linux-kernel - Re: [PATCH 6/7] sched/rt: make it configurable

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Date:   Tue, 30 May 2017 10:41:15 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 6/7] sched/rt: make it configurable

On Mon, May 29, 2017 at 05:03:01PM -0400, Nicolas Pitre wrote:

> @@ -1303,8 +1303,17 @@ config SCHED_AUTOGROUP
>  	  desktop applications.  Task group autogeneration is currently based
>  	  upon task session.
>  
> +config SCHED_RT
> +	bool "Real Time Task Scheduling" if EXPERT
> +	default y
> +	help
> +	  This adds the sched_rt scheduling class to the kernel providing
> + 	  support for the SCHED_FIFO and SCHED_RR policies. You might want
> +	  to disable this to reduce the kernel size. If unsure say y.
> +
>  config SCHED_DL
>  	bool "Deadline Task Scheduling" if EXPERT
> +	depends on SCHED_RT
>  	default y
>  	help
>  	  This adds the sched_dl scheduling class to the kernel providing
> @@ -1632,6 +1641,7 @@ config BASE_FULL
>  config FUTEX
>  	bool "Enable futex support" if EXPERT
>  	default y
> +	depends on SCHED_RT
>  	select RT_MUTEXES
>  	help
>  	  Disabling this option will cause the kernel to be built without

Aside from all the other completely non-starter #ifdeffery trainwrecks,
this is just plain wrong.