linux-kernel - Re: [RFC PATCH 4/7] preempt/dynamic: Provide cond_resched() and might

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Date:   Mon, 18 Jan 2021 14:58:14 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de>,
        Michal Hocko <mhocko@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Michal Hocko <mhocko@...e.com>
Subject: Re: [RFC PATCH 4/7] preempt/dynamic: Provide cond_resched() and
 might_resched() static calls

On Tue, Nov 10, 2020 at 11:48:33AM +0100, Peter Zijlstra wrote:
> On Tue, Nov 10, 2020 at 11:39:09AM +0100, Peter Zijlstra wrote:
> > Subject: static_call: EXPORT_STATIC_CALL_TRAMP()
> > From: Peter Zijlstra <peterz@...radead.org>
> > Date: Tue Nov 10 11:37:48 CET 2020
> > 
> > For when we want to allow modules to call the static_call() but not
> > change it.
> > 
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > ---
> > @@ -269,6 +281,9 @@ static inline int static_call_text_reser
> >  	return 0;
> >  }
> >  
> > +#define EXPORT_STATIC_CALL_TRAMP(name)
> > +#define EXPORT_STATIC_CALL_TRAMP_GPL(name)
> > +
> >  #define EXPORT_STATIC_CALL(name)	EXPORT_SYMBOL(STATIC_CALL_KEY(name))
> >  #define EXPORT_STATIC_CALL_GPL(name)	EXPORT_SYMBOL_GPL(STATIC_CALL_KEY(name))
> 
> Hurmph, this hunk is wrong, it should export the KEY in both cases :/
> 
> That's unfortunate but unavoidable I suppose.

Right, AFAICT static_call() refers to both key and tramp in any case.