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SubjectRe: [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@oracle.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@oracle.com>
> Acked-by: Sam Ravnborg <sam@ravnborg.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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