On Fri, 2013-08-30 at 11:02 +0100, Jon Medhurst (Tixy) wrote:
> On Thu, 2013-08-29 at 20:16 +0200, Sebastian Hesselbarth wrote:
> > On 08/29/13 15:35, Arnd Bergmann wrote:
> > > On Tuesday 27 August 2013, Sebastian Hesselbarth wrote:
> > >> @@ -422,16 +419,8 @@ void __init v2m_dt_init_early(void)
> > >> pr_warning("vexpress: DT HBI (%x) is not
> > >> matching "
> > >> "hardware (%x)!\n", dt_hbi,
> > >> hbi);
> > >> }
> > >> -}
> > >> -
> > >> -static void __init v2m_dt_timer_init(void)
> > >> -{
> > >> - of_clk_init(NULL);
> > >>
> > >> - clocksource_of_init();
> > >> -
> > >> - versatile_sched_clock_init(vexpress_get_24mhz_clock_base(),
> > >> - 24000000);
> > >> + versatile_sched_clock_init(vexpress_get_24mhz_clock_base(),
> > >> 24000000);
> > >> }
> > >
> > > You are moving versatile_sched_clock_init() ahead of
> > > clocksource_of_init(), which I suspect
> > > won't work. Have you checked this?
> >
> > "Checked" as in "Tested", no I haven't.
> >
> > But non-DT v2m has it in v2m_init_early also, while v2m_sp804_init()
> > is called in v2m_timer_init().
> >
> > That matches the above approach taken for DT v2m where
> > versatile_sched_clock_init() is now called from v2m_dt_init_early()
> > and clocksource_of_init() called from arch-wide .timer_init.
> >
> > get_maintainer.pl did not spit out any additional maintainer except
> > Russell of course. You know someone who can test the above?
>
> After adding of_clk_init(NULL) to time_init() things boot OK for me with
> this patch. However, do we know that sched_clock is never going to get
> read before time_init() has actually started the clock it reads? Are we
> making things more fragile?
The versatile_sched_clock_init() is currently completely independent of
the clocksource infrastructure, so no harm should be done at all by
moving it.
Paweł
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
