linux-kernel - Re: [PATCH 1/2] kernel/{sched,smp}.c: fix static decl prior to struct declaration

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Message-ID: <20090508190409.GA12130@elte.hu>
Date:	Fri, 8 May 2009 21:04:09 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeff Garzik <jeff@...zik.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>, viro@...iv.linux.org.uk,
	Andrew Morton <akpm@...ux-foundation.org>, roland@...hat.com
Subject: Re: [PATCH 1/2] kernel/{sched,smp}.c: fix static decl prior to
	struct declaration


* Jeff Garzik <jeff@...zik.org> wrote:

> According to C99 6.9.2p3, any declaration "static struct foo my_foo;"
> must follow the definition of struct foo.
> 
> Apparently, gcc's lack of warning is a bug.
> 
> Signed-off-by: Jeff Garzik <jgarzik@...hat.com>

good spotting, i'll apply this fix, but:

>   */
>  struct task_group root_task_group;
>  
> -#ifdef CONFIG_FAIR_GROUP_SCHED
> -/* Default task group's sched entity on each cpu */
> -static DEFINE_PER_CPU(struct sched_entity, init_sched_entity);
> -/* Default task group's cfs_rq on each cpu */
> -static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp;
> -#endif /* CONFIG_FAIR_GROUP_SCHED */
> -
> -#ifdef CONFIG_RT_GROUP_SCHED
> -static DEFINE_PER_CPU(struct sched_rt_entity, init_sched_rt_entity);
> -static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp;
> -#endif /* CONFIG_RT_GROUP_SCHED */
> -#else /* !CONFIG_USER_SCHED */
> -#define root_task_group init_task_group
> -#endif /* CONFIG_USER_SCHED */
> -
>  /* task_group_lock serializes add/remove of task groups and also changes to

This block has a visible imbalance of preprocessor directives - 
there's a #else you moved, without moving the outermost #ifdef. My 
guess is that this will go down in a fireball with 
CONFIG_GROUP_SCHED disabled?

	Ingo
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