linux-kernel - Re: [PATCH 1/2 v2] kernel/{sched,smp}.c: fix static decl prior to struct declaration

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Date:	Mon, 11 May 2009 16:06:06 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Ingo Molnar <mingo@...e.hu>
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 v2] kernel/{sched,smp}.c: fix static decl prior to
 struct declaration

Ingo Molnar wrote:
> -tip testing found this build bug:
> 
> kernel/sched.c: In function ‘root_task_group_empty’:
> kernel/sched.c:312: error: ‘root_task_group’ undeclared (first use in this function)
> kernel/sched.c:312: error: (Each undeclared identifier is reported only once
> kernel/sched.c:312: error: for each function it appears in.)
> 
> config attached.

Fixed and resent.

What a rat's nest of ifdefs!  root_task_group is outside 
CONFIG_USER_SCHED, and so I kept that property in patch v3.

However, its definition in kernel/sched.h is conditional on 
CONFIG_USER_SCHED, even though root_task_group_empty() may exist outside 
of CONFIG_USER_SCHED, and root_task_group is referenced vi
CONFIG_FAIR_GROUP_SCHED || CONFIG_RT_GROUP_SCHED.

Starting to wish I had never patched this code in the first place (that 
barb is directed at the code, not you...)

	Jeff



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