linux-kernel - Re: [PATCH] kconfig: Make allnoconfig disable options behind EMBEDDED and EXPERT

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Date:	Tue, 25 Feb 2014 13:09:25 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Dwight Engen <dwight.engen@...cle.com>,
	Eric Paris <eparis@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Slaby <jslaby@...e.cz>,
	Kyungsik Lee <kyungsik.lee@....com>,
	Michal Hocko <mhocko@...e.cz>, Michal Marek <mmarek@...e.cz>,
	Mike Frysinger <vapier@...too.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rob Landley <rob@...dley.net>,
	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	linux-doc@...r.kernel.org, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kconfig: Make allnoconfig disable options behind
 EMBEDDED and EXPERT

On Sun, 23 Feb 2014 18:20:26 -0800 Josh Triplett <josh@...htriplett.org> wrote:

> "make allnoconfig" exists to ease testing of minimal configurations.
> Documentation/SubmitChecklist includes a note to test with allnoconfig.
> This helps catch missing dependencies on common-but-not-required
> functionality, which might otherwise go unnoticed.
> 
> However, allnoconfig still leaves many symbols enabled, because they're
> hidden behind CONFIG_EMBEDDED or CONFIG_EXPERT.  For instance,
> allnoconfig still has CONFIG_PRINTK and CONFIG_BLOCK enabled, so drivers
> don't typically get build-tested with those disabled.
> 
> To address this, introduce a new Kconfig option "allnoconfig_y", used on
> symbols which only exist to hide other symbols.  Set it on
> CONFIG_EMBEDDED (which then selects CONFIG_EXPERT).  allnoconfig will
> then disable all the symbols hidden behind those.

Now look what you've done!

kernel/sched/core.c: In function 'pick_next_task':
kernel/sched/core.c:2613: warning: control reaches end of non-void function

static inline struct task_struct *
pick_next_task(struct rq *rq, struct task_struct *prev)
{
	const struct sched_class *class;
	struct task_struct *p;

	/*
	 * Optimization: we know that if all tasks are in
	 * the fair class we can call that function directly:
	 */
	if (likely(prev->sched_class == &fair_sched_class &&
		   rq->nr_running == rq->cfs.h_nr_running)) {
		p = fair_sched_class.pick_next_task(rq, prev);
		if (likely(p))
			return p;
	}

	for_each_class(class) {
		p = class->pick_next_task(rq, prev);
		if (p)
			return p;
	}

	BUG(); /* the idle class will always have a runnable task */
}

akpm3:/usr/src/25> grep CONFIG_BUG .config
# CONFIG_BUG is not set
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