linux-kernel - Re: [PATCH 03/21] ARM: shmobile: don't call irqchip

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Date:	Tue, 30 Apr 2013 10:58:40 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Bastian Hecht <hechtb+renesas@...il.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Subject: Re: [PATCH 03/21] ARM: shmobile: don't call irqchip_init
 unconditionally

On Mon, Apr 29, 2013 at 04:49:07PM +0200, Arnd Bergmann wrote:
> On Friday 26 April 2013, Simon Horman wrote:
> > > diff --git a/arch/arm/mach-shmobile/intc-r8a7740.c b/arch/arm/mach-shmobile/intc-r8a7740.c
> > > index 8871f77..5dc57f1 100644
> > > --- a/arch/arm/mach-shmobile/intc-r8a7740.c
> > > +++ b/arch/arm/mach-shmobile/intc-r8a7740.c
> > > @@ -53,14 +53,23 @@ static void __init r8a7740_init_irq_common(void)
> > >  
> > >  void __init r8a7740_init_irq_of(void)
> > >  {
> > > +     if (!IS_ENABLED(CONFIG_OF))
> > > +             return;
> > > +
> > 
> > In other parts of the shmobile I believe that such code is
> > guarded by #ifdef CONFIG_OF and I believe not guarding this code in
> > some way was an oversight.
> > 
> > The above change seems fine to me.
> 
> Ok. The change that broke the code is only present in linux-next from
> one of your trees, but is not in arm-soc. Could you include the change
> in your tree, either by folding into one of your patches or adapting
> my patch appropriately?

Yes, or of course. I'll queue-up your patch with
the second hunk (below) removed.

> > > +
> > > +     gic_dist_base = ioremap_nocache(0xc2800000, 0x1000);
> > > +     gic_cpu_base = ioremap_nocache(0xc2000000, 0x1000);
> > >  
> > >       /* initialize the Generic Interrupt Controller PL390 r0p0 */
> > >       gic_init(0, 29, gic_dist_base, gic_cpu_base);
> > 
> > This one seems broken as the armadillo800eva board currently uses
> > it to initialise GIC even if CONFIG_ATAGS is not defined.
> > 
> > I did test the above change on the armadillo800eva board
> > with the above change and CONFIG_ATAGS disabled, the result was
> > a boot failure. With the change reverted booting seems fine.
> 
> Yes, I see my mistake now. The second change was clearly wrong
> as this function is also used for DT boards, not for ATAGS boards.
> 
> 	Arnd
> 
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