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

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Date:   Tue, 10 Nov 2020 11:48:33 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Frederic Weisbecker <frederic@...nel.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 11:39:09AM +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.