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

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Message-ID: <20080119213831.GF29070@uranus.ravnborg.org>
Date:	Sat, 19 Jan 2008 22:38:31 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, tglx <tglx@...utronix.de>,
	akpm <akpm@...ux-foundation.org>, johannes@...solutions.net
Subject: Re: [PATCH] hrtimer: fix section mismatch

On Sat, Jan 19, 2008 at 10:31:46PM +0100, Sam Ravnborg wrote:
> On Sat, Jan 19, 2008 at 11:57:10AM -0800, Randy Dunlap wrote:
> > From: Randy Dunlap <randy.dunlap@...cle.com>
> > 
> > Fix section mismatch in hrtimer.c:
> > 
> > WARNING: vmlinux.o(.text+0x50c61): Section mismatch: reference to .init.text: (between 'hrtimer_cpu_notify' and 'down_read_trylock')
> > 
> > Noticed by Johannes Berg and confirmed by Sam Ravnborg.
> > 
> > Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
> Acked-by: Sam Ravnborg <sam@...nborg.org>

And looking at bit closer this looks like a 2.6.24 candidate.
With:
CONFIG_HOTPLUG=n
CONFIG_HOTPLUG_CPU=y

then we may see a call to init_hrtimers_cpu() from hrtimer_cpu_notify()
in the:
      case CPU_UP_PREPARE:
      case CPU_UP_PREPARE_FROZEN:
cases.

And this will oops.

[It these a cases will be hit I dunno - I just follow the
logic of the code here.]

	Sam

> 
> > ---
> >  kernel/hrtimer.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > --- linux-2.6.24-rc8-git2.orig/kernel/hrtimer.c
> > +++ linux-2.6.24-rc8-git2/kernel/hrtimer.c
> > @@ -1378,7 +1378,7 @@ sys_nanosleep(struct timespec __user *rq
> >  /*
> >   * Functions related to boot-time initialization:
> >   */
> > -static void __devinit init_hrtimers_cpu(int cpu)
> > +static void __cpuinit init_hrtimers_cpu(int cpu)
> >  {
> >  	struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
> >  	int i;
> > --
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