathieu.desnoyers@...icios.com,
        jiangshanlai@...il.com
Subject: Re: [PATCH v2 2/9] rcu: Mark rcu_dynticks_curr_cpu_in_eqs() inline

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.

-- Steve