linux-kernel - Re: [PATCH] rcu: fix section mismatch

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Message-Id: <20080121153409.7511407e.randy.dunlap@oracle.com>
Date:	Mon, 21 Jan 2008 15:34:09 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	lkml <linux-kernel@...r.kernel.org>, dipankar@...ibm.com,
	akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH] rcu: fix section mismatch

On Mon, 21 Jan 2008 11:38:38 +1100 Rusty Russell wrote:

> On Sunday 20 January 2008 08:25:49 Sam Ravnborg wrote:
> > On Sat, Jan 19, 2008 at 11:56:43AM -0800, Randy Dunlap wrote:
> > > rcu_online_cpu() should be __cpuinit instead of __devinit.
> >
> > So if we have:
> > CONFIG_HOTPLUG=n
> > CONFIG_HOTPLUG_CPU=y
> >
> > then this is a oops candidate.
> 
> At first glance, this can't happen because all CONFIG_HOTPLUG_CPU depends on 
> CONFIG_HOTPLUG or selects it, for all archs.

Mostly, but arch/mips/ seems to be different (neither depends nor selects)
unless it has changed very recently (I looked at 2.6.24-rc8).

> But CONFIG_PM_SLEEP_SMP selects CONFIG_HOTPLUG_CPU, without requiring 
> CONFIG_HOTPLUG: turning on SUSPEND or HIBERNATION does this.
> 
> Perhaps it's time to revisit reverse-depends for select?

It would be nice if someone did that.

---
~Randy
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