linux-kernel - Re: [RFC PATCH 4/8] preempt: Introduce CONFIG_PREEMPT

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Date:   Fri, 22 Jan 2021 17:53:43 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>, Mel Gorman <mgorman@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Michal Hocko <mhocko@...e.com>,
        ardb@...nel.org, jpoimboe@...hat.com
Subject: Re: [RFC PATCH 4/8] preempt: Introduce CONFIG_PREEMPT_DYNAMIC

On Mon, Jan 18, 2021 at 03:12:19PM +0100, Frederic Weisbecker wrote:
> +config HAVE_PREEMPT_DYNAMIC
> +	bool
> +	depends on HAVE_STATIC_CALL_INLINE

I think we can relax this to HAVE_STATIC_CALL, using trampolines
shouldn't be too bad, and that would put it in reach of arm64.

> +	depends on GENERIC_ENTRY
> +	help
> +	   Select this if the architecture support boot time preempt setting
> +	   on top of static calls. It is strongly advised to support inline
> +	   static call to avoid any overhead.